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| KSZ8993M/ML Integrated 3-Port 10/100 Managed Switch with PHYs Rev 1.06 General Description The KSZ8993M, a highly integrated Layer 2 managed switch, is designed for low port count, cost-sensitive 10/100 Mbps switch systems. It offers an extensive feature set that includes tag/port-based VLAN, quality of service (QoS) priority, management, management information base (MIB) counters, MII/SNI, and CPU control/data interfaces to effectively address both current and emerging Fast Ethernet applications. The KSZ8993M contains two 10/100 transceivers with patented mixed-signal low-power technology, three media access control (MAC) units, a highspeed non-blocking switch fabric, a dedicated address lookup engine, and an on-chip frame buffer memory. Both PHY units support 10BASE-T and 100BASETX. In addition, one of the PHY unit supports 100BASE-FX. The KSZ8993ML is the single supply version with all the identical rich features of the KSZ8993M. ___________________________________________________________________________________________________ Functional Diagram Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com October 2008 1 M9999-020606 Micrel, Inc. KSZ8993M/ML 1KLook-Up Engine AUTO MDI/MDI-X 10/100 T/TX/FX PHY 1 10/100 MAC1 Queue Manageme nt FIF O,Flow Control, VLANTagging,Priority AUTO MDI/MDI-X 10/100 T/TX PHY 2 10/100 MAC2 Buffer Manageme nt MII/SNI 10/100 MAC3 Frame Buffers SNI SPI SPI MIB Counters MIIM SMI I2C P1 LED[3:0] P2 LED[3:0] Control Registers EEP ROM Interface LED Drivers Strap-In Configuration Pins Features * Proven Integrated 3-Port 10/100 Ethernet Switch - 2nd generation switch with three MACs and two PHYs fully compliant to IEEE 802.3u standard - Non-blocking switch fabric assures fast packet delivery by utilizing a 1K MAC address lookup table and a store-and-forward architecture - Full duplex IEEE 802.3x flow control (pause) with force mode option - Half-duplex back pressure flow control - Automatic MDI/MDI-X crossover with disable and enable option - 100BASE-FX support on port 1 - MII interface supports both MAC mode and PHY mode - 7-wire serial network interface (SNI) support for legacy MAC - Comprehensive LED Indicator support for link, activity, full/half duplex and 10/100 speed * Comprehensive Configuration Register Access - Serial management interface (SMI) to all internal registers - MII management (MIIM) interface to PHY registers - SPI and I2C Interface to all internal registers - I/0 Pins strapping and EEPROM to program selective registers in unmanaged switch mode - Control registers configurable on the fly (portpriority, 802.1p/d/q, AN...) * QoS/CoS Packet Prioritization Support - Per port, 802.1p and DiffServ-based - Re-mapping of 802.1p priority field per port basis * Advanced Switch Features - IEEE 802.1q VLAN support for up to 16 groups (full-range of VLAN ID) - VLAN ID tag/untag options, per port basis - IEEE 802.1p/q tag insertion or removal on a per port basis (egress) - Programmable rate limiting from 0Mbps to 100Mbps at the ingress and egress port, rate options for high and low priority per port basis - Broadcast storm protection with % control (global and per port basis) - IEEE 802.1d spanning tree protocol support - Upstream special tagging mode to inform the processor which ingress port receives the packet - IGMP v1/v2 snooping support for multicast packet filtering - Double-tagging support October 2008 2 M9999-020606 Micrel, Inc. KSZ8993M/ML * Switch Management Features - Port mirroring/monitoring/sniffing: ingress and/or egress traffic to any port or MII - MIB counters for fully compliant statistics gathering, 34 MIB counters per port - Loopback modes for remote diagnostic of failure * Low Power Dissipation: <0.8 Watts (includes PHY transmit drivers) - Full-chip hardware power-down (register configuration not saved) - Per port based software power-save on PHY (idle link detection, register configuration preserved) - 0.18um CMOS technology - Voltages: Core 1.8V I/O and Transceiver 3.3V Use K8993ML for 3.3V only operation * Available in128-Pin PQFP Applications * Universal Solutions - Broadband gateway / Firewall / VPN - Integrated DSL or cable modem multi-port router - Wireless LAN access point + gateway - Residential and enterprise VoIP gateway/phone - Set-top/game box - Home networking expansion - Standalone 10/100 switch - FTTx customer premises equipment - Fiber broadband gateway * Upgradeable Solutions(1) - Unmanaged switch with future option to migrate to a managed solution - Single PHY alternative with future expansion option for two ports * Industrial Solutions - Applications requiring port redundancy and port monitoring - Sensor devices in redundant ring topology Note: 1. The cost and time of PCB re-spin. October 2008 3 M9999-020606 Micrel, Inc. KSZ8993M/ML Ordering Information Part Number Pb-Free KSZ8993M KSZ8993ML KSZ8993MI KSZ8993MLI Standard KS8993M KS8993ML KS8993MI KS8993MLI Temperature Range 0oC to 70oC 0 C to 70 C -40 C to +85 C -40oC to +85oC o o o o Package 128-Pin PQFP, Lead-free 128-Pin PQFP, Lead-free 128-Pin PQFP, Lead-free 128-Pin PQFP, Lead-free October 2008 4 M9999-020606 Micrel, Inc. KSZ8993M/ML Revision History Revision 1.00 1.01 1.02 Date 5/14/03 5/28/03 12/8/03 Summary of Changes Created. Added KS8993MI availability in Q4 2003. Changed VDDIO, VDDATX and VDDARX supply voltages from 3.3V to (3.3V or 2.5V). Changed [PS1,PS0] = [1,1] setting from Reserved to SMI mode. Changed Special Tagging Mode to Upstream Special Tagging Mode (Switch port 3 to processor support only). Updated recommended magnetic manufacturer list. Added 25MHz crystal/oscillator clock's ppm spec. in Pin Description. 2 Updated I C Slave Serial Bus Configuration section. Updated KSZ8993MI availability to from Q1 2004. Added KS8993ML to General Description (page 1) and to the Functional Description. Updated Part Ordering Information table. Updated pin description for pin 22 to the following: VDDC: For KS8993M, this is an input power pin for the 1.8V digital core VDD. VOUT_1V8: For KS8993ML, this is an 1.8V output power pin to supply the KS8993ML's input power pins: VDDAP (pin 63), VDDC (pins 91, 123), and VDDA (pins 38, 43, 57). Updated pin description for P1LED3 (pin 25) to indicate that an external 1K pull-down is needed if a LED is connected. Updated pin description for MDIO (pin 95) to indicate that an external 4.7K pull-up is needed if this pin is in used. Changed the aging period from 300 +/-75 seconds to about 200 seconds. Updated Electrical Characteristics (VIH, VIL, VOH, VOL). Transferred to new format. Removed references to 2.5V operation Added reset circuit recommendation Updated to add Pb-Free spwcifications Add the P/N KSZ8993I into the Ordering information table Add the P/N KSZ8993MLI into the Ordering information table Modify the current consumption table from board to device. 1.03 9/22/04 1.04 1.05 1.06 1.06a 4/12/05 2/14/05 2/13/07 10/28/08 October 2008 5 M9999-020606 Micrel, Inc. KSZ8993M/ML Contents List of Figures .........................................................................................................................................9 List of Tables...........................................................................................................................................9 Pin Description and I/O Assignment...................................................................................................10 Pin Configuration..................................................................................................................................20 Functional Description .........................................................................................................................21 Functional Overview: Physical Layer Transceiver ............................................................................21 100BASE-TX Transmit.........................................................................................................................................................21 100BASE-TX Receive ..........................................................................................................................................................21 PLL Clock Synthesizer........................................................................................................................................................22 Scrambler/De-scrambler (100BASE-TX Only) ...................................................................................................................22 100BASE-FX Operation.......................................................................................................................................................22 100BASE-FX Signal Detection............................................................................................................................................22 100BASE-FX Far End Fault.................................................................................................................................................22 10BASE-T Transmit .............................................................................................................................................................23 10BASE-T Receive ..............................................................................................................................................................23 Power Management.............................................................................................................................................................23 MDI /MDI-X Auto Crossover................................................................................................................................................23 Straight Cable ................................................................................................................................................................23 Crossover Cable ............................................................................................................................................................25 Auto Negotiation .................................................................................................................................................................25 Functional Overview: MAC and Switch ..............................................................................................27 Address Lookup ..................................................................................................................................................................27 Learning ...............................................................................................................................................................................27 Migration ..............................................................................................................................................................................27 Aging ....................................................................................................................................................................................27 Forwarding...........................................................................................................................................................................27 Switching Engine ................................................................................................................................................................30 MAC Operation ....................................................................................................................................................................30 Inter Packet Gap (IPG) ..................................................................................................................................................30 Back-Off Algorithm.........................................................................................................................................................30 Late Collision .................................................................................................................................................................30 Illegal Frames ................................................................................................................................................................30 Flow Control...................................................................................................................................................................30 Half-Duplex Backpressure .............................................................................................................................................30 Broadcast Storm Protection ...........................................................................................................................................31 MII Interface Operation........................................................................................................................................................31 SNI (7-Wire) Operation ........................................................................................................................................................32 MII Management Interface (MIIM) .......................................................................................................................................32 Serial Management Interface (SMI) ....................................................................................................................................33 Advanced Switch Functions ................................................................................................................34 Spanning Tree Support.......................................................................................................................................................34 Upstream Special Tagging Mode .......................................................................................................................................35 IGMP Support ......................................................................................................................................................................36 "IGMP" Snooping ...........................................................................................................................................................36 "Multicast Address Insertion" in the Static MAC Table...................................................................................................36 Port Mirroring Support........................................................................................................................................................36 IEEE 802.1Q VLAN Support ................................................................................................................................................36 QoS Priority Support...........................................................................................................................................................37 Rate Limiting Support .........................................................................................................................................................39 Configuration Interface .......................................................................................................................................................39 I2C Master Serial Bus Configuration ..............................................................................................................................39 I2C Slave Serial Bus Configuration ................................................................................................................................40 SPI Slave Serial Bus Configuration ...............................................................................................................................40 Loopback Support...............................................................................................................................................................44 MII Management (MIIM) Registers .......................................................................................................45 October 2008 6 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 0: MII Basic Control..........................................................................................................................................46 Register 1: MII Basic Status ...........................................................................................................................................46 Register 2: PHYID HIGH ................................................................................................................................................46 Register 3: PHYID LOW.................................................................................................................................................46 Register 4: Auto-Negotiation Advertisement Ability ........................................................................................................47 Register 5: Auto-Negotiation Link Partner Ability ...........................................................................................................47 Register Map: Switch & PHY (8 bit registers).....................................................................................48 Global Registers.............................................................................................................................................................48 Port Registers ................................................................................................................................................................48 Advanced Control Registers...........................................................................................................................................48 Global Registers..................................................................................................................................................................48 Register 0 (0x00): Chip ID0............................................................................................................................................48 Register 1 (0x01): Chip ID1 / Start Switch......................................................................................................................49 Register 2 (0x02): Global Control 0 ................................................................................................................................49 Register 3 (0x03): Global Control 1 ................................................................................................................................50 Register 4 (0x04): Global Control 2 ................................................................................................................................50 Register 5 (0x05): Global Control 3 ................................................................................................................................51 Register 6 (0x06): Global Control 4 ................................................................................................................................52 Register 7 (0x07): Global Control 5 ................................................................................................................................53 Register 8 (0x08): Global Control 6 ................................................................................................................................53 Register 9 (0x09): Global Control 7 ................................................................................................................................53 Register 10 (0x0A): Global Control 8..............................................................................................................................53 Register 11 (0x0B): Global Control 9..............................................................................................................................53 Register 12 (0x0C): Reserved Register..........................................................................................................................54 Register 13 (0x0D): User Defined Register 1 .................................................................................................................54 Register 14 (0x0E): User Defined Register 2 .................................................................................................................54 Register 15 (0x0F): User Defined Register 3 .................................................................................................................54 Port Registers......................................................................................................................................................................55 Register 16 (0x10): Port 1 Control 0...............................................................................................................................55 Register 32 (0x20): Port 2 Control 0...............................................................................................................................55 Register 48 (0x30): Port 3 Control 0...............................................................................................................................55 Register 17 (0x11): Port 1 Control 1...............................................................................................................................56 Register 33 (0x21): Port 2 Control 1...............................................................................................................................56 Register 49 (0x31): Port 3 Control 1...............................................................................................................................56 Register 18 (0x12): Port 1 Control 2...............................................................................................................................57 Register 34 (0x22): Port 2 Control 2...............................................................................................................................57 Register 50 (0x32): Port 3 Control 2...............................................................................................................................57 Register 19 (0x13): Port 1 Control 3...............................................................................................................................57 Register 35 (0x23): Port 2 Control 3...............................................................................................................................57 Register 51 (0x33): Port 3 Control 3...............................................................................................................................57 Register 20 (0x14): Port 1 Control 4...............................................................................................................................58 Register 36 (0x24): Port 2 Control 4...............................................................................................................................58 Register 52 (0x34): Port 3 Control 4...............................................................................................................................58 Register 21 (0x15): Port 1 Control 5...............................................................................................................................58 Register 37 (0x25): Port 2 Control 5...............................................................................................................................58 Register 53 (0x35): Port 3 Control 5...............................................................................................................................58 Register 22 (0x16): Port 1 Control 6...............................................................................................................................58 Register 38 (0x26): Port 2 Control 6...............................................................................................................................58 Register 54 (0x36): Port 3 Control 6...............................................................................................................................58 Register 23 (0x17): Port 1 Control 7...............................................................................................................................58 Register 39 (0x27): Port 2 Control 7...............................................................................................................................58 Register 55 (0x37): Port 3 Control 7...............................................................................................................................58 Register 24 (0x18): Port 1 Control 8...............................................................................................................................58 Register 40 (0x28): Port 2 Control 8...............................................................................................................................58 Register 56 (0x38): Port 3 Control 8...............................................................................................................................58 Register 25 (0x19): Port 1 Control 9...............................................................................................................................59 Register 41 (0x29): Port 2 Control 9...............................................................................................................................59 Register 57 (0x39): Port 3 Control 9...............................................................................................................................59 Register 26 (0x1A): Port 1 Control 10 ............................................................................................................................59 Register 42 (0x2A): Port 2 Control 10 ............................................................................................................................59 Register 58 (0x3A): Port 3 Control 10 ............................................................................................................................59 Register 27 (0x1B): Port 1 Control 11 ............................................................................................................................59 October 2008 7 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 43 (0x2B): Port 2 Control 11 ............................................................................................................................59 Register 59 (0x3B): Port 3 Control 11 ............................................................................................................................59 Register 28 (0x1C): Port 1 Control 12 ............................................................................................................................60 Register 44 (0x2C): Port 2 Control 12 ............................................................................................................................60 Register 60 (0x3C): Reserved, not applied to port 3 ......................................................................................................60 Register 29 (0x1D): Port 1 Control 13 ............................................................................................................................61 Register 45 (0x2D): Port 2 Control 13 ............................................................................................................................61 Register 61 (0x3D): Reserved, not applied to port 3 ......................................................................................................61 Register 30 (0x1E): Port 1 Status 0................................................................................................................................62 Register 46 (0x2E): Port 2 Status 0................................................................................................................................62 Register 62 (0x3E): Reserved, not applied to port 3 ......................................................................................................62 Register 31 (0x1F): Port 1 Status 1 ................................................................................................................................63 Register 47 (0x2F): Port 2 Status 1 ................................................................................................................................63 Register 63 (0x3F): Port 3 Status 1 ................................................................................................................................63 Advanced Control Registers ..............................................................................................................................................64 Register 96 (0x60): TOS Priority Control Register 0.......................................................................................................64 Register 97 (0x61): TOS Priority Control Register 1.......................................................................................................64 Register 98 (0x62): TOS Priority Control Register 2.......................................................................................................64 Register 99 (0x63): TOS Priority Control Register 3.......................................................................................................64 Register 100 (0x64): TOS Priority Control Register 4.....................................................................................................64 Register 101 (0x65): TOS Priority Control Register 5.....................................................................................................64 Register 102 (0x66): TOS Priority Control Register 6.....................................................................................................64 Register 103 (0x67): TOS Priority Control Register 7.....................................................................................................64 Register 104 (0x68): MAC Address Register 0 ..............................................................................................................65 Register 105 (0x69): MAC Address Register 1 ..............................................................................................................65 Register 106 (0x6A): MAC Address Register 2 ..............................................................................................................65 Register 107 (0x6B): MAC Address Register 3 ..............................................................................................................65 Register 108 (0x6C): MAC Address Register 4..............................................................................................................65 Register 109 (0X6D): MAC Address Register 5 .............................................................................................................65 Register 110 (0x6E): Indirect Access Control 0..............................................................................................................66 Register 111 (0x6F): Indirect Access Control 1..............................................................................................................66 Register 112 (0x70): Indirect Data Register 8 ................................................................................................................66 Register 113 (0x71): Indirect Data Register 7 ................................................................................................................66 Register 114 (0x72): Indirect Data Register 6 ................................................................................................................66 Register 115 (0x73): Indirect Data Register 5 ................................................................................................................66 Register 116 (0x74): Indirect Data Register 4 ................................................................................................................66 Register 117 (0x75): Indirect Data Register 3 ................................................................................................................67 Register 118 (0x76): Indirect Data Register 2 ................................................................................................................67 Register 119 (0x77): Indirect Data Register 1 ................................................................................................................67 Register 120 (0x78): Indirect Data Register 0 ................................................................................................................67 Registers 121 to 127 ......................................................................................................................................................67 Static MAC Address Table .............................................................................................................................................67 VLAN Table....................................................................................................................................................................68 Dynamic MAC Address Table ........................................................................................................................................69 MIB (Management Information Base) Counters .............................................................................................................70 Additional Information.....................................................................................................................................................73 Absolute Maximum Ratings.................................................................................................................74 Operating Ratings.................................................................................................................................74 Electrical Characteristics .....................................................................................................................75 Timing Specifications...........................................................................................................................77 EEPROM Timing ..................................................................................................................................................................77 SNI Timing............................................................................................................................................................................78 MII Timing.................................................................................................................................................78 MAC Mode MII Timing....................................................................................................................................................79 PHY-Mode MII Timing ....................................................................................................................................................80 SPI Timing.................................................................................................................................................78 Input Timing ...................................................................................................................................................................81 Output Timing.................................................................................................................................................................82 Reset Timing........................................................................................................................................................................83 Selection of Isolation Transformers....................................................................................................85 Selection of Reference Crystal ............................................................................................................85 October 2008 8 M9999-020606 Micrel, Inc. KSZ8993M/ML Package Information.............................................................................................................................86 List of Figures Figure 1. Typical Straight Cable Connection .......................................................................................................................................25 Figure 2. Typical Crossover Cable Connection ...................................................................................................................................25 Figure 3. Auto Negotiation and Parallel Operation .............................................................................................................................26 Figure 4. Destination Address Lookup Flow Chart, Stage 1 ..............................................................................................................27 Figure 5. Destination Address Resolution Flow Chart, Stage 2 ........................................................................................................28 Figure 6. 802.1p Priority Field Format ..................................................................................................................................................37 Figure 7. KSZ8993M EEPROM Configuration Timing Diagram..........................................................................................................38 Figure 8. SPI Write Data Cycle...............................................................................................................................................................42 Figure 9. SPI Read Data Cycle ...............................................................................................................................................................42 Figure 10. SPI Multiple Write..................................................................................................................................................................42 Figure 11. SPI Multiple Read..................................................................................................................................................................43 Figure 12. Loopback Path ......................................................................................................................................................................44 Figure 13. EEPROM Interface Input Timing Diagram ..........................................................................................................................76 Figure 14. EEPROM Interface Output Timing Diagram .......................................................................................................................76 Figure 15. SNI Input Timing Diagram....................................................................................................................................................77 Figure 16. SNI Output Timing Diagram.................................................................................................................................................77 Figure 17. MAC-Mode MII Timing - Data Received from MII ..............................................................................................................79 Figure 18. MAC-Mode MII Timing - Data Input to MII ..........................................................................................................................78 Figure 19. PHY-Mode MII Timing - Data Received from MII ...............................................................................................................79 Figure 20. PHY-Mode MII Timing - Data Input to MII...........................................................................................................................79 Figure 21. SPI Input Timing....................................................................................................................................................................81 Figure 22. SPI Output Timing.................................................................................................................................................................82 Figure 23. Reset Timing .........................................................................................................................................................................83 128-Pin PQFP Package...........................................................................................................................................................................86 List of Tables Table 1. FX and TX Mode Selection ......................................................................................................................................................22 Table 2. MDI/MDI-X Pin Definitions........................................................................................................................................................23 Table 3. MII Signals .................................................................................................................................................................................31 Table 4. SNI Signals ................................................................................................................................................................................32 Table 5. MII Management Interface Frame Format ..............................................................................................................................33 Table 6. Serial Management Interface (SMI) Frame Format................................................................................................................33 Table 7. Upstream Special Tagging Mode Format ..............................................................................................................................35 Table 8. STPID Egress Rules (Switch Port 3 to Processor)................................................................................................................35 Table 9. FID+DA Lookup in VLAN Mode ...............................................................................................................................................37 Table 10. FID+SA Lookup in VLAN Mode .............................................................................................................................................37 Table 11. KSZ8993M SPI Connections..................................................................................................................................................41 Table 12. Format of Static MAC Table (8 Entries)................................................................................................................................67 Table 13. Format of Static VLAN Table (16 Entries) ............................................................................................................................69 Table 14. Format of Dynamic MAC Address Table (1K Entries) ........................................................................................................69 Table 15. Format of "Per Port" MIB Counters......................................................................................................................................70 Table 16. Port 1s "Per Port" MIB Counters Indirect Memory Offsets................................................................................................71 Table 17. Port 1's "Per Port" MIB Counters Indirect Memory Offsets...............................................................................................72 Table 18. Format of "All Port Dropped Packet" MIB Counters ..........................................................................................................72 Table 19. "All Port Dropped Packet" MIB Counters Indirect Memory Offsets .................................................................................72 Table 20. EEPROM Timing Parameters ................................................................................................................................................77 Table 21. SNI Timing Parameters ..........................................................................................................................................................78 Table 22. MAC-Mode MII Timing Parameters .......................................................................................................................................79 Table 23. PHY-Mode MII Timing Parameters ........................................................................................................................................80 Table 24. SPI Input Timing Parameters ................................................................................................................................................81 Table 25. SPI Output Timing Parameters .............................................................................................................................................82 Table 26. Reset Timing Parameters ......................................................................................................................................................83 Table 27. Transformer Selection Criteria..............................................................................................................................................85 Table 28. Qualified Single Port Magnetics ...........................................................................................................................................85 Table 29. Typical Reference Crystal Characteristics ..........................................................................................................................85 October 2008 9 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Description and I/O Assignment Pin Number 1 2 3 Pin Name P1LED2 P1LED1 P1LED0 Type (1) Ipu/O Ipu/O Ipu/O P1LED3 P1LED2 P1LED1 P1LED0 Description Port 1 LED indicators [LEDSEL1, LEDSEL0] [0, 0] -- Link/Act Full duplex/Col Speed [0, 1] -- 100Link/Act 10Link/Act Full duplex [LEDSEL1, LEDSEL0] [1, 0] P1LED3 P1LED2 P1LED1 P1LED0 Act Link Full duplex/Col Speed [1, 1] -- -- -- -- Notes: LEDSEL0 is external strap-in pin 70. LEDSEL1 is external strap-in pin 23. P1LED3 is pin 25. During reset, P1LED[2:0] are inputs for internal testing. 4 5 6 P2LED2 P2LED1 P2LED0 Ipu/O Ipu/O Ipu/O P2LED3 P2LED2 P2LED1 P2LED0 Port 2 LED indicators [LEDSEL1, LEDSEL0] [0, 0] -- Link/Act Full duplex/Col Speed [0, 1] -- 100Link/Act 10Link/Act Full duplex [LEDSEL1, LEDSEL0] [1, 0] P2LED3 P2LED2 P2LED1 P2LED0 Act Link Full duplex/Col Speed [1, 1] -- -- -- -- Notes: LEDSEL0 is external strap-in pin 70. LEDSEL1 is external strap-in pin 23. P2LED3 is pin 20. During reset, P2LED[2:0] are inputs for internal testing. 7 Note: 1. Ipu/O = Input with internal pull-up during reset, output pin otherwise. Gnd = Ground. DGND Gnd Digital ground October 2008 10 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Number 8 9 10 11 12 Pin Name VDDIO NC NC NC ADVFC Type (1) P Ipd Ipd Ipu Ipu Description 3.3V digital VDD No connect No connect No connect 1 = advertise the switch's flow control capability via auto negotiation. 0 = will not advertise the switch's flow control capability via auto negotiation. 13 14 15 P2ANEN P2SPD P2DPX Ipu Ipd Ipd 1 = enable auto negotiation on port 2 0 = disable auto negotiation on port 2 1 = force port 2 to 100BT if P2ANEN = 0 0 = force port 2 to 10BT if P2ANEN = 0 1 = port 2 default to full duplex mode if P2ANEN = 1 and auto negotiation fails. Force port 2 in full duplex mode if P2ANEN = 0. 0 = port 2 default to half duplex mode if P2ANEN = 1 and auto negotiation fails. Force port 2 in half duplex mode if P2ANEN = 0. 16 P2FFC Ipd 1 = always enable (force) port 2 flow control feature 0 = port 2 flow control feature enable is determined by auto negotiation result. 17 18 19 20 NC NC NC P2LED3 Opu Ipd Ipd Opd No connect No connect No connect Port 2 LED indicator Note: Internal pull-down is weak; it will not turn ON the LED. See description in pin 4. 21 22 DGND VDDC/VOUT_1 V8 Gnd P Digital ground VDDC: For KSZ8993M, this is an input power pin for the 1.8V digital core VDD. VOUT_1V8: For KSZ8993ML, this is a 1.8V output power pin to supply the KSZ8993ML's input power pins: VDDAP (pin 63), VDDC (pins 91 and 123), and VDDA (pins 38, 43, and 57). 23 24 25 LEDSEL1 NC P1LED3 Ipd O Opd LED display mode select See description in pins 1 and 4. No connect Port 1 LED indicator Note: An external 1K pull-down is needed on this pin if it is connected to a LED. The 1K resistor will not turn ON the LED. See description in pin 1. Note: 1. P = Power supply. Gnd = Ground. O = Output. Ipu = Input w/ internal pull-up. Ipd = Input w/ internal pull-down. Opu = Output with internal pull-up. Opd = Output internal pull-down. October 2008 11 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Number 26 27 Pin Name NC HWPOVR Type (1) O Ipd Description No connect Hardware pin overwrite 0 = Disable. All strap-in pins configurations are overwritten by the EEPROM configuration data 1 = Enable. All strap-in pins configurations are overwritten by the EEPROM configuration data, except for register 0x2C bits [7:5], (port 2: auto-negotiation enable, force speed, force duplex). 28 P2MDIXDIS Ipd Port 2 Auto MDI/MDI-X PD (default) = enable PU = disable 29 P2MDIX Ipd Port 2 MDI/MDI-X setting when auto MDI/MDI-X is disabled. PD (default) = MDI-X (transmit on TXP2 / TXM2 pins) PU = MDI, (transmit on RXP2 / RXM2 pins) 30 31 32 P1ANEN P1SPD P1DPX Ipu Ipd Ipd 1 = enable auto negotiation on port 1 0 = disable auto negotiation on port 1 1 = force port 1 to 100BT if P1ANEN = 0 0 = force port 1 to 10BT if P1ANEN = 0 1 = port 1 default to full duplex mode if P1ANEN = 1 and auto negotiation fails. Force port 1 in full-duplex mode if P1ANEN = 0. 0 = port 1 default to half duplex mode if P1ANEN = 1 and auto negotiation fails. Force port 1 in half duplex mode if P1ANEN = 0. 33 P1FFC Ipd 1 = always enable (force) port 1 flow control feature 0 = port 1 flow control feature enable is determined by auto negotiation result. 34 35 36 37 38 39 40 41 42 43 44 Note: 1. P = Power supply. Gnd = Ground. I = Input. O = Output. NC NC PWRDN AGND VDDA AGND MUX1 MUX2 AGND VDDA FXSD1 Ipd Ipd Ipu Gnd P Gnd I I Gnd P I No connect No connect Chip power-down input (active low) Analog ground 1.8V analog VDD Analog ground Factory test pin - float for normal operation Factory test pin - float for normal operation Analog ground 1.8V analog VDD Fiber signal detect/factory test pin Ipu = Input w/ internal pull-up. Ipd = Input w/ internal pull-down. October 2008 12 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Number 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 Pin Name RXP1 RXM1 AGND TXP1 TXM1 VDDATX VDDARX RXM2 RXP2 AGND TXM2 TXP2 VDDA AGND TEST1 TEST2 ISET AGND VDDAP AGND X1 X2 Type (1) I/O I/O Gnd I/O I/O P P I/O I/O Gnd I/O I/O P Gnd I Ipu O Gnd P Gnd I O Description Physical receive or transmit signal (+ differential) Physical receive or transmit signal (- differential) Analog ground Physical transmit or receive signal (+ differential) Physical transmit or receive signal (- differential) 3.3V analog VDD 3.3V analog VDD Physical receive or transmit signal (- differential) Physical receive or transmit signal (+ differential) Analog ground. Physical transmit or receive signal (- differential) Physical transmit or receive signal (+ differential) 1.8 analog VDD Analog ground Factory test pin - float for normal operation Factory test pin - float or pull-up for normal operation Set physical transmit output current. Pull-down this pin with a 3.01K 1% resistor to ground. Analog ground 1.8V analog VDD for PLL Analog ground. 25MHz crystal/oscillator clock connections Pins (X1, X2) connect to a crystal. If an oscillator is used, X1 connects to a 3.3V tolerant oscillator and X2 is a no connect. Note: Clock is +/- 50ppm for both crystal and oscillator. Hardware reset pin (active low) Half-duplex backpressure 1 = enable 0 = disable 67 68 RST_N BPEN Ipu Ipd 69 SMAC Ipd Special Mac-mode In this mode, the switch will do faster back-offs than normal. 1 = enable 0 = disable Note: 1. P = Power supply. Gnd = Ground. I = Input. O = Output. Ipu = Input w/ internal pull-up. Ipd = Input w/ internal pull-down. October 2008 13 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Number 70 71 72 73 74 75 76 77 Pin Name LEDSEL0 SMTXEN SMTXD3 SMTXD2 SMTXD1 SMTXD0 SMTXER SMTXC Type (1) Ipd Ipd Ipd Ipd Ipd Ipd Ipd Ipd/O Description LED display mode select See description in pins 1 and 4. Switch MII transmit enable Switch MII transmit data bit 3 Switch MII transmit data bit 2 Switch MII transmit data bit 1 Switch MII transmit data bit 0 Switch MII transmit error Switch MII transmit clock Output in PHY MII mode Input in MAC MII mode 78 79 80 DGND VDDIO SMRXC Gnd P Ipd/O Digital ground 3.3V digital VDD Switch MII receive clock. Output in PHY MII mode Input in MAC MII mode 81 82 SMRXDV SMRXD3 O Ipd/O Switch MII receive data valid Switch MII receive data bit 3 Strap option: switch MII full-duplex flow control PD (default) = disable PU = enable 83 SMRXD2 Ipd/O Switch MII receive bit 2 Strap option: switch MII is in PD (default) = full-duplex mode PU = half-duplex mode 84 SMRXD1 Ipd/O Switch MII receive bit 1 Strap option: Switch MII is in PD (default) = 100Mbps mode PU = 10Mbps mode 85 SMRXD0 Ipd/O Switch MII receive bit 0 Strap option: switch will accept packet size up to PD (default) = 1536 bytes (inclusive) PU = 1522 bytes (tagged), 1518 bytes (untagged) 86 87 Note: 1. P = Power supply. Gnd = Ground. O = Output. SCOL SCRS Ipd/O Ipd/O Switch MII collision detect Switch MII carrier sense Ipd = Input w/ internal pull-down. Ipd/O = Input w/ internal pull-down during reset, output pin otherwise. October 2008 14 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Number 88 89 Pin Name SCONF1 SCONF0 Type (1) Ipd Ipd Description Switch MII interface configuration (SCONF1, SCONF0) (0,0) (0,1) (1,0) (1,1) Description disable, outputs tri-stated PHY mode MII MAC mode MII PHY mode SNI 90 91 92 93 DGND VDDC PRSEL1 PRSEL0 Gnd P Ipd Ipd Digital ground 1.8V digital VDD Priority select. Select queue servicing if using split queues. Use the table below to select the desired servicing. Note that this selection effects all split transmit queue ports in the same way. (PRSEL1, PRSEL0) (0,0) (0,1) (1,0) (1,1) Description Transmit all high priority before low priority Transmit high priority and low priority at 10:1 ratio. Transmit high priority and low priority at 5:1 ratio. Transmit high priority and low priority at 2:1 ratio. 94 95 MDC MDIO Ipu Ipu/O MII management interface: clock input MII management interface: data input/output Note: an external 4.7K pull-up is needed on this pin when it is in use. 96 97 SPIQ SCL Opu Ipu/O SPI slave mode: serial data output See description in pins 100 and 101. SPI slave mode / I C slave mode: clock input I2C master mode: clock output See description in pins 100 and 101. 2 98 SDA Ipu/O SPI slave mode: serial data input I2C master/slave mode: serial data input/output See description in pins 100 and 101. 99 SPIS_N Ipu SPI slave mode: chip select (active low) When SPIS_N is high, the KSZ8993M is deselected and SPIQ is held in high impedance state. A high-to-low transition is used to initiate SPI data transfer. See description in pins 100 and 101. Note: 1. P = Power supply. Gnd = Ground. Ipu = Input w/ internal pull-up. Ipd = Input w/ internal pull-down. Ipu/O = Input w/ internal pull-up during reset, output pin otherwise. Opu = Output w/ internal pull-up. October 2008 15 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Number 100 101 Pin Name PS1 PS0 Type (1) Ipd Ipd Description Serial bus configuration pins to select mode of access to KSZ8993M internal registers. [PS1, PS0] = [0, 0] -- I2C master (EEPROM) mode (If EEPROM is not detected, the power-up default values of the KSZ8993M internal registers will be used.) Interface Signals SPIQ SCL SDA SPIS_N Type O O I/O Ipu Description Not used (tri-stated) I C clock I C data I/O Not used 2 2 [PS1, PS0] = [0, 1] -- I2C slave mode 2 The external I C master will drive the SCL clock. The KSZ8993M device addresses are: 1011_1111 1011_1110 SPIQ SCL SDA SPIS_N Type O I I/O Ipu Description Not used (tri-stated) I C clock I C data I/O Not used 2 2 Interface Signals [PS1, PS0] = [1, 0] -- SPI slave mode Interface Signals SPIQ SCL SDA SPIS_N Type O I I Ipu Description SPI data out SPI clock SPI data In SPI chip select [PS1, PS0] = [1, 1] - SMI-mode In this mode, the KSZ8993M provides access to all its internal 8 bit registers through its MDC and MDIO pins. Note: When (PS1, PS0) (1,1), the KSZ8993M provides access to its 16 bit MIIM registers through its MDC and MDIO pins. 102 103 PV31 PV32 Ipu Ipu Port 3 port-based VLAN mask bits - Use to select which ports may transmit packets received on port 3. PV31 = 1, port 1 may transmit packets received on port 3 PV31 = 0, port 1 will not transmit any packets received on port 3 PV32 = 1, port 2 may transmit packets received on port 3 PV32 = 0, port 2 will not transmit any packets received on port 3 Note: 1. I = Input. O= Output. Ipu = Input w/ internal pull-up. Ipd = Input w/ internal pull-down. I/O = Bi-directional. October 2008 16 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Number 104 105 Pin Name PV21 PV23 Type (1) Ipu Ipu Description Port 2 port-based VLAN mask bits - Use to select which ports may transmit packets received on port 2. PV21 = 1, port 1 may transmit packets received on port 2 PV21 = 0, port 1 will not transmit any packets received on port 2 PV23 = 1, port 3 may transmit packets received on port 2 PV23 = 0, port 3 will not transmit any packets received on port 2 106 107 108 109 DGND VDDIO PV12 PV13 Gnd P Ipu Ipu Digital ground 3.3V digital VDD Port 1 port-based VLAN mask bits - Use to select which ports may transmit packets received on port 1. PV12 = 1, port 2 may transmit packets received on port 1 PV12 = 0, port 2 will not transmit any packets received on port 1 PV13 = 1, port 3 may transmit packets received on port 1 PV13 = 0, port 3 will not transmit any packets received on port 1 110 P3_1PEN Ipd Enable 802.1p priority classification on port 3 ingress 1 = enable 0 = disable Enable is from the receive perspective. If 802.1p processing is disabled or there is no tag, priority is determined by the P3_PP pin. 111 P2_1PEN Ipd Enable 802.1p priority classification on port 2 ingress 1 = enable 0 = disable Enable is from the receive perspective. If 802.1p processing is disabled or there is no tag, priority is determined by the P2_PP pin. 112 P1_1PEN Ipd Enable 802.1p priority classification on port 1 ingress 1 = enable 0 = disable Enable is from the receive perspective. If 802.1p processing is disabled or there is no tag, priority is determined by the P1_PP pin. 113 P3_TXQ2 Ipd Select transmit queue split on port 3 1 = split 0 = no split The split sets up high and low priority queues. Packet priority classification is done on ingress ports, via port-based, 802.1p or TOS based scheme. The priority enabled queuing on port 3 is set by P3_TXQ2. Note: 1. P = Power supply. Gnd = Ground. Ipu = Input w/ internal pull-up. Ipd = Input w/ internal pull-down. October 2008 17 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Number 114 Pin Name P2_TXQ2 Type (1) Ipd Description Select transmit queue split on port 2 1 = split 0 = no split The split sets up high and low priority queues. Packet priority classification is done on ingress ports, via port-based, 802.1p or TOS based scheme. The priority enabled queuing on port 2 is set by P2_TXQ2. 115 P1_TXQ2 Ipd Select transmit queue split on port 1 1 = split 0 = no split The split sets up high and low priority queues. Packet priority classification is done on ingress ports, via port-based, 802.1p or TOS based scheme. The priority enabled queuing on port 1 is set by P1_TXQ2. 116 P3_PP Ipd Select port-based priority on port 3 ingress 1 = high 0 = low 117 P2_PP Ipd Select port-based priority on port 2 ingress 1 = high 0 = low 118 P1_PP Ipd Select port-based priority on port 1 ingress 1 = high 0 = low 119 P3_TAGINS Ipd Enable tag insertion on port 3 egress 1 = enable 0 = disable All packets transmitted from port 3 will have 802.1Q tag. Packets received with tag will be sent out intact. Packets received without tag will be tagged with ingress port's default tag. 120 P2_TAGINS Ipd Enable tag insertion on port 2 egress 1 = enable 0 = disable All packets transmitted from port 2 will have 802.1Q tag. Packets received with tag will be sent out intact. Packets received without tag will be tagged with ingress port's default tag. Note: 1. Ipd = Input w/ internal pull-down. October 2008 18 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Number 121 Pin Name P1_TAGINS Type (1) Ipd Description Enable tag insertion on port 1 egress 1 = enable 0 = disable All packets transmitted from port 1 will have 802.1Q tag. Packets received with tag will be sent out intact. Packets received without tag will be tagged with ingress port's default tag. 122 123 124 DGND VDDC P3_TAGRM Gnd P Ipd Digital ground 1.8V digital VDD Enable tag removal on port 3 egress 1 = enable 0 = disable All packets transmitted from port 3 will not have 802.1Q tag. Packets received with tag will be modified by removing 802.1Q tag. Packets received without tag will be sent out intact. 125 P2_TAGRM Ipd Enable tag removal on port 2 egress 1 = enable 0 = disable All packets transmitted from port 2 will not have 802.1Q tag. Packets received with tag will be modified by removing 802.1Q tag. Packets received without tag will be sent out intact. 126 P1_TAGRM Ipd Enable tag removal on port 1 egress 1 = enable 0 = disable All packets transmitted from port 1 will not have 802.1Q tag. Packets received with tag will be modified by removing 802.1Q tag. Packets received without tag will be sent out intact. 127 128 Note: 1. P = Power supply. Gnd = Ground. TESTEN SCANEN Ipd Ipd Scan Test Enable For normal operation, pull-down this pin to ground. Scan Test Scan Mux Enable For normal operation, pull-down this pin to ground. Ipd = Input w/ internal pull-down. October 2008 19 M9999-020606 Micrel, Inc. KSZ8993M/ML Pin Configuration PV31 PS0 PS1 SPIS_N SDA SCL SPIQ MDIO MDC PRSEL0 PRSEL1 VDDC DGND SCONF0 SCONF1 SCRS SCOL SMRXD0 SMRXD1 SMRXD2 SMRXD3 SMRXDV SMRXC VDDIO DGND SMTXC SMTXER SMTXD0 SMTXD1 SMTXD2 SMTXD3 SMTXEN LEDSEL0 SMAC BPEN RST_N X2 X1 PV32 PV21 PV23 DGND VDDIO PV12 PV13 P3_1PEN P2_1PEN P1_1PEN P3_TXQ2 P2_TXQ2 P1_TXQ2 P3_PP P2_PP P1_PP P3_TAGINS P2_TAGINS P1_TAGINS DGND VDDC P3_TAGRM P2_TAGRM P1_TAGRM TESTEN SCANEN AGND VDDAP AGND ISET TEST2 TEST1 AGND VDDA TXP2 TXM2 AGND RXP2 RXM2 VDDARX VDDATX TXM1 TXP1 AGND RXM1 RXP1 FXSD1 VDDA AGND MUX2 MUX1 AGND October 2008 P1LED2 P1LED1 P1LED0 P2LED2 P2LED1 P2LED0 DGND VDDIO NC NC NC ADVFC P2ANEN P2SPD P2DPX P3FFC NC NC NC P2LED3 DGND VDDC LEDSEL1 NC P1LED3 NC HWPOVR P2MDIXDIS P2MDIX P1ANEN P1SPD P1DPX P1FFC NC NC PWRDN AGND VDDA 128-Pin PQFP (Top View) 20 M9999-020606 Micrel, Inc. KSZ8993M/ML Functional Description The KSZ8993M contains two 10/100 physical layer transceivers and three MAC units with an integrated Layer 2 managed switch. The KSZ8993M has the flexibility to reside in either a managed or unmanaged design. In a managed design, the host processor has complete control of the KSZ8993M via the SMI interface, MIIM interface, SPI bus, or I2C bus. An unmanaged design is achieved through I/O strapping and/or EEPROM programming at system reset time. On the media side, the KSZ8993M supports IEEE 802.3 10BASE-T and 100BASE-TX on both PHY ports, and 100BASE-FX on PHY port 1. The KSZ8993M can be used as a media converter. The KSZ8993ML is the single supply version with all the identical rich features of the KSZ8993M. In the KSZ8993ML version, pin number 22 provides 1.8V output power to the KSZ8993ML's VDDC, VDDA, and VDDAP power pins. Refer to the Pin Description table for information about pin 22 (Pin Description and I/0 Assignment). Physical signal transmission and reception are enhanced through the use of patented analog circuitries that make the design more efficient and allow for lower power consumption and smaller chip die size. Functional Overview: Physical Layer Transceiver 100BASE-TX Transmit The 100BASE-TX transmit function performs parallel to serial conversion, 4B/5B coding, scrambling, NRZ to NRZI conversion, MLT3 encoding and transmission. The circuit starts with a parallel-to-serial conversion, which converts the MII data from the MAC into a 125MHz serial bit stream. The data and control stream is then converted into 4B/5B coding and followed by a scrambler. The serialized data is further converted from NRZ to NRZI format, and then transmitted in MLT3 current output. The output current is set by an external 1% 3.01 K resistor for the 1:1 transformer ratio. It has a typical rise/fall time of 4ns and complies with the ANSI TP-PMD standard regarding amplitude balance, overshoot, and timing jitter. The wave-shaped 10BASE-T output is also incorporated into the 100BASE-TX transmitter. 100BASE-TX Receive The 100BASE-TX receiver function performs adaptive equalization, DC restoration, MLT3 to NRZI conversion, data and clock recovery, NRZI to NRZ conversion, de-scrambling, 4B/5B decoding and serial-to-parallel conversion. The receiving side starts with the equalization filter to compensate for inter-symbol interference (ISI) over the twisted pair cable. Since the amplitude loss and phase distortion is a function of the length of the cable, the equalizer has to adjust its characteristics to optimize the performance. In this design, the variable equalizer will make an initial estimation based on comparisons of incoming signal strength against some known cable characteristics, then it tunes itself for optimization. This is an ongoing process and can self adjust against environmental changes such as temperature variations. The equalized signal then goes through a DC restoration and data conversion block. The DC restoration circuit is used to compensate for the effect of base line wander and improve the dynamic range. The differential data conversion circuit converts the MLT3 format back to NRZI. The slicing threshold is also adaptive. The clock recovery circuit extracts the 125MHz clock from the edges of the NRZI signal. This recovered clock is then used to convert the NRZI signal into the NRZ format. The signal is then sent through the de-scrambler followed by the 4B/5B decoder. Finally, the NRZ serial data is converted to the MII format and provided as the input data to the MAC. October 2008 21 M9999-020606 Micrel, Inc. KSZ8993M/ML PLL Clock Synthesizer The KSZ8993M generates 125MHz, 31.25MHz, 25MHz, and 10MHz clocks for system timing. Internal clocks are generated from an external 25MHz crystal or oscillator. Scrambler/De-scrambler (100BASE-TX Only) The purpose of the scrambler is to spread the power spectrum of the signal in order to reduce EMI and baseline wander. Transmitted data is scrambled through the use of an 11-bit wide linear feedback shift register (LFSR). The scrambler can generate a 2047-bit non-repetitive sequence. The receiver will then de-scramble the incoming data stream with the same sequence at the transmitter. 100BASE-FX Operation 100BASE-FX operation is very similar to 100BASE-TX operation with the differences being that the scrambler / de-scrambler and MLT3 encoder / decoder are bypassed on transmission and reception. In 100BASE-FX mode, the auto negotiation feature is bypassed since there is no standard that supports fiber auto negotiation. The autoMDI/MDI-X feature is also disabled. 100BASE-FX Signal Detection In fiber operation, the KSZ8993M's FXSD1 (fiber signal detect) input pin is usually connected to the fiber transceiver's SD (signal detect) output pin. 100BASE-FX mode is activated when the FXSD1 input pin is greater than 1V. When FXSD1 is between 1V and 1.8V, no fiber signal is detected and a far end fault (FEF) is generated. When FXSD1 is over 2.2V, the fiber signal is detected. Alternatively, the designer may choose not to implement the FEF feature. In this case, the FXSD1 input pin is tied high to force 100BASE-FX mode. 100BASE-FX signal detection is summarized in the following table: Part Number Less than 0.2V Greater than 1V, but less than 1.8V Mode TX mode FX mode No signal detected. Far-end fault generated Greater than 2.2V I FX mode Signal detected Table 1. FX and TX Mode Selection To ensure proper operation, a resistive voltage divider is recommended to adjust the fiber transceiver's SD output voltage swing to match the KSZ8993M's FXSD1 input voltage threshold. 100BASE-FX Far End Fault An FEF occurs when the signal detection is logically false on the receive side of the fiber transceiver. The KSZ8993M detects a FEF when its FXSD1 input is between 1.0V and 1.8V. When an FEF occurs, the transmission side signals the other end of the link by sending 84 1's followed by a zero in the idle period between frames. Upon receiving an FEF, the LINK will go down (even when a fiber signal is detected) to indicate a fault condition. The transmitting side is not affected when an FEF is received, and will continue to send out its normal transmit pattern from the MAC. By default, FEF is enabled. The FEF feature can be disabled through register setting. October 2008 22 M9999-020606 Micrel, Inc. KSZ8993M/ML 10BASE-T Transmit The output 10BASE-T driver is incorporated into the 100BASE-T driver to allow transmission with the same magnetic. They are internally wave-shaped and pre-emphasized into outputs with a typical 2.3V amplitude. The harmonic contents are at least 27dB below the fundamental when driven by an all-ones Manchester-encoded signal. 10BASE-T Receive On the receive side, input buffers and level detecting squelch circuits are employed. A differential input receiver circuit and a PLL perform the decoding function. The Manchester-encoded data stream is separated into clock signal and NRZ data. A squelch circuit rejects signals with levels less than 400 mV or with short pulse widths in order to prevent noises at the RXP or RXM input from falsely triggering the decoder. When the input exceeds the squelch limit, the PLL locks onto the incoming signal and the KSZ8993M decodes a data frame. The receiver clock is maintained active during idle periods in between data reception. Power Management The KSZ8993M features a per-port power down mode. To save power, the user can power down ports that are not in use by setting the port control registers, or MII control registers. In addition, there is a full chip power down mode. When activated, the entire chip will be shut down. MDI /MDI-X Auto Crossover The KSZ8993M supports MDI/ DI-X auto crossover. This facilitates the use of either a straight connection CAT-5 cable or a crossover CAT-5 cable. The auto-sense function will detect remote transmit and receive pairs, and correctly assign the transmit and receive pairs from the KSZ8993M device. This feature can be extremely useful when end users are unaware of cable types and can also save on an additional uplink configuration connection. The auto-crossover feature can be disabled through the port control registers. Based on the IEEE 802.3 standard, the MDI and MDI-X definitions are as follows: MDI RJ45 Pins 1 2 3 6 Signals TD+ TDRD+ RDRJ-45 Pins 1 2 3 6 MDI-X Signals RD+ RDTD+ TD- Table 2. MDI/MDI-X Pin Definitions October 2008 23 M9999-020606 Micrel, Inc. KSZ8993M/ML Straight Cable A straight cable connects an MDI device to an MDI-X device, or an MDI-X device to an MDI device. The following diagram depicts a typical straight cable connection between a NIC card (MDI) and a switch, or hub (MDI-X). 10/100 Ethernet Media Dependent Interface 10/100 Ethernet Media Dependent Interface 1 Transmit Pair 2 3 4 Receive Pair 5 6 7 8 Straight Cable 1 Receive Pair 2 3 4 Transmit Pair 5 6 7 8 Modular Connector (RJ-45) NIC Modular Connector (RJ-45) HUB (Repeater or Switch) Figure 1. Typical Straight Cable Connection October 2008 24 M9999-020606 Micrel, Inc. KSZ8993M/ML Crossover Cable A crossover cable connects an MDI device to another MDI device, or an MDI-X device to another MDI-X device. The following diagram shows a typical crossover cable connection between two switches or hubs (two MDI-X devices). 10/100 Ethernet Media Dependent Interface 10/100 Ethernet Media Dependent Interface 1 Receive Pair 2 3 4 Transmit Pair 5 6 7 8 Crossover Cable 1 Receive Pair 2 3 4 Transmit Pair 5 6 7 8 Modular Connector (RJ-45) HUB (Repeater or Switch) Modular Connector (RJ-45) HUB (Repeater or Switch) Figure 2. Typical Crossover Cable Connection Auto Negotiation The KSZ8993M conforms to the auto negotiation protocol as described by the 802.3 committee. Auto negotiation allows unshielded twisted pair (UTP) link partners to select the best common mode of operation. In auto negotiation, the link partners advertise capabilities across the link to each other. If auto negotiation is not supported or the link partner to the KSZ8993M is forced to bypass auto negotiation, then the mode is set by observing the signal at the receiver. This is known as parallel mode because while the transmitter is sending auto negotiation advertisements, the receiver is listening for advertisements or a fixed signal protocol. The link setup is shown in the following flow diagram. October 2008 25 M9999-020606 Micrel, Inc. KSZ8993M/ML Start Auto Negotiation Force Link Setting N o Parallel Operation Ye s Bypass Auto Negotiation and Set Link Mode Attempt Auto Negotiation Listen for 100BASE-TX Idles Listen for 10BASE-T Link Pulses No Join Flow Link Mode Set ? Yes Link Mode Set Figure 3. Auto Negotiation and Parallel Operation October 2008 26 M9999-020606 Micrel, Inc. KSZ8993M/ML Functional Overview: MAC and Switch Address Lookup The internal lookup table stores MAC addresses and their associated information. It contains a 1K uni-cast address table plus switching information. The KSZ8993M is guaranteed to learn 1K addresses and distinguishes itself from hash-based lookup tables, which depending on the operating environment and probabilities, may not guarantee the absolute number of addresses that can be learned. Learning The internal lookup engine will update its table with a new entry if the following conditions are met: 1. The received packet's SA does not exist in the lookup table. 2. The received packet is good; the packet has no receiving errors, and is of legal length. The lookup engine will insert the qualified SA into the table, along with the port number and time stamp. If the table is full, the last entry of the table will be deleted to make room for the new entry. Migration The internal lookup engine also monitors whether a station has moved. If so, it will update the table accordingly. Migration happens when the following conditions are met: 1. The received packet's SA is in the table but the associated source port information is different. 2. The received packet is good; the packet has no receiving errors, and is of legal length. The lookup engine will update the existing record in the table with the new source port information. Aging The lookup engine will update the time stamp information of a record whenever the corresponding SA appears. The time stamp is used in the aging process. If a record is not updated for a period of time, the lookup engine will remove the record from the table. The lookup engine constantly performs the aging process and will continuously remove aging records. The aging period is about 200 seconds. This feature can be enabled or disabled through Global Register 3 (0x03). Forwarding The KSZ8993M will forward packets using the algorithm that is depicted in the following flowcharts. Figure 4 shows stage one of the forwarding algorithm where the search engine looks up the VLAN ID, static table, and dynamic table for the destination address, and comes up with "port to forward 1" (PTF1). PTF1 is then further modified by spanning tree, IGMP snooping, port mirroring, and port VLA processes to come up with "port to forward 2" (PTF2), as shown in Figure 5. The packet is sent to PTF2. October 2008 27 M9999-020606 Micrel, Inc. KSZ8993M/ML Start PTF1= NULL NO VLAN ID Valid? - Search VLAN table - Ingress VLAN filtering - Discard NPVID check YES Search complete. Get PTF1 from Static MAC Table FOUND Search Static Table This search is based on DA or DA+FID NOT FOUND Search complete. Get PTF1 from Dynamic MAC Table FOUND Dynamic Table Search This search is based on DA+FID NOT FOUND Search complete. Get PTF1 from VLAN Table PTF1 Figure 4. Destination Address Lookup Flow Chart, Stage 1 October 2008 28 M9999-020606 Micrel, Inc. KSZ8993M/ML PTF1 Spanning Tree Process - Check receiving port's receive enable bit - Check destination port's transmit enable bit - Check whether packets are special (BPDU or specified) IGMP Process - Applied to MAC #1 and MAC #2 - MAC #3 is reserved for microprocessor - IGMP will be forwarded to port 3 Port Mirror Process - RX Mirror - TX Mirror - RX or TX Mirror - RX and TX Mirror Port VLAN Membership Check PTF2 Figure 5. Destination Address Resolution Flow Chart, Stage 2 The KSZ8993M will not forward the following packets: 1. Error packets. These include framing errors, FCS errors, alignment errors, and illegal size packet errors. 2. 802.3x pause frames. The KSZ8993M will intercept these packets and perform the appropriate actions. 3. "Local" packets. Based on destination address (DA) lookup. If the destination port from the lookup table matches the port where the packet was from, the packet is defined as "local." October 2008 29 M9999-020606 Micrel, Inc. KSZ8993M/ML Switching Engine The KSZ8993M features a high-performance switching engine to move data to and from the MACs' packet buffers. It operates in store and forward mode, while the efficient switching mechanism reduces overall latency. The KSZ8993M has a 32kB internal frame buffer. This resource is shared between all three ports. The buffersharing mode can be programmed through Global Register 2 (0x02). In one mode, ports are allowed to use any free buffers in the buffer pool. In the second mode, each port is only allowed to use one third of the total buffer pool. There are a total of 250 buffers available. Each buffer is sized at 128B. MAC Operation The KSZ8993M strictly abides by IEEE 802.3 standards to maximize compatibility. Inter Packet Gap (IPG) If a frame is successfully transmitted, the 96 bits time IPG is measured between the two consecutive MTXEN. If the current packet is experiencing collision, the 96 bits time IPG is measured from MCRS and the next MTXEN. Back-Off Algorithm The KSZ8993M implements the IEEE standard 802.3 binary exponential back-off algorithm, and optional "aggressive mode" back-off. After 16 collisions, the packet will be optionally dropped depending on the chip configuration in Global Register 3 (0x03) Late Collision If a transmit packet experiences collisions after 512 bit times of the transmission, the packet will be dropped. Illegal Frames The KSZ8993M discards frames less than 64 bytes and can be programmed to accept frames up to 1536 bytes in Global Register 4 (0x04). For special applications, the KSZ8993M can also be programmed to accept frames up to 1916 bytes in the same global register. Since the KSZ8993M supports VLAN tags, the maximum sizing is adjusted when these tags are present. See the EEPROM section for programming options. Flow Control The KSZ8993M supports standard 802.3x flow control frames on both transmit and receive sides. On the receive side, if the KSZ8993M receives a pause control frame, the KSZ8993M will not transmit the next normal frame until the timer, specified in the pause control frame, expires. If another pause frame is received before the current timer expires, the timer will be updated with the new value in the second pause frame. During this period (being flow controlled), only flow control packets from the KSZ8993M will be transmitted. On the transmit side, the KSZ8993M has intelligent and efficient ways to determine when to invoke flow control. The flow control is based on availability of the system resources, including available buffers, available transmit queues and available receive queues. The KSZ8993M will flow control a port, which just received a packet, if the destination port resource is being used up. The KSZ8993M will issue a flow control frame (XOFF), containing the maximum pause time defined in IEEE standard 802.3x. Once the resource is freed up, the KSZ8993M will send out the other flow control frame (XON) with zero pause time to turn off the flow control (turn on transmission to the port). A hysteresis feature is provided to prevent the flow control mechanism from being activated and deactivated too many times. The KSZ8993M will flow control all ports if the receive queue becomes full. Half-Duplex Backpressure A half-duplex backpressure option (Note: not in IEEE 802.3 standards) is also provided. The activation and deactivation conditions are the same as the above in full duplex mode. If backpressure is required, the KSZ8993M will send preambles to defer the other stations' transmission (carrier sense deference). To avoid jabber and excessive deference defined in 802.3 standard, after a certain time it will discontinue the carrier sense but it will raise the carrier sense quickly. This short silent time (no carrier sense) is to prevent other stations from October 2008 30 M9999-020606 Micrel, Inc. KSZ8993M/ML sending out packets and keeps other stations in carrier sense deferred state. If the port has packets to send during a backpressure situation, the carrier sense type back pressure will be interrupted and those packets will be transmitted instead. If there are no more packets to send, carrier sense type backpressure will be active again until switch resources free up. If a collision occurs, the binary exponential back-off algorithm is skipped and carrier sense is generated immediately, reducing the chance of further colliding and maintaining carrier sense to prevent reception of packets. To ensure no packet loss in 10 BASE-T or 100 BASE-TX half duplex modes, the user must enable the following: 1. Aggressive back off (Global Register 3 (0x03), bit 0 or external strap-in pin SMAC = high) 2. No excessive collision drop (Global Register 4 (0x04), bit 3 or external strap-in pin SMAC = high) These bits are not set as defaults because this is not the IEEE standard. Broadcast Storm Protection The KSZ8993M has an intelligent option to protect the switch system from receiving too many broadcast packets. Broadcast packets will be forwarded to all ports except the source port, and thus use too many switch resources (bandwidth and available space in transmit queues). The KSZ8993M has the option to include "multicast packets" for storm control. The broadcast storm rate parameters are programmed globally, and can be enabled or disabled on a per port basis. The rate is based on a 67ms interval for 100BT and a 500ms interval for 10BT. At the beginning of each interval, the counter is cleared to zero, and the rate limit mechanism starts to count the number of bytes during the interval. The rate definition is described in Global Register 6 (0x06) and 7 (0x07). The default setting for registers 6 and 7 is 0x63, which is 99 decimal. This is equal to a rate of 1%, calculated as follows: 148,800 frames/sec * 67ms/interval * 1% = 99 frames/interval (approx.) = 0x63 MII Interface Operation The MII is specified by the IEEE 802.3 standards committee and provides a common interface between physical layer and MAC layer devices. The MII Interface provided by the KSZ8993M is connected to the device's third MAC. The interface contains two distinct groups of signals: one for transmission and the other for reception. The following table describes the signals used in the MII interface. KSZ8993M PHY-Mode Connections External MAC KSZ8993M Controller Signals PHY Signals MTXEN SMTXEN MTXER MTXD3 MTXD2 MTXD1 MTXD0 MTXC MCOL MCRS MRXDV MRXER MRXD3 MRXD2 MRXD1 MRXD0 MRXC SMTXER SMTXD[3] SMTXD[2] SMTXD[1] SMTXD[0] SMTXC SCOL SCRS SMRXDV (not used) SMRXD[3] SMRXD[2] SMRXD[1] SMRXD[0] SMRXC KSZ8993M MAC-Mode Connections KSZ8993M External PHY Signals MAC Signals MTXEN SMRXDV MTXER MTXD3 MTXD2 MTXD1 MTXD0 MTXC MCOL MCRS MRXDV MRXER MRXD3 MRXD2 MRXD1 MRXD0 MRXC (not used) SMRXD[3] SMRXD[2] SMRXD[1] SMRXD[0] SMRXC SCOL SCRS SMTXEN SMTXER SMTXD[3] SMTXD[2] SMTXD[1] SMTXD[0] SMTXC Pin Descriptions Transmit enable Transmit error Transmit data bit 3 Transmit data bit 2 Transmit data bit 1 Transmit data bit 0 Transmit clock Collision detection Carrier sense Receive data valid Receive error Receive data bit 3 Receive data bit 2 Receive data bit 1 Receive data bit 0 Receive clock Table 3. MII Signals October 2008 31 M9999-020606 Micrel, Inc. KSZ8993M/ML The MII interface operates in either PHY mode or MAC mode. The interface is a nibble wide data interfaces and therefore run at 1/4 the network bit rate (not encoded). Additional signals on the transmit side indicate when data is valid or when an error occurs during transmission. Likewise, the receive side has indicators that convey when the data is valid and without physical layer errors. For half duplex operation there is a signal that indicates a collision has occurred during transmission. Note that the signal MRXER is not provided on the interface for PHY mode operation and the signal MTXER is not provided on the interface for MAC mode operation. Normally MRXER would indicate a receive error coming from the physical layer device. MTXER would indicate a transmit error from the MAC device. These signals are not appropriate for this configuration. For PHY mode operation, if the device interfacing with the KSZ8993M has an MRXER pin, it should be tied low. For MAC mode operation, if the device interfacing with the KSZ8993M has an MTXER pin, it should be tied low. SNI (7-Wire) Operation The serial network interface (SNI) or 7-wire is compatible with some controllers used for network layer protocol processing. In SNI mode, the KSZ8993M acts like a PHY and the external controller functions as the MAC. The KSZ8993M can interface directly with external controllers using the 7-wire interface. These signals are divided into two groups, one for transmission and the other for reception. The signals involved are described in the following table. Pin Descriptions Transmit enable Serial transmit data Transmit clock Collision detection Carrier sense Serial receive data Receive clock External MAC Controller Signals TXEN TXD TXC COL CRS RXD RXC Table 4. SNI Signals KSZ8993M PHY Signals SMTXEN SMTXD[0] SMTXC SCOL SMRXDV SMRXD[0] SMRXC The SNI interface is a bit wide data interface and therefore runs at the network bit rate (not encoded). An additional signal on the transmit side indicates when data is valid. Similarly, the receive side has an indicator that conveys when the data is valid. For half duplex operation, the KSZ8993M's SCOL signal is used to indicate that a collision has occurred during transmission. MII Management Interface (MIIM) The KSZ8993M supports the IEEE 802.3 MII Management Interface, also known as the Management Data Input/Output (MDIO) Interface. This interface allows upper-layer devices to monitor and control the states of the KSZ8993M. An external device with MDC/MDIO capability can be used to read the PHY status or configure the PHY settings. Further details on the MIIM interface can be found in section 22.2.4.5 of the IEEE 802.3 specification. October 2008 32 M9999-020606 Micrel, Inc. KSZ8993M/ML The MIIM interface consists of the following: A physical connection that incorporates the data line (MDIO) and the clock line (MDC). A specific protocol that operates across the aforementioned physical connection that allows an external controller to communicate with the KSZ8993M device. Access to a set of six 16-bits registers, consisting of standard MIIM registers [0:5]. The following table depicts the MII Management Interface frame format. Preamble Start of Frame Read/Write OP Code 10 01 PHY Address Bits [4:0] Read Write 32 1's 32 1's 01 01 xx0AA xx0AA REG Address Bits [4:0] RRRRR RRRRR Z0 10 DDDDDDDD_DDDDDDDD DDDDDDDD_DDDDDDDD Z Z TA Data Bits [15:0] Idle Table 5. MII Management Interface Frame Format For the KSZ8993M, MIIM register access is selected when bit 2 of the PHY address is set to `0'. PHY address bits [4:3] are not defined for MIIM register access, and hence can be set to either 0's or 1's in read/write operation. Serial Management Interface (SMI) The SMI is the KSZ8993M non-standard MIIM interface that provides access to all KSZ8993M configuration registers. This interface allows an external device to completely monitor and control the states of the KSZ8993M. The SMI interface consists of the following: A physical connection that incorporates the data line (MDIO) and the clock line (MDC). A specific protocol that operates across the aforementioned physical connection that allows an external controller to communicate with the KSZ8993M device. Access to all KSZ8993M configuration registers. Registers access includes the Global, Port and Advanced Control Registers 0-127 (0x00 - 0x7F), and indirect access to the standard MIIM registers [0:5]. The following table depicts the SMI frame format. Preamble Start of Frame Read/Write OP Code 10 01 PHY Address Bits [4:0] Read Write 32 1's 32 1's 01 01 RR1xx RR1xx REG Address Bits [4:0] RRRRR RRRRR Z0 10 0000_0000_DDDD_DDDD xxxx_xxxx_DDDD_DDDD Z Z TA Data Bits [15:0] Idle Table 6. Serial Management Interface (SMI) Frame Format For the KSZ8993M, SMI register access is selected when bit 2 of the PHY address is set to `1'. PHY address bits [1:0] are not defined for SMI register access, and hence can be set to either 0's or 1's in read/write operation. To access the KSZ8993M registers 0-127 (0x00 - 0x7F), the following applies: PHYAD[4:3] and REGAD[4:0] are concatenated to form the 7-bits address; that is, {PHYAD[4:3], REGAD[4:0]} = bits [6:0] of the 7-bits address. October 2008 33 M9999-020606 Micrel, Inc. KSZ8993M/ML Registers are 8 data bits wide. For read operation, data bits [15:8] are read back as 0's. For write operation, data bits [15:8] are not defined, and hence can be set to either 0's or 1's. SMI register access is the same as the MIIM register access, except for the register access requirements presented in this section. Advanced Switch Functions Spanning Tree Support To support spanning tree, port 3 is the designated port for the processor. The other ports (port 1 and port 2) can be configured in one of the five spanning tree states via "transmit enable", "receive enable" and "learning disable" register settings in registers 18 and 34 for ports 1 and 2, respectively. The following description shows the port setting and software actions taken for each of the five spanning tree states. Disable state: The port should not forward or receive any packets. Learning is disabled. Port setting: "transmit enable = 0, receive enable = 0, learning disable =1" Software action: The processor should not send any packets to the port. The switch may still send specific packets to the processor (packets that match some entries in the "static MAC table" with "overriding bit" set) and the processor should discard those packets. Note: processor is connected to port 3 via MII interface. Address learning is disabled on the port in this state. Blocking state: Only packets to the processor are forwarded. Learning is disabled. Port setting: "transmit enable = 0, receive enable = 0, learning disable =1" Software action: The processor should not send any packets to the port(s) in this state. The processor should program the "Static MAC table" with the entries that it needs to receive (e.g. BPDU packets). The "overriding" bit should also be set so that the switch will forward those specific packets to the processor. Address learning is disabled on the port in this state. Listening state: Only packets to and from the processor are forwarded. Learning is disabled. Port setting: "transmit enable = 0, receive enable = 0, learning disable =1" Software action: The processor should program the "Static MAC table" with the entries that it needs to receive (e.g., BPDU packets). The "overriding" bit should be set so that the switch will forward those specific packets to the processor. The processor may send packets to the port(s) in this state, see "Special Tagging Mode" for details. Address learning is disabled on the port in this state. Learning state: Only packets to and from the processor are forwarded. Learning is enabled. Port setting: "transmit enable = 0, receive enable = 0, learning disable = 0" October 2008 34 M9999-020606 Micrel, Inc. KSZ8993M/ML Software action: The processor should program the "Static MAC table" with the entries that it needs to receive (e.g., BPDU packets). The "overriding" bit should be set so that the switch will forward those specific packets to the processor. The processor may send packets to the port(s) in this state, see "Special Tagging Mode" for details. Address learning is enabled on the port in this state. Forwarding state: Packets are forwarded and received normally. Learning is enabled. Port setting: "transmit enable = 1, receive enable = 1, learning disable = 0" Software action: The processor should program the "Static MAC table" with the entries that it needs to receive (e.g., BPDU packets). The "overriding" bit should be set so that the switch will forward those specific packets to the processor. The processor may send packets to the port(s) in this state, see "Special Tagging Mode" for details. Address learning is enabled on the port in this state. Upstream Special Tagging Mode Upstream Special Tagging Mode is designed for spanning tree protocol IGMP snooping and is flexible for use in other applications. The Upstream Special Tagging Mode, similar to 802.1Q, requires software to change network drivers to modify/strip/interpret the special tag. This mode is enabled by setting both register 11 bit 0 and register 48 bit 2 to "1". 802.1Q Tag Format TPID (tag protocol identifier, 0x8100) + TCI. Special Tag Format STPID (special tag identifier, 0x810 + 4 bit for "port mask") + TCI Table 7. Upstream Special Tagging Mode Format The STPID is only seen and used by the port 3 interface, which should be connected to a processor. The KSZ8993M uses a non-zero "port mask" to bypass the lookup result and override any port setting, regardless of port states (disable, blocking, listening, learning). For packets from regular ports (port 1 & port 2) to port 3, the port mask is used to tell the processor which port the packets were received on, defined as follows: "0001" from port 1 "0010" from port 2 No port mask values, other than the previous two defined ones, should be received in Upstream Special Tagging Mode. The egress rules are defined as follows: Ingress Packets Egress Action to Tag Field - Modify TPID to 0x810 + "port mask", which indicates source port. Tagged with 0x8100 + TCI - No change to TCI if VID is not null - Replace null VID with ingress port VID - Recalculate CRC - Insert TPID to 0x810 + "port mask", which indicates source port Not tagged. - Insert TCI with ingress port VID - Recalculate CRC Table 8. STPID Egress Rules (Switch Port 3 to Processor) October 2008 35 M9999-020606 Micrel, Inc. KSZ8993M/ML IGMP Support For IGMP support in layer 2, the KSZ8993M provides two components: "IGMP" Snooping The KSZ8993M will trap IGMP packets and forward them only to the processor (port 3). The IGMP packets are identified as IP packets (either Ethernet IP packets, or IEEE 802.3 SNAP IP packets) with IP version = 0x4 and protocol version number = 0x2. "Multicast Address Insertion" in the Static MAC Table Once the multicast address is programmed in the Static MAC Table, the multicast session will be trimmed to the subscribed ports, instead of broadcasting to all ports. To enable IGMP support, set register 5 bit 6 to "1". Also, "Special Tagging Mode" needs to be enabled, so that the processor knows which port the IGMP packet was received on. This is achieved by setting both register 11 bit 0 and register 48 bit 2 to "1." Port Mirroring Support KSZ8993M supports "Port Mirroring" comprehensively as: 1. "receive only" mirror on a port All the packets received on the port will be mirrored on the sniffer port. For example, port 1 is programmed to be "receive sniff" and port 3 is programmed to be the "sniffer port". A packet received on port 1 is destined to port 2 after the internal lookup. The KSZ8993M will forward the packet to both port 2 and port 3. The KSZ8993M can optionally forward even "bad" received packets to the "sniffer port". 2. "transmit only" mirror on a port All the packets transmitted on the port will be mirrored on the sniffer port. For example, port 1 is programmed to be "transmit sniff" and port 3 is programmed to be the "sniffer port". A packet received on port 2 is destined to port 1 after the internal lookup. The KSZ8993M will forward the packet to both port 1 and port 3. 3. "receive and transmit" mirror on two ports All the packets received on port A and transmitted on port B will be mirrored on the sniffer port. To turn on the "AND" feature, set register 5 bit 0 to "1". For example, port 1 is programmed to be "receive sniff", port 2 is programmed to be "transmit sniff" and port 3 is programmed to be the "sniffer port". A packet received on port 1 is destined to port 2 after the internal lookup. The KSZ8993M will forward the packet to both port 2 and port 3. Multiple ports can be selected to be "receive sniff" or "transmit sniff". And any port can be selected to be the "sniffer port". All these per port features can be selected through registers 17, 33 and 49 for ports 1, 2 and 3, respectively. IEEE 802.1Q VLAN Support The KSZ8993M supports 16 active VLANs out of the 4096 possible VLANs specified in the IEEE 802.1Q specification. KSZ8993M provides a 16-entries VLAN Table, which converts the 12-bits VLAN ID (VID) to the 4bits Filter ID (FID) for address lookup. If a non-tagged or null-VID-tagged packet is received, the ingress port default VID is used for lookup. In VLAN mode, the lookup process starts with VLAN Table lookup to determine whether the VID is valid. If the VID is not valid, the packet will be dropped and its address will not be learned. If the VID is valid, the FID is retrieved for further lookup. The FID + Destination Address (FID+DA) are used to determine the destination port. The FID + Source Address (FID+SA) are used for address learning. October 2008 36 M9999-020606 Micrel, Inc. KSZ8993M/ML DA found in Static MAC Table? No No Yes Yes Yes Yes Use FID flag? FID match? DA+FID found in Dynamic MAC Table? No Yes Don't care No Yes Don't care Action Broadcast to the membership ports defined in the VLAN Table bits [18:16] Send to the destination port defined in the Dynamic MAC Address Table bits [53:52] Send to the destination port(s) defined in the Static MAC Address Table bits [50:48] Broadcast to the membership ports defined in the VLAN Table bits [18:16] Send to the destination port defined in the Dynamic MAC Address Table bits [53:52] Send to the destination port(s) defined in the Static MAC Address Table bits [50:48] Don't care Don't care 0 1 1 1 Don't care Don't care Don't care No No Yes Table 9. FID+DA Lookup in VLAN Mode FID+SA found in Dynamic MAC Table? No Yes Action Learn and add FID+SA to the Dynamic MAC Address Table Update time stamp Table 10. FID+SA Lookup in VLAN Mode Advanced VLAN features, such as "Ingress VLAN filtering" and "Discard Non PVID packets" are also supported by the KSZ8993M. These features can be set on a per port basis, and are defined in register 18, bit 6 and bit 5, respectively for port 1. QoS Priority Support This feature provides Quality of Service (QoS) for applications, such as VoIP and video conferencing. The KSZ8993M per port transmit queue could be split into two priority queues: a high priority queue and a low priority queue. Bit 0 of registers 16, 32 and 48 is used to enable split transmit queues for ports 1, 2 and 3, respectively. Optionally, the Px_TXQ2 strap-in pins can be used to enable this feature. With split transmit queues, high priority packets will be placed in the high priority queue and low priority packets will be placed in the low priority queue. For split transmit queues, the KSZ8993M provides four priority schemes: 1. "Transmit all high priority packets before low priority packets;" i.e. a low priority packet could be transmitted only when the high priority queue is empty 2. "Transmit high priority packets and low priority packets at 10:1 ratio;" i.e. transmit a low priority packet after every 10 high priority packets are transmitted, if both queues are busy 3. "Transmit high priority packets and low priority packets at 5:1 ratio" 4. "Transmit high priority packets and low priority packets at 2:1 ratio" If a port's transmit queue is not split, both high priority packets and low priority packets have equal priority in the transmit queue. Register 5 bits [3:2] are used to select the desired priority scheme. Optionally, the PRSEL1 and PRSEL0 strap-in pins can be used. October 2008 37 M9999-020606 Micrel, Inc. KSZ8993M/ML Port-Based Priority With port based priority, each ingress port can be individually classified as a high priority receiving port. All packets received at the high priority receiving port are marked as high priority, and will be sent to the high priority transmit queue if the corresponding transmit queue is split. Bit 4 of registers 16, 32 and 48 is used to enable port based priority for ports 1, 2 and 3, respectively. Optionally, the Px_PP strap-in pins can be used to enable this feature. 802.1p-Based Priority For 802.1p based priority, the KSZ8993M will examine the ingress (incoming) packets to determine whether they are tagged. If tagged, the 3-bits priority field in the VLAN tag is retrieved and compared against the "priority base" value, specified by register 2 bits [6:4]. The "priority base" value is programmable; its default value is 0x4. The following figure illustrates how the 802.1p priority field is embedded in the 802.1Q VLAN tag. Bytes 8 Preamble 6 DA 6 SA 2 VPID 2 TCI 2 length LLC 46-1500 Data 4 FCS Bits 16 Tagged Packet Type (8100 for Ethernet) 3 802.1p 1 CFI 12 VLAN ID 802.1q VLAN Tag Figure 6. 802.1p Priority Field Format If an ingress packet has an equal or higher priority value than the "priority base" value, the packet will be placed in the high priority transmit queue if the corresponding transmit queue is split. 802.1p based priority is enabled by bit 5 of registers 16, 32 and 48 for ports 1, 2 and 3, respectively. Optionally, the Px_1PEN strap-in pins can be used to enable this feature. The KSZ8993M provides the option to insert or remove the priority tagged frame's header at each individual egress port. This header, consisting of the 2 bytes VLAN Protocol ID (VPID) and the 2 bytes Tag Control Information field (TCI), is also refer to as the 802.1Q VLAN Tag. Tag Insertion is enabled by bit 2 of registers 16, 32 and 48 for ports 1, 2 and 3, respectively. Optionally, the Px_TAGINS strap-in pins can be used to enable this feature. At the egress port, untagged packets are tagged with the ingress port's default tag. The default tags are programmed in register sets {19,20}, {35,36} and {51,52} for ports 1, 2 and 3, respectively. The KSZ8993M will not add tags to already tagged packets. Tag Removal is enabled by bit 1 of registers 16, 32 and 48 for ports 1, 2 and 3, respectively. Optionally, the Px_TAGRM strap-in pins can be used to enable this feature. At the egress port, tagged packets will have their 802.1Q VLAN Tags removed. The KSZ8993M will not modify untagged packets. The CRC is recalculated for both tag insertion and tag removal. 802.1p Priority Field Re-mapping is a QoS feature that allows the KSZ8993M to set the "User Priority Ceiling" at any ingress port. If the ingress packet's priority field has a higher priority value than the default tag's priority field of the ingress port, the packet's priority field is replaced with the default tag's priority field. The "User Priority Ceiling" is enabled by bit 3 of registers 16, 32 and 48 for ports 1, 2 and 3, respectively. DiffServ-Based Priority DiffServ-based priority uses registers 96 to 103. More details are provided at the beginning of the Advanced Control Registers section. October 2008 38 M9999-020606 Micrel, Inc. KSZ8993M/ML Rate Limiting Support The KSZ8993M supports hardware rate limiting independently on the "receive side" and on the "transmit side" on a per port basis. Rate limiting is supported in both priority and non-priority environment. The rate limit starts from 0 kbps and goes up to the line rate in steps of 32 kbps. The KSZ8993M uses "one second" as the rate limiting interval. At the beginning of each interval, the counter is cleared to zero, and the rate limit mechanism starts to count the number of bytes during the interval. On the "receive side", if the number of bytes exceeds the programmed limit, the switch will stop receiving packets on the port until the "one second" interval expires. Flow control can be enabled to prevent packet loss. If the rate limit is programmed greater than or equal to 128 kbps and the byte counter is 8 Kbytes below the limit, flow control will be triggered. If the rate limit is programmed lower than 128 kbps and the byte counter is 2 Kbytes below the limit, flow control will also be triggered. On the "transmit side", if the number of bytes exceeds the programmed limit, the switch will stop transmitting packets on the port until the "one second" interval expires. If priority is enabled, the KSZ8993M can be programmed to support different rate limits for high priority packets and low priority packets. Configuration Interface The KSZ8993M can operate as both a managed switch and an unmanaged switch. In unmanaged mode, the KSZ8993M is typically programmed using an EEPROM. If no EEPROM is present, the KSZ8993M is configured using its default register settings. Some defaults settings are configured via strap-in pin options. The strap-in pins are indicated in the "KSZ8993M Pin Description and I/O Assignment" table. I2C Master Serial Bus Configuration With an additional I2C ("2-wire") EEPROM, the KSZ8993M can perform more advanced switch features like "broadcast storm protection" and "rate control" without the need of an external processor. For KSZ8993M I2C Master configuration, the EEPROM stores the configuration data for register 0 to register 109 (as defined in the KSZ8993M register map) with the exception of the "Read Only" status registers. After the deassertion of reset, the KSZ8993M will sequentially read in the configuration data for all 110 registers, starting from register 0. The configuration access time (tprgm) is less than 15 ms, as depicted in the following figure. RST_N SCL SDA .... .... .... tprgm<15 ms Figure 7. KSZ8993M EEPROM Configuration Timing Diagram The following is a sample procedure for programming the KSZ8993M with a pre-configured EEPROM: 1. Connect the KSZ8993M to the EEPROM by joining the SCL and SDA signals of the respective devices. For the KSZ8993M, SCL is pin 97 and SDA is pin 98. October 2008 39 M9999-020606 Micrel, Inc. KSZ8993M/ML 2. Enable I2C master mode by setting the KSZ8993M strap-in pins, PS[1:0] (pins 100 and 101, respectively) to "00". 3. Check to ensure that the KSZ8993M reset signal input, RST_N (pin 67), is properly connected to the external reset source at the board level. 4. Program the desired configuration data into the EEPROM. 5. Place the EEPROM on the board and power up the board. 6. Assert an active-low reset to the RST_N pin of the KSZ8993M. After reset is de-asserted, the KSZ8993M will begin reading the configuration data from the EEPROM. The KSZ8993M will check that the first byte read from the EEPROM is "93". If this value is correct, EEPROM configuration will continue. If not, EEPROM configuration access is denied and all other data sent from the EEPROM will be ignored by the KSZ8993M. The configuration access time (tprgm) is less than 15ms. Note: For proper operation, check to ensure that the KSZ8993M PWRDN input signal (pin 36) is not asserted during the reset operation. The PWRDN input is active low. I2C Slave Serial Bus Configuration In managed mode, the KSZ8993M can be configured as an I2C slave device. In this mode, an I2C master device (external controller/CPU) has complete programming access to the KSZ8993M's 128 registers. Programming access includes the Global Registers, Port Registers, Advanced Control Registers and indirect access to the "Static MAC Table", "VLAN Table", "Dynamic MAC Table," and "MIB Counters." The tables and counters are indirectly accessed via registers 110 thru 120. In I2C slave mode, the KSZ8993M operates like other I2C slave devices. Addressing the KSZ8993M's 8 bit registers is similar to addressing Atmel's AT24C02 EEPROM's memory locations. Details of I2C read/write operations and related timing information can be found in the AT24C02 Datasheet. Two fixed 8 bits device addresses are used to address the KSZ8993M in I2C slave mode. One is for read; the other is for write. The addresses are as follow: 1011_1111 October 2008 40 M9999-020606 Micrel, Inc. KSZ8993M/ML SPI multiple read is initiated when the master device continues to drive the KSZ8993M SPIS_N input pin (SPI Slave Select signal) low after a byte (a register) is read. The KSZ8993M internal address counter will increment automatically to the next byte (next register) after the read. The next byte at the next register address will be shifted out onto the KSZ8993M SPIQ output pin. SPI multiple read will continue until the SPI master device terminates it by de-asserting the SPIS_N signal to the KSZ8993M. Similarly, SPI multiple write is initiated when the master device continues to drive the KSZ8993M SPIS_N input pin low after a byte (a register) is written. The KSZ8993M internal address counter will increment automatically to the next byte (next register) after the write. The next byte that is sent from the master device to the KSZ8993M SDA input pin will be written to the next register address. SPI multiple write will continue until the SPI master device terminates it by de-asserting the SPIS_N signal to the KSZ8993M. For both SPI multiple read and multiple write, the KSZ8993M internal address counter will wrap back to register address zero once the highest register address is reached. This feature allows all 128 KSZ8993M registers to be read, or written with a single SPI command and any initial register address. The KSZ8993M is capable of supporting a 5MHz SPI bus. The following is a sample procedure for programming the KSZ8993M using the SPI bus: 1. At the board level, connect the KSZ8993M pins as follows: KSZ8993M Pin # 99 97 98 96 KSZ8993M Signal Name SPIS_N SCL (SPIC) SDA (SPID) SPIQ External Processor Signal Description SPI Slave Select SPI Clock SPI Data (Master output; Slave input) SPI Data (Master input; Slave output) Table 11. KSZ8993M SPI Connections 2. Enable SPI slave mode by setting the KSZ8993M strap-in pins PS[1:0] (pins 100 and 101, respectively) to "10". 3. Power up the board and assert reset to the KSZ8993M. After reset, the "Start Switch" bit (register 1 bit 0) will be set to `0'. 4. Configure the desired register settings in the KSZ8993M, using the SPI write or multiple write command. 5. Read back and verify the register settings in the KSZ8993M, using the SPI read or multiple read command. 6. Write a `1' to the "Start Switch" bit to start the KSZ8993M with the programmed settings. Note: The "Start Switch" bit cannot be set to `0' to stop the switch after an `1' is written to this bit. Thus, it is recommended that all switch configuration settings are programmed before the "Start Switch" bit is set to `1'. Some of the configuration settings, such as "Aging enable", "Auto Negotiation Enable", "Force Speed" and "Power down" can be programmed after the switch has been started. The following four figures illustrate the SPI data cycles for "Write", "Read", "Multiple Write" and "Multiple Read". The read data is registered out of SPIQ on the falling edge of SPIC, and the data input on SPID is registered on the rising edge of SPIC. October 2008 41 M9999-020606 Micrel, Inc. KSZ8993M/ML SPIS_N SPIC SPID SPIQ X 0 0 0 0 0 0 1 0 A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 WRITE COMMAND WRITE ADDRESS WRITE DATA Figure 8. SPI Write Data Cycle SPIS_N SPIC SPID SPIQ X 0 0 0 0 0 0 1 1 A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 READ COMMAND READ ADDRESS READ DATA Figure 9. SPI Read Data Cycle SPIS_N SPIC SPID SPIQ X 0 0 0 0 0 0 1 0 A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 WRITE COMMAND SPIS_N SPIC SPID SPIQ D7 D6 D5 D4 D4 D2 D1 D0 D7 D6 D5 WRITE ADDRESS Byte 1 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 Byte 2 Byte 3 ... Byte N Figure 10. SPI Multiple Write October 2008 42 M9999-020606 Micrel, Inc. KSZ8993M/ML SPIS_N SPIC SPID SPIQ X 0 0 0 0 0 0 1 1 A7 A6 A5 A4 A3 A2 A1 A0 X D7 X D6 X D5 X D4 X D3 X D2 X D1 X D0 READ COMMAND SPIS_N SPIC SPID SPIQ X D7 READ ADDRESS Byte 1 X D6 X D5 X D4 X D3 X D2 X D1 X D0 X D7 X D6 X D5 X D4 X D3 X D2 X D1 X D0 X D7 X D6 X D5 X D4 X D3 X D2 X D1 X D0 Byte 2 Byte 3 Byte N Figure 11. SPI Multiple Read October 2008 43 M9999-020606 Micrel, Inc. KSZ8993M/ML Loopback Support The KSZ8993M provides loopback support for remote diagnostic of failure. In loopback mode, the speed at both PHY ports needs to be set to 100BASE-TX, and the "Priority Buffer reserve" bit needs to be set to 48 preallocated buffers per output queue. The latter is required to prevent loopback packet drops and is achieved by setting register 4 bit 0 to `1'. Bit 0 of registers 29 and 45 is used to enable loopback for ports 1 and 2, respectively. Alternatively, the MII Management register 0, bit 14 can be used to enable loopback. Loopback is conducted between the KSZ8993M's two PHY ports. The loopback path starts at the "Originating." PHY ports receive inputs (RXP/RXM), wraps around at the "loopback" PHY port's PMD/PMA, and ends at the "Originating" PHY port's transmit outputs (TXP/TXM). The KSZ8993M loopback path is illustrated in the following figure. Figure 12. Loopback Path October 2008 44 M9999-020606 Micrel, Inc. KSZ8993M/ML MII Management (MIIM) Registers The MIIM interface is used to access the MII PHY registers defined in this section. The SPI, I2C, and SMI interfaces can also be used to access these registers. The latter three interfaces use a different mapping mechanism than the MIIM interface. As defined in the IEEE 802.3 specification, the "PHYAD" are assigned as "0x1" for PHY port 1 and "0x2" for PHY port 2. The "REGAD" supported are 0,1,2,3,4, and 5. Register Number 0x0 0x1 0x2 0x3 0x4 0x5 0x6 - 0x1F Description Basic Control Register Basic Status Register Physical Identifier I Physical Identifier II Auto-Negotiation Advertisement Register Auto-Negotiation Link Partner Ability Register Not supported Register 0: MII Basic Control Bit 15 14 13 12 11 10 9 8 7 6 5 4 Name Soft reset Loopback Force 100 AN enable Power down Isolate Restart AN Force full duplex Collision test Reserved Reserved Force MDI R/W RO R/W R/W R/W R/W RO R/W R/W RO RO RO R/W =1, Force MDI (transmit on RXP / RXM pins) =0, Normal operation (transmit on TXP / TXM pins) Description NOT SUPPORTED =1, Loopback mode =0, Normal operation =1, 100 Mbps =0, 10 Mbps =1, Auto-negotiation enabled =0, Auto-negotiation disabled =1, Power down =0, Normal operation NOT SUPPORTED =1, Restart auto-negotiation =0, Normal operation =1, Full duplex =0, Half duplex NOT SUPPORTED 0 0 0 0 Reg. 29, bit 1 Reg. 45, bit 1 0 0 0 Reg. 29, bit 5 Reg. 45, bit 5 Reg. 28, bit 5 Reg. 44, bit 5 0 Reg. 29, bit 3 Reg. 45, bit 3 1 0 Default 0 0 Reg. 29, bit 0 Reg. 45, bit 0 Reg. 28, bit 6 Reg. 44, bit 6 Reference October 2008 45 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 0: MII Basic Control (continued) Bit 3 2 1 0 Name Disable MDIX Disable far end fault Disable transmit Disable LED R/W R/W R/W R/W R/W Description =1, Disable auto MDI-X =0, Normal operation =1, Disable far end fault detection =0, Normal operation =1, Disable transmit =0, Normal operation =1, Disable LED =0, Normal operation 0 0 Reg. 29, bit 6 Reg. 45, bit 6 Reg. 29, bit 7 Reg. 45, bit 7 0 Default 0 Reference Reg. 29, bit 2 Reg. 45, bit 2 Reg. 29, bit 4 Register 1: MII Basic Status Bit 15 14 13 12 11 10-7 6 5 4 3 2 1 0 Name T4 capable 100 Full capable 100 Half capable 10 Full capable 10 Half capable Reserved Preamble suppressed AN complete Far end fault AN capable Link status Jabber test Extended capable R/W RO RO RO RO RO RO RO RO RO RO RO RO RO NOT SUPPORTED =1, Auto-negotiation complete =0, Auto-negotiation not completed =1, Far end fault detected =0, No far end fault detected =1, Auto-negotiation capable =0, Not auto-negotiation capable =1, Link is up =0, Link is down NOT SUPPORTED =0, Not extended register capable 0 0 0 1 Reg. 28, bit 7 Reg. 44, bit 7 Reg. 30, bit 5 Reg. 46, bit 5 0 Description =0, Not 100 BASE-T4 capable =1, 100BASE-TX full duplex capable =0, Not capable of 100BASE-TX full duplex =1, 100BASE-TX half duplex capable =0, Not 100BASE-TX half duplex capable =1, 10BASE-T full duplex capable =0, Not 10BASE-T full duplex capable =1, 10BASE-T half duplex capable =0, Not 10BASE-T half duplex capable 0 0 0 Reg. 30, bit 6 Reg. 46, bit 6 Reg. 31, bit 0 1 Always 1 1 Always 1 1 Always 1 Default 0 1 Always 1 Reference Register 2: PHYID HIGH Bit 15-0 Name PHYID high R/W RO Description High order PHYID bits Default 0x0022 Register 3: PHYID LOW Bit 15-0 Name R/W Description Default PHYID low RO Low order PHYID bits 0x1430 October 2008 46 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 4: Auto-Negotiation Advertisement Ability Bit 15 14 13 12-11 10 9 8 7 Name Next page Reserved Remote fault Reserved Pause Reserved Adv 100 Full Adv 100 Half R/W RO RO RO RO R/W R/W R/W R/W =1, Advertise 100 full duplex ability =0, Do not advertise 100 full duplex ability =1, Advertise 100 half duplex ability =0, Do not advertise 100 half duplex ability 6 5 4-0 Adv 10 Full Adv 10 Half Selector field R/W R/W RO =1, Advertise 10 full duplex ability =0, Do not advertise 10 full duplex ability =1, Advertise 10 half duplex ability =0, Do not advertise 10 half duplex ability 802.3 00001 1 1 1 =1, Advertise pause ability =0, Do not advertise pause ability 0 1 Reg. 28, bit 3 Reg. 44, bit 3 Reg. 28, bit 2 Reg. 44, bit 2 Reg. 28, bit 1 Reg. 44, bit 1 Reg. 28, bit 0 Reg. 44, bit 0 NOT SUPPORTED Description NOT SUPPORTED Default 0 0 0 0 1 Reg. 28, bit 4 Reg. 44, bit 4 Reference Register 5: Auto-Negotiation Link Partner Ability Bit 15 14 13 12-11 10 9 8 7 6 5 4-0 Name Next page LP ACK Remote fault Reserved Pause Reserved Adv 100 Full Adv 100 Half Adv 10 Full Adv 10 Half Reserved R/W RO RO RO RO RO RO RO RO RO RO RO Link partner 100 full capability Link partner 100 half capability Link partner 10 full capability Link partner 10 half capability Link partner pause capability Description NOT SUPPORTED NOT SUPPORTED NOT SUPPORTED Default 0 0 0 0 0 0 0 0 0 0 00000 Reg. 30, bit 3 Reg. 46, bit 3 Reg. 30, bit 2 Reg. 46, bit 2 Reg. 30, bit 1 Reg. 46, bit 1 Reg. 30, bit 0 Reg. 46, bit 0 Reg. 30, bit 4 Reg. 46, bit 4 Reference October 2008 47 M9999-020606 Micrel, Inc. KSZ8993M/ML Register Map: Switch & PHY (8 bit registers) Global Registers Register (Decimal) 0-1 2-11 12 13-15 Register (Hex0 0x00-0x01 0x02-0x0B 0x0C 0x0D-0x0F Description Chip ID Registers Global Control Registers Reserved Register User Defined Registers Port Registers Register (Decimal) 16-29 30-31 32-45 46-47 48-61 62-63 64-95 Register (Hex0 0x10-0x1D 0x1E-0x1F 0x20-0x2D 0x2E-0x2F 0x30-0x3D 0x3E-0x3F 0x40-0x5F Description Port 1 Control Registers, including MII PHY Registers Port 1 Status Registers, including MII PHY Registers Port 2 Control Registers, including MII PHY Registers Port 2 Status Registers, including MII PHY Registers Port 3 Control Registers, including MII PHY Registers Port 3 Status Registers, including MII PHY Registers Reserved Advanced Control Registers Register (Decimal) 96-103 104-109 110-111 112-120 121-122 123-124 125-126 127 Register (Hex0 0x60-0x67 0x68-0x6D 0x6E-0x6F 0x70-0x78 0x79-0x7A 0x7B-0x7C 0x7D-0x7E 0x7F Description TOS Priority Control Registers Switch Engine's MAC Address Registers Indirect Access Control Registers Indirect Data Registers Digital Testing Status Registers Digital Testing Control Registers Analog Testing Control Registers Analog Testing Status Register Global Registers Register 0 (0x00): Chip ID0 Bit 7-0 Name Family ID R/W RO Description Chip family Default 0x93 October 2008 48 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 1 (0x01): Chip ID1 / Start Switch Bit 7-4 3-1 0 Name Chip ID Revision ID Start switch R/W RO RO RW Description 0x0 is assigned to M series. (93M) Revision ID = 1, start the chip when external pins (PS1, PS0) = (0,1) or (1,0) or (1,1). Note: In (PS1, PS0) = (0, 0) mode, the chip will start automatically after trying to read the external EEPROM. If EEPROM does not exist, the chip will use pin strapping and default values for all internal registers. If EEPROM is present, the contents in the EEPROM will be checked. The switch will check: (1) Register 0 = 0x93, (2) Register 1 bits [7:4] = 0x0. If this check is OK, the contents in the EEPROM will override chip registers' default values. = 0, chip will not start when external pins (PS1, PS0) = (0,1) or (1,0) or (1,1). Default 0x0 - Register 2 (0x02): Global Control 0 Bit 7 Name New back-off Enable 6-4 802.1p base priority R/W R/W R/W Description New back-off algorithm designed for UNH 1 = Enable 0 = Disable Used to classify priority for incoming 802.1Q packets. "user priority" is compared against this value. >= : classified as high priority < 3 2 Pass flow control packet Buffer share mode R/W R/W : classified as low priority 0x0 0x1 = 1, switch will not filter 802.1x "flow control" packets = 1, buffer pool is shared by all ports. A port can use more buffers when other ports are not busy. = 0, a port is only allowed to use 1/3 of the buffer pool. 1 0 Reserved Link change age R/W R/W Reserved = 1, link change from "link" to "no link" will cause fast aging (<800us) to age address table faster. After an age cycle is complete, the age logic will return to normal aging (about 200 sec). Note: If any port is unplugged, all addresses will be automatically aged out. 0 0 0x4 Default 0x0 October 2008 49 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 3 (0x03): Global Control 1 Bit 7 Name Pass all frames R/W R/W Description = 1, switch all packets including bad ones. Used solely for debugging purposes. Works in conjunction with sniffer mode only. 0 = normal mode 1 = repeater mode (half duplex Hub mode) R/W = 1, will enable transmit direction flow control feature. = 0, will not enable transmit direction flow control feature. R/W = 1, will enable receive direction flow control feature. = 0, will not enable receive direction flow control feature. R/W 1 = will check frame length field in the IEEE packets. If the actual length does not match, the packet will be dropped (for Length/Type field < 1500). 2 1 0 Aging enable Fast age enable Aggressive back off enable R/W R/W R/W 1 = enable age function in the chip 0 = disable age function in the chip 1 = turn on fast age (800us) 1 = enable more aggressive back off algorithm in half duplex mode to enhance performance. This is not an IEEE standard. 0 SMAC (pin 69) value during reset. 1 0 1 1 Default 0 6 5 Repeater mode IEEE 802.3x Transmit direction flow control enable IEEE 802.3x Receive direction flow control enable Frame Length field check R/W 0 4 3 Register 4 (0x04): Global Control 2 Bit 7 Name Unicast portVLAN mismatch discard R/W R/W Description This feature is used for port-VLAN (described in reg. 17, reg. 33, ...) = 1, all packets can not cross VLAN boundary = 0, unicast packets (excluding unkown/multicast/broadcast) can cross VLAN boundary Note: Port mirroring is not supported if this bit is set to "0". 6 Multicast storm protection disable R/W = 1, "Broadcast Storm Protection" does not include multicast packets. Only DA = FFFFFFFFFFFF packets will be regulated. = 0, "Broadcast Storm Protection" includes DA = FFFFFFFFFFFF and DA[40] = 1 packets. 5 Back pressure Mode R/W = 1, carrier sense based backpressure is selected = 0, collision based backpressure is selected 1 1 Default 1 October 2008 50 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 4 (0x04): Global Control 2 (continued) Bit 4 Name Flow control and back pressure fair mode R/W R/W Description = 1, fair mode is selected. In this mode, if a flow control port and a non-flow control port talk to the same destination port, packets from the non-flow control port may be dropped. This is to prevent the flow control port from being flow controlled for an extended period of time. = 0, in this mode, if a flow control port and a non-flow control port talk to the same destination port, the flow control port will be flow controlled. This may not be "fair" to the flow control port. 3 No excessive collision drop R/W = 1, the switch will not drop packets when 16 or more collisions occur. = 0, the switch will drop packets when 16 or more collisions occur. 2 Huge packet support R/W = 1, will accept packet sizes up to 1916 bytes (inclusive). This bit setting will override setting from bit 1 of the same register. = 0, the max packet size will be determined by bit 1 of this register. 1 Legal Maximum Packet size check enable Priority Buffer reserve R/W = 0, will accept packet sizes up to 1536 bytes (inclusive). = 1, 1522 bytes for tagged packets, 1518 bytes for untagged packets. Any packets larger than the specified value will be dropped. R/W = 1, each output queue is pre-allocated 48 buffers, used exclusively for high priority packets. It is recommended to enable this when priority queue feature is turned on. = 0, no reserved buffers for high priority packets. SMRXD0 (pin 85) value during reset. 1 SMAC (pin 69) value during reset. 0 Default 1 0 Register 5 (0x05): Global Control 3 Bit 7 Name 802.1Q VLAN enable IGMP snoop enable on Switch MII interface Reserved Reserved Priority Scheme select R/W R/W Description = 1, 802.1Q VLAN mode is turned on. VLAN table needs to set up before the operation. = 0, 802.1Q VLAN is disabled. 6 R/W =1, IGMP snoop is enabled. All the IGMP packets will be forwarded to the Switch MII port. =0, IGMP snoop is disabled. R/W R/W R/W 00 = always deliver high priority packets first 01 = deliver high/low packets at ratio 10/1 10 = deliver high/low packets at ratio 5/1 11 = deliver high/low packets at ratio 2/1 1 Reserved R/W 0 0 0 00 0 Default 0 5 4 3-2 October 2008 51 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 5 (0x05): Global Control 3 (continued) Bit 0 Name Sniff mode select R/W R./W Description = 1, will do rx AND tx sniff (both source port and destination port need to match) = 0, will do rx OR tx sniff (Either source port or destination port needs to match). This is the mode used to implement rx only sniff. Default 0 Register 6 (0x06): Global Control 4 Bit 7 6 Name Reserved Switch MII halfduplex mode R/W R/W R/W = 1, enable MII interface half-duplex mode. = 0, enable MII interface full-duplex mode. Description Default 0 Pin SMRXD2 strap option. Pull-down(0): Full-duplex mode Pull-up(1): Half-duplex mode Note: SMRXD2 has internal pulldown. 5 Switch MII flow control enable R/W = 1, enable full-duplex flow control on Switch MII interface. = 0, disable full-duplex flow control on Switch MII interface. Pin SMRXD3 strap option. Pull-down(0): Disable flow control Pull- up(1): Enable flow control Note: SMRXD3 has internal pulldown. 4 Switch MII 10BT R/W = 1, the switch interface is in 10Mbps mode = 0, the switch interface is in 100Mbps mode Pin SMRXD1 strap option. Pull - down(0): Enable 100Mbps Pull-up(1): Enable 10Mpbs Note: SMRXD1 has internal pulldown. October 2008 52 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 6 (0x06): Global Control 4 (continued) Bit 3 2-0 Name Null VID replacement Broadcast storm protection rate Bit [10:8] R/W R/W R/W Description = 1, will replace NULL VID with port VID(12 bits) = 0, no replacement for NULL VID This register along with the next register determines how many "64 byte blocks" of packet data allowed on an input port in a preset period. The period is 50ms for 100BT or 500ms for 10BT. The default is 1%. 000 Default 0 Register 7 (0x07): Global Control 5 Bit 7-0 Name Broadcast storm protection rate(1) Bit [7:0] R/W R/W Description This register along with the previous register determines how many "64 byte blocks" of packet data are allowed on an input port in a preset period. The period is 67ms for 100BT or 500ms for 10BT. The default is 1%. Default 0x63 Note: Rate: 148,800 frames/sec * 67 ms/interval * 1% = 99 frames/interval (approx.) = 0x63 Register 8 (0x08): Global Control 6 Bit 7-0 Name Factory testing R/W R/W Description Reserved Default 0x4E Register 9 (0x09): Global Control 7 Bit 7-0 Name Factory testing R/W R/W Description Reserved Default 0x24 Register 10 (0x0A): Global Control 8 Bit 7-0 Name Factory testing R/W R/W Description Reserved Default 0x24 Register 11 (0x0B): Global Control 9 Bit 7 6 Name Reserved PHY power save Reserved Reserved Reserved R/W R/W Description Reserved = 1, enable PHY power save mode = 0, disable PHY power save mode R/W RW R/W Reserved Testing mode, must be 0 Reserved 0 0 1 Default 0 0 5 4 3 October 2008 53 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 11 (0x0B): Global Control 9 (continued) Bit 2 1 Name Reserved LED mode R/W R/W R/W Description Reserved This register bit sets the LEDSEL0 selection only. LEDSEL1 is set via strap-in pin. Port x LED indicators, defined as below: [LEDSEL1, LEDSEL0] [0, 0] PxLED3 PxLED2 PxLED1 PxLED0 -----LINK/ACT FULL_DPX/COL SPEED [0, 1] -----100LINK/ACT 10LINK/ACT FULL_DPX Default 0 LEDSEL0 pin value during reset. [LEDSEL1, LEDSEL0] [1, 0] PxLED3 PxLED2 PxLED1 PxLED0 Notes: LEDSEL0 is external strap-in pin #70. LEDSEL1 is external strap-in pin #23. 0 Special TPID mode R/W Used for direct mode forwarding from port 3. See description in "spanning tree" functional description. 0 = disable 1 = enable 0 ACT LINK FULL_DPX/COL SPEED [1, 1] --------------------- Register 12 (0x0C): Reserved Register Bit 7-0 Name Reserved R/W Description Reserved Default 0x00 Register 13 (0x0D): User Defined Register 1 Bit 7-0 Name UDR1 R/W R/W Description Default 0x00 Register 14 (0x0E): User Defined Register 2 Bit 7-0 Name UDR2 R/W R/W Description Default 0x00 Register 15 (0x0F): User Defined Register 3 Bit 7-0 Name UDR3 R/W R/W Description Default 0x00 October 2008 54 M9999-020606 Micrel, Inc. KSZ8993M/ML Port Registers The following registers are used to enable features that are assigned on a per port basis. The register bit assignments are the same for all ports, but the address for each port is different, as indicated. Register 16 (0x10): Port 1 Control 0 Register 32 (0x20): Port 2 Control 0 Register 48 (0x30): Port 3 Control 0 Bit 7 Name Broadcast storm protection enable DiffServ priority classification enable 802.1p priority classification enable R/W R/W Description = 1, enable broadcast storm protection for ingress packets on the port = 0, disable broadcast storm protection R/W = 1, enable DiffServ priority classification for ingress packets on port = 0, disable DiffServ function R/W = 1, enable 802.1p priority classification for ingress packets on port = 0, disable 802.1p Pin value during reset: P1_1PEN (port 1) P2_1PEN (port 2) P3_1PEN (port 3) 4 Port-based priority classification enable R/W = 1, ingress packets on the port will be classified as high priority if "DiffServ" or "802.1p" classification is not enabled or fails to classify. = 0, ingress packets on port will be classified as low priority if "DiffServ" or "802.1p" classification is not enabled or fails to classify. Note: "DiffServ", "802.1p" and port priority can be enabled at the same time. The OR'ed result of 802.1p and DSCP overwrites the port priority. 3 User priority ceiling R/W = 1, if the packet's "user priority field" is greater than the "user priority field" in the port default tag register, replace the packet's "user priority field" with the "user priority field" in the port default tag register. = 0, do not compare and replace the packet's `user priority field" 2 Tag insertion R/W = 1, when packets are output on the port, the switch will add 802.1p/q tags to packets without 802.1p/q tags when received. The switch will not add tags to packets already tagged. The tag inserted is the ingress port's "port VID". = 0, disable tag insertion Pin value during reset: P1_TAGINS (port 1) P2_TAGINS (port 2) P3_TAGINS (port 3) 0 Pin value during reset: P1_PP (port 1) P2_PP (port 2) P3_PP (port 3) 0 Default 0 6 5 October 2008 55 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 16 (0x10): Port 1 Control 0 Register 32 (0x20): Port 2 Control 0 Register 48 (0x30): Port 3 Control 0 (continued) Bit 1 Name Tag removal R/W R/W Description = 1, when packets are output on the port, the switch will remove 802.1p/q tags from packets with 802.1p/q tags when received. The switch will not modify packets received without tags. = 0, disable tag removal Default Pin value during reset: P1_TAGRM (port 1) P2_TAGRM (port 2) P3_TAGRM (port 3) 0 Priority enable R/W = 1, the port output queue is split into high and low priority queues. = 0, single output queue on the port. There is no priority differentiation even though packets are classified into high or low priority. Pin value during reset: P1_TXQ2 (port 1) P2_TXQ2 (port 2) P3_TXQ2 (port 3) Register 17 (0x11): Port 1 Control 1 Register 33 (0x21): Port 2 Control 1 Register 49 (0x31): Port 3 Control 1 Bit 7 Name Sniffer port R/W R/W Description = 1, Port is designated as sniffer port and will transmit packets that are monitored. = 0, Port is a normal port 6 Receive sniff R/W = 1, All the packets received on the port will be marked as "monitored packets" and forwarded to the designated "sniffer port" = 0, no receive monitoring 5 Transmit sniff R/W = 1, All the packets transmitted on the port will be marked as "monitored packets" and forwarded to the designated "sniffer port" = 0, no transmit monitoring 4 Double tag R/W = 1, All packets will be tagged with port default tag of ingress port regardless of the original packets are tagged or not = 0, do not double tagged on all packets 3 2-0 Reserved Port VLAN membership R/W R/W Define the port's " egress port VLAN membership. Bit 2 stands for port 3, bit 1 for port 2 bit 0 for port 1. The Port can only communicate within the membership. A `1' includes a port in the membership, a `0' excludes a port from membership. 0x0 Pin value during reset: For port 1, (PV13, PV12, 1) For port 2, (PV23, 1, PV21) For port 3, (1, PV32, PV31) 0x0 0 0 Default 0 October 2008 56 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 18 (0x12): Port 1 Control 2 Register 34 (0x22): Port 2 Control 2 Register 50 (0x32): Port 3 Control 2 Bit 7 6 Name Reserved Ingress VLAN filtering R/W R/W Description Reserved = 1, the switch will discard packets whose VID port membership in VLAN table bits [18:16] does not include the ingress port. = 0, no ingress VLAN filtering. 5 Discard non PVID packets Force flow control R/W = 1, the switch will discard packets whose VID does not match ingress port default VID. = 0, no packets will be discarded 4 R/W = 1, will always enable flow control on the port, regardless of AN result. = 0, the flow control is enabled based on AN result. Pin value during reset: For port 1, P1FFC pin For port 2, P2FFC pin For port 3, this bit has no meaning. Flow control is controlled by Reg. 6, bit 5. 3 Back pressure enable Transmit enable Receive enable 0 Learning disable R/W R/W = 1, enable port's half duplex back pressure = 0, disable port's half duplex back pressure. R/W R/W = 1, enable packet transmission on the port = 0, disable packet transmission on the port = 1, enable packet reception on the port = 0, disable packet reception on the port = 1, disable switch address learning capability = 0, enable switch address learning 0 1 Pin value during reset: BPEN pin 2 1 1 0 Default 0 0 Note: Bits [2:0] are used for spanning tree support (see page 33). Register 19 (0x13): Port 1 Control 3 Register 35 (0x23): Port 2 Control 3 Register 51 (0x33): Port 3 Control 3 Bit 7-0 Name Default tag [15:8] R/W R/W Description Port's default tag, containing Default 0x00 7-5 : User priority bits 4 : CFI bit 3-0 : VID[11:8] October 2008 57 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 20 (0x14): Port 1 Control 4 Register 36 (0x24): Port 2 Control 4 Register 52 (0x34): Port 3 Control 4 Bit 7-0 Name Default tag [7:0] R/W R/W Description Port's default tag, containing 7-0: VID[7:0] Default 0x01 Note: Registers 19 and 20 (and those corresponding to other ports) serve two purposes: 1. Associated with the ingress untagged packets, and used for egress tagging. 2. Default VID for the ingress untagged or null-VID-tagged packets, and used for address lookup. Register 21 (0x15): Port 1 Control 5 Register 37 (0x25): Port 2 Control 5 Register 53 (0x35): Port 3 Control 5 Bit 7-0 Name Transmit high priority rate control [7:0] R/W R/W Description This register along with port control 7, bits [3:0] form a 12-bits field to determine how many "32Kbps" high priority blocks can be transmitted in a unit of 4Kbytes in a one second period). Default 0x00 Register 22 (0x16): Port 1 Control 6 Register 38 (0x26): Port 2 Control 6 Register 54 (0x36): Port 3 Control 6 Bit 7-0 Name Transmit low priority rate control [7:0] R/W R/W Description This register along with port control 7, bits [7:4] form a 12-bits field to determine how many "32Kbps" low priority blocks can be transmitted in a unit of 4 Kbytes in a one second period). Default 0x00 Register 23 (0x17): Port 1 Control 7 Register 39 (0x27): Port 2 Control 7 Register 55 (0x37): Port 3 Control 7 Bit 7-4 Name Transmit low priority rate control [11:8] Transmit high priority rate control [11:8] R/W R/W Description These bits along with port control 6, bits [7:0] form a 12-bits field to determine how many "32Kbps" low priority blocks can be transmitted in a unit of 4Kbytes in a one second period). These bits along with port control 5, bits [7:0] form a 12-bits field to determine how many "32Kbps" high priority blocks can be transmitted (in a unit of 4Kbytes in a one second period). Default 0x0 3-0 R/W 0x0 Register 24 (0x18): Port 1 Control 8 Register 40 (0x28): Port 2 Control 8 Register 56 (0x38): Port 3 Control 8 Bit 7-0 Name Receive high priority rate control [7:0] R/W R/W Description This register along with port control 10, bits [3:0] form a 12-bits field to determine how many "32Kbps" high priority blocks can be received in a unit of 4Kbytes in a one second period). Default 0x00 October 2008 58 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 25 (0x19): Port 1 Control 9 Register 41 (0x29): Port 2 Control 9 Register 57 (0x39): Port 3 Control 9 Bit 7-0 Name Receive low priority rate control [7:0] R/W R/W Description This register along with port control 10, bits [7:4] form a 12-bits field to determine how many "32Kbps" low priority blocks can be received (in a unit of 4Kbytes in a one second period). Default 0x00 Register 26 (0x1A): Port 1 Control 10 Register 42 (0x2A): Port 2 Control 10 Register 58 (0x3A): Port 3 Control 10 Bit 7-4 Name Receive low priority rate control [11:8] Receive high priority rate control [11:8] R/W R/W Description These bits along with port control 9, bits [7:0] form a 12-bits field to determine how many "32Kbps" low priority blocks can be received (in a unit of 4Kbytes in a one second period). These bits along with port control 8, bits [7:0] form a 12-bits field to determine how many "32Kbps" high priority blocks can be received (in a unit of 4Kbytes in a one second period). Default 0x0 3-0 R/W 0x0 Register 27 (0x1B): Port 1 Control 11 Register 43 (0x2B): Port 2 Control 11 Register 59 (0x3B): Port 3 Control 11 Bit 7 Name Receive differential priority rate control R/W R/W Description = 1, If bit 6 is also `1' this will enable receive rate control for this port on low priority packets at the low priority rate. If bit 5 is also `1', this will enable receive rate control on high priority packets at the high priority rate. = 0, receive rate control will be based on the low priority rate for all packets on this port. 6 Low priority receive rate control enable High priority receive rate control enable R/W = 1, enable port's low priority receive rate control feature = 0, disable port's low priority receive rate control R/W = 1, If bit 7 is also `1' this will enable the port's high priority receive rate control feature. If bit 7 is a `0' and bit 6 is a `1', all receive packets on this port will be rate controlled at the low priority rate. = 0, disable port's high priority receive rate control feature 4 Low priority receive rate flow control enable R/W = 1, flow control may be asserted if the port's low priority receive rate is exceeded. = 0, flow control is not asserted if the port's low priority receive rate is exceeded. 0 0 0 Default 0 5 October 2008 59 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 27 (0x1B): Port 1 Control 11 Register 43 (0x2B): Port 2 Control 11 Register 59 (0x3B): Port 3 Control 11 (continued Bit 3 Name High priority receive rate flow control enable R/W R/W Description = 1, flow control may be asserted if the port's high priority receive rate is exceeded. (To use this, differential receive rate control must be on.) = 0, flow control is not asserted if the port's high priority receive rate is exceeded. 2 Transmit differential priority rate control R/W = 1, will do transmit rate control on both high and low priority packets based on the rate counters defined by the high and low priority packets respectively. = 0, will do transmit rate control on any packets. The rate counters defined in low priority will be used. 1 Low priority transmit rate control enable High priority transmit rate control enable R/W 1, enable the port's low priority transmit rate control feature = 0, disable the port's low priority transmit rate control feature R/W = 1, enable the port's high priority transmit rate control feature = 0, disable the port's high priority transmit rate control feature 0 0 0 Default 0 0 Note: Port Control 12 and 13, and Port Status 0 contents can also be accessed with the MIIM (MDC/MDIO) interface via the Standard MIIM registers. Register 28 (0x1C): Port 1 Control 12 Register 44 (0x2C): Port 2 Control 12 Register 60 (0x3C): Reserved, not applied to port 3 Bit 7 Name Auto negotiation enable R/W R/W Description = 0, disable auto negotiation, speed and duplex are decided by bit 6 and 5 of the same register. = 1, auto negotiation is on Default For port 1, P1ANEN pin value during reset. For port 2, P2ANEN pin value during reset 6 Force speed R/W = 1, forced 100BT if AN is disabled (bit 7) = 0, forced 10BT if AN is disabled (bit 7) For port 1, P1SPD pin value during reset. For port 2, P2SPD pin value during reset. October 2008 60 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 28 (0x1C): Port 1 Control 12 Register 44 (0x2C): Port 2 Control 12 Register 60 (0x3C): Reserved, not applied to port 3 (continued) Bit 5 Name Force duplex R/W R/W Description = 1, forced full duplex if (1) AN is disabled or (2) AN is enabled but failed. = 0, forced half duplex if (1) AN is disabled or (2) AN is enabled but failed. Default For port 1, P1DPX pin value during reset. For port 2, P2DPX pin value during reset. 4 Advertised flow control capability Advertised 100BT fullduplex capability Advertised 100BT halfduplex capability Advertised 10BT fullduplex capability Advertised 10BT halfduplex capability R/W = 1, advertise flow control (pause) capability = 0, suppress flow control (pause) capability from transmission to link partner R/W = 1, advertise 100BT full-duplex capability = 0, suppress 100BT full-duplex capability from transmission to link partner R/W = 1, advertise 100BT half-duplex capability = 0, suppress 100BT half-duplex capability from transmission to link partner R/W = 1, advertise 10BT full-duplex capability = 0, suppress 10BT full-duplex capability from transmission to link partner R/W = 1, advertise 10BT half-duplex capability = 0, suppress 10BT half-duplex capability from transmission to link partner 1 1 1 ADVFC pin value during reset. 1 3 2 1 0 Register 29 (0x1D): Port 1 Control 13 Register 45 (0x2D): Port 2 Control 13 Register 61 (0x3D): Reserved, not applied to port 3 Bit 7 Name LED off R/W R/W Description = 1, Turn off all port's LEDs (LEDx_3, LEDx_2, LEDx_1, LEDx_0, where "x" is the port number). These pins will be driven high if this bit is set to one. = 0, normal operation 6 5 Txids Restart AN R/W R/W = 1, disable port's transmitter = 0, normal operation = 1, restart auto-negotiation = 0, normal operation 0 0 Default 0 October 2008 61 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 29 (0x1D): Port 1 Control 13 Register 45 (0x2D): Port 2 Control 13 Register 61 (0x3D): Reserved, not applied to port 3 (continued) Bit 4 Name Disable far end fault R/W R/W Description = 1, disable far end fault detection and pattern transmission. = 0, enable far end fault detection and pattern transmission Default 0 Note: Only port 1 supports fiber. This bit is applicable to port 1 only. 0 0 For port 2, P2MDIX disable pin value during reset. 0 For port 2, P2MDIX pin value during reset. 0 3 2 Power-down Disable auto MDI/MDI-X R/W R/W = 1, power-down = 0, normal operation = 1, disable auto MDI/MDI-X function = 0, enable auto MDI/MDI-X function 1 Force MDI-X R/W If auto MDI/MDI-X is disabled, = 1, force PHY into MDI mode (transmit on RXP/RXM pins) 0 Loopback R/W = 0, force PHY into MDI-X mode (transmit on TXP/TXM pins) = 1, perform loopback, as indicated: Port 1 Loopback (reg. 29, bit 0 = `1') Start: RXP2/RXM2 (port 2) Loopback: PMD/PMA of port 1's PHY End: TXP2/TXM2 (port 2) Port 2 Loopback (reg. 45, bit 0 `1') Start: RXP1/RXM1 (port 1) Loopback: PMD/PMA of port 2's PHY End: TXP1/TXM1 (port 1) = 0, normal operation Register 30 (0x1E): Port 1 Status 0 Register 46 (0x2E): Port 2 Status 0 Register 62 (0x3E): Reserved, not applied to port 3 Bit 7 6 5 4 Name MDI-X status AN done Link good Partner flow control capability R/W RO RO RO RO Description = 1, MDI-X = 0, MDI = 1, AN done = 0, AN not done = 1, link good = 0, link not good = 1, link partner flow control (pause) capable = 0, link partner not flow control (pause) capable 0 Default 0 October 2008 62 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 30 (0x1E): Port 1 Status 0 Register 46 (0x2E): Port 2 Status 0 Register 62 (0x3E): Reserved, not applied to port 3 (continued) Bit 3 Name Partner 100BT full-duplex capability Partner 100BT half-duplex capability Partner 10BT full-duplex capability Partner 10BT half-duplex capability R/W RO Description = 1, link partner 100BT full-duplex capable = 0, link partner not 100BT full-duplex capable RO = 1, link partner 100BT half-duplex capable = 0, link partner not 100BT half-duplex capable RO = 1, link partner 10BT full-duplex capable = 0, link partner not 10BT full-duplex capable RO = 1, link partner 10BT half-duplex capable = 0, link partner not 10BT half-duplex capable 0 0 0 Default 0 2 1 0 Register 31 (0x1F): Port 1 Status 1 Register 47 (0x2F): Port 2 Status 1 Register 63 (0x3F): Port 3 Status 1 Bit 7 6-5 4 3 2 1 0 Name Reserved Reserved Receive flow control enable Transmit flow control enable Operation speed Operation duplex Far end fault R/W RO RO RO RO RO RO RO 1 = receive flow control feature is active 0 = receive flow control feature is inactive 1 = transmit flow control feature is active 0 = transmit flow control feature is inactive 1 = link speed is 100Mbps 0 = link speed is 10Mbps 1 = link duplex is full 0 = link duplex is half = 1, far end fault status detected = 0, no far end fault status detected 0 Note: only port 1 supports fiber; this bit is applicable to port 1 only. 0 0 0 Description Default 0 00 0 October 2008 63 M9999-020606 Micrel, Inc. KSZ8993M/ML Advanced Control Registers The IPv4 TOS priority control registers implement a fully decoded 64 bit differentiated services code point (DSCP) register used to determine priority from the 6 bit TOS field in the IP header. The most significant 6 bits of the TOS field are fully decoded into 64 possibilities, and the singular code that results is compared against the corresponding bit in the DSCP register. f the register bit is a 1, the priority is high; if it is a 0, the priority is low. Register 96 (0x60): TOS Priority Control Register 0 Bit 7-0 Name DSCP[63:56] R/W R/W Description Default 0000_0000 Register 97 (0x61): TOS Priority Control Register 1 Bit 7-0 Name DSCP[55:48] R/W R/W Description Default 0000_0000 Register 98 (0x62): TOS Priority Control Register 2 Bit 7-0 Name DSCP[47:40] R/W R/W Description Default 0000_0000 Register 99 (0x63): TOS Priority Control Register 3 Bit 7-0 Name DSCP[39:32] R/W R/W Description Default 0000_0000 Register 100 (0x64): TOS Priority Control Register 4 Bit 7-0 Name DSCP[31:24] R/W R/W Description Default 0000_0000 Register 101 (0x65): TOS Priority Control Register 5 Bit 7-0 Name DSCP[23:16] R/W R/W Description Default 0000_0000 Register 102 (0x66): TOS Priority Control Register 6 Bit 7-0 Name DSCP[15:8] R/W R/W Description Default 0000_0000 Register 103 (0x67): TOS Priority Control Register 7 Bit 7-0 Name DSCP[7:0] R/W R/W Description Default 0000_0000 October 2008 64 M9999-020606 Micrel, Inc. KSZ8993M/ML Registers 104 to 109 Registers 104 to 109 define the switching engine's MAC address. This 48-bit address is used as the SA for MAC pause control frames. Register 104 (0x68): MAC Address Register 0 Bit 7-0 Name MACA[47:40] R/W R/W Description Default 0x00 Register 105 (0x69): MAC Address Register 1 Bit 7-0 Name MACA[39:32] R/W R/W Description Default 0x10 Register 106 (0x6A): MAC Address Register 2 Bit 7-0 Name MACA[31:24] R/W R/W Description Default 0xA1 Register 107 (0x6B): MAC Address Register 3 Bit 7-0 Name MACA[23:16] R/W R/W Description Default 0xFF Register 108 (0x6C): MAC Address Register 4 Bit 7-0 Name MACA[15:8] R/W R/W Description Default 0xFF Register 109 (0X6D): MAC Address Register 5 Bit 7-0 Name MACA[7:0] R/W R/W Description Default 0xFF October 2008 65 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 110 and 111 Use registers 110 and 111 to read or write data to the static MAC address table, VLAN table, dynamic address table, or the MIB counters. Register 110 (0x6E): Indirect Access Control 0 Bit 7-5 4 3-2 Name Reserved Read high Write low Table select R/W R/W R/W R/W Description Reserved = 1, read cycle = 0, write cycle 00 = static MAC address table selected 01 = VLAN table selected 10 = dynamic address table selected 11 = MIB counter selected 1-0 Indirect address high R/W Bit 9-8 of indirect address 00 00 Default 000 0 Register 111 (0x6F): Indirect Access Control 1 Bit 7-0 Name Indirect address low R/W R/W Description Bit 7-0 of indirect address Default 0000_0000 Note: Write to register 111 will actually trigger a command. Read or write access is determined by Register 110 bit 4. Register 112 (0x70): Indirect Data Register 8 Bit 68-64 Name Indirect data R/W R/W Description Bit 68-64 of indirect data Default 0_0000 Register 113 (0x71): Indirect Data Register 7 Bit 63-56 Name Indirect data R/W R/W Description Bit 63-56 of indirect data Default 0000_0000 Register 114 (0x72): Indirect Data Register 6 Bit 55-48 Name Indirect data R/W R/W Description Bit 55-48 of indirect data Default 0000_0000 Register 115 (0x73): Indirect Data Register 5 Bit 47-40 Name Indirect data R/W R/W Description Bit 47-40 of indirect data Default 0000_0000 Register 116 (0x74): Indirect Data Register 4 Bit 39-32 Name Indirect data R/W R/W Description Bit 39-32 of indirect data Default 0000_0000 October 2008 66 M9999-020606 Micrel, Inc. KSZ8993M/ML Register 117 (0x75): Indirect Data Register 3 Bit 31-24 Name Indirect data R/W R/W Description Bit of 31-24 of indirect data Default 0000_0000 Register 118 (0x76): Indirect Data Register 2 Bit 23-16 Name Indirect data R/W R/W Description Bit 23-16 of indirect data Default 0000_0000 Register 119 (0x77): Indirect Data Register 1 Bit 15-8 Name Indirect data R/W R/W Description Bit 15-8 of indirect data Default 0000_0000 Register 120 (0x78): Indirect Data Register 0 Bit 7-0 Name Indirect data R/W R/W Description Bit 7-0 of indirect data Default 0000_0000 Registers 121 to 127 Registers 121 to 127 are Reserved. Static MAC Address Table The KSZ8993M has both a static and a dynamic MAC address table. When a destination address (DA) lookup is requested, both tables are searched to make a packet forwarding decision. When a SA lookup is requested, only the dynamic table is searched for aging, migration and learning purposes. The static DA lookup result will have precedence over the dynamic DA lookup result. If there is a DA match in both tables, the result from the static table will be used. The static table can be accessed and controlled by an external processor via the SMI, SPI and I2C interfaces. The external processor performs all addition, modification and deletion of static table entries. These entries in the static table will not be aged out by the KSZ8993M. Bit 57-54 53 52 Name FID Use FID Override R/W R/W R/W R/W Description Filter VLAN ID, representing one of the 16 active VLANs = 1, use (FID+MAC) to look up in static table = 0, use MAC only to look up in static table = 1, override port setting "transmit enable=0" or "receive enable=0" setting = 0, no override 51 Valid R/W = 1, this entry is valid, the lookup result will be used = 0, this entry is not valid Table 12. Format of Static MAC Table (8 Entries) 0 0 Default 0000 0 October 2008 67 M9999-020606 Micrel, Inc. KSZ8993M/ML Bit 50-48 Name Forwarding ports R/W R/W Description These 3 bits control the forwarding port(s): 001, forward to port 1 010, forward to port 2 100, forward to port 3 011, forward to port 1 and port 2 110, forward to port 2 and port 3 101, forward to port 1 and port 3 111, broadcasting (excluding the ingress port) Default 000 47-0 MAC address R/W 48 bits MAC address 0x0000_0000_0000 Table 12. Format of Static MAC Table (8 Entries) (continued) Examples: 1. Static Address Table Read (Read the 2nd Entry) Write to reg. 110 with 0x10 (read static table selected) Write to reg. 111 with 0x01 (trigger the read operation) Then, Read reg. 113 (57-56) Read reg. 114 (55-48) Read reg. 115 (47-40) Read reg. 116 (39-32) Read reg. 117 (31-24) Read reg. 118 (23-16) Read reg. 119 (15-8) Read reg. 120 (7-0) 2. Static Address Table Write (Write the 8th Entry) Write reg. 113 (57-56) Write reg. 114 (55-48) Write reg. 115 (47-40) Write reg. 116 (39-32) Write reg. 117 (31-24) Write reg. 118 (23-16) Write reg. 119 (15-8) Write reg. 120 (7-0) Write to reg. 110 with 0x00 (write static table selected) Write to reg. 111 with 0x07 (trigger the write operation) VLAN Table VLAN table is used to do VLAN table lookup. If 802.1Q VLAN mode is enabled (Register 5, Bit 7 = 1), this table will be used to retrieve the VLAN information that is associated with the ingress packet. This information includes FID (filter ID), VID (VLAN ID), and VLAN membership as described in the following table. October 2008 68 M9999-020606 Micrel, Inc. KSZ8993M/ML Bit 19 18-16 Name Valid Membership R/W R/W R/W Description = 1, the entry is valid = 0, entry is invalid Specify which ports are members of the VLAN. If a DA lookup fails (no match in both static and dynamic tables), then the packet associated with this VLAN will be forwarded to ports specified in this field. For example, 101 means port 3 and 1 are in this VLAN. Filter ID. KSZ8993M supports 16 active VLANs represented by these four bit fields. FID is the mapped ID. If 802.1Q VLAN is enabled, the lookup will be based on FID+DA and FID+SA. IEEE 802.1Q 12 bits VLAN ID Default 1 111 15-12 FID R/W 0x0 11-0 VID R/W 0x001 Table 13. Format of Static VLAN Table (16 Entries) If 802.1Q VLAN mode is enabled, KSZ8993M will assign a VID to every ingress packet. If the packet is untagged or tagged with a null VID, the packet is assigned with the default port VID of the ingress port. If the packet is tagged with non null VID, the VID in the tag will be used. The lookup process will start from the VLAN table lookup. If the VID is not valid, the packet will be dropped and no address learning will take place. If the VID is valid, the FID is retrieved. The FID+DA and FID+SA lookups are performed. The FID+DA lookup determines the forwarding ports. If FID+DA fails, the packet will be broadcast to all the members (excluding the ingress port) of the VLAN. If FID+SA fails, the FID+SA will be learned. Examples: 1. VLAN Table Read (read the 3rd entry) Write to reg. 110 with 0x14 (read VLAN table selected) Write to reg. 111 with 0x02 (trigger the read operation) Then Read reg. 118 (VLAN table bits 19-16) Read reg. 119 (VLAN table bits 15-8) Read reg. 120 (VLAN table bits 7-0) 2. VLAN Table Write (write the 7th entry) Write to reg. 118 (VLAN table bits 19-16) Write to reg. 119 (VLAN table bits 15-8) Write to reg. 120 (VLAN table bits 7-0) Write to reg. 110 with 0x04 (write VLAN table selected) Write to reg. 111 with 0x06 (trigger the write operation) Dynamic MAC Address Table This table is read only. The table contents are maintained by KSZ8993M only. Bit 71 Name Data not ready R/W RO Description = 1, entry is not ready, retry until this bit is set to 0 = 0, entry is ready 70-67 Reserved RO Reserved Default Table 14. Format of Dynamic MAC Address Table (1K Entries) October 2008 69 M9999-020606 Micrel, Inc. KSZ8993M/ML Bit 66 65-56 Name MAC empty No of valid entries R/W RO RO Description = 1, there is no valid entry in the table = 0, there are valid entries in the table Indicates how many valid entries in the table 0x3ff means 1 K entries 0x001 means 2 entries 0x000 and bit 66 = 0 means 1 entry 0x000 and bit 66 = 1 means 0 entry Default 1 00_0000_0000 55-54 53-52 Time stamp Source port RO RO 2 bits counter for internal aging The source port where FID+MAC is learned 00, port 1 01, port 2 10, port 3 00 51-48 47-0 FID MAC address RO RO Filter ID 48 bits MAC address 0x0 0x0000_0000_0000 Table 14. Format of Dynamic MAC Address Table (1K Entries) (continued) Example: Dynamic MAC Address Table Read (read the 1st entry and retrieve the MAC table size) Write to reg. 110 with 0x18 (read dynamic table selected) Write to reg. 111 with 0x00 (trigger the read operation) Then Read reg. 112 (71-64) // if bit 71 = 1, restart (reread) from this register Read reg. 113 (63-56) Read reg. 114 (55-48) Read reg. 115 (47-40) Read reg. 116 (39-32) Read reg. 117 (31-24) Read reg. 118 (23-16) Read reg. 119 (15-8) Read reg. 120 (7-0) MIB (Management Information Base) Counters The KSZ8993M provides 34 MIB counters per port. These counters are used to monitor the port activity for network management. The MIB counters have two format groups: "Per Port" and "All Port Dropped Packet." Bit 31 30 29-0 Name Reserve Count valid Counter values R/W RO RO RO Description Reserve = 1, counter value is valid = 0, counter value is not valid Counter value 0 Default 0 0 Table 15. Format of "Per Port" MIB Counters "Per Port" MIB counters are read using indirect memory access. The base address offsets and address ranges for all three ports are: Port 1, base is 0x00 and range is (0x00-0x1f) Port 2, base is 0x20 and range is (0x20-0x3f) Port 3, base is 0x40 and range is (0x40-0x5f) October 2008 70 M9999-020606 Micrel, Inc. KSZ8993M/ML Port 1's "Per Port" MIB Counters Indirect Memory Offsets are shown in the following table. Offset 0x0 0x1 0x2 0x3 0x4 0x5 0x6 0x7 0x8 0x9 0xA Counter Name RxLoPriorityByte RxHiPriorityByte RxUndersizePkt RxFragments RxOversize RxJabbers RxSymbolError RxCRCError RxAlignmentError RxControl8808Pkts RxPausePkts Description Rx lo-priority (default) octet count including bad packets Rx hi-priority octet count including bad packets Rx undersize packets w/ good CRC Rx fragment packets w/ bad CRC, symbol errors or alignment errors Rx oversize packets w/ good CRC (max: 1536 or 1522 bytes) Rx packets longer than 1522 bytes w/ either CRC errors, alignment errors, or symbol errors (depends on max packet size setting) Rx packets w/ invalid data symbol and legal packet size. Rx packets within (64,1522) bytes w/ an integral number of bytes and a bad CRC (upper limit depends on max packet size setting) Rx packets within (64,1522) bytes w/ a non-integral number of bytes and a bad CRC (upper limit depends on max packet size setting) Number of MAC control frames received by a port with 88-08h in EtherType field Number of PAUSE frames received by a port. PAUSE frame is qualified with EtherType (88-08h), DA, control opcode (00-01), data length (64B min), and a valid CRC Rx good broadcast packets (not including error broadcast packets or valid multicast packets) Rx good multicast packets (not including MAC control frames, error multicast packets or valid broadcast packets) Rx good unicast packets Total Rx packets (bad packets included) that were 64 octets in length Total Rx packets (bad packets included) that are between 65 and 127 octets in length Total Rx packets (bad packets included) that are between 128 and 255 octets in length Total Rx packets (bad packets included) that are between 256 and 511 octets in length Total Rx packets (bad packets included) that are between 512 and 1023 octets in length Total Rx packets (bad packets included) that are between 1024 and 1522 octets in length (upper limit depends on max packet size setting) Tx lo-priority good octet count, including PAUSE packets Tx hi-priority good octet count, including PAUSE packets The number of times a collision is detected later than 512 bit-times into the Tx of a packet Number of PAUSE frames transmitted by a port Tx good broadcast packets (not including error broadcast or valid multicast packets) Tx good multicast packets (not including error multicast packets or valid broadcast packets) Tx good unicast packets Table 16. Port 1s "Per Port" MIB Counters Indirect Memory Offsets 0xB 0xC 0xD 0xE 0xF 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1A RxBroadcast RxMulticast RxUnicast Rx64Octets Rx65to127Octets Rx128to255Octets Rx256to511Octets Rx512to1023Octets Rx1024to1522Octets TxLoPriorityByte TxHiPriorityByte TxLateCollision TxPausePkts TxBroadcastPkts TxMulticastPkts TxUnicastPkts October 2008 71 M9999-020606 Micrel, Inc. KSZ8993M/ML Offset 0x1B 0x1C 0x1D 0x1E 0x1F Counter Name TxDeferred TxTotalCollision TxExcessiveCollision TxSingleCollision TxMultipleCollision Description Tx packets by a port for which the 1st Tx attempt is delayed due to the busy medium Tx total collision, half duplex only A count of frames for which Tx fails due to excessive collisions Successfully Tx frames on a port for which Tx is inhibited by exactly one collision Successfully Tx frames on a port for which Tx is inhibited by more than one collision Table 17. Port 1's "Per Port" MIB Counters Indirect Memory Offsets Bit 30-16 15-0 Name Reserved Counter values R/W N/A RO Description Reserved Counter value Default N/A 0 Table 18. Format of "All Port Dropped Packet" MIB Counters "All Port Dropped Packet" MIB counters are read using indirect memory access. The address offsets for these counters are shown in the following table: Offset 0x100 0x101 0x102 0x103 0x104 0x105 Counter Name Port1 TX Drop Packets Port2 TX Drop Packets Port3 TX Drop Packets Port1 RX Drop Packets Port2 RX Drop Packets Port3 RX Drop Packets Description TX packets dropped due to lack of resources TX packets dropped due to lack of resources TX packets dropped due to lack of resources RX packets dropped due to lack of resources RX packets dropped due to lack of resources RX packets dropped due to lack of resources Table 19. "All Port Dropped Packet" MIB Counters Indirect Memory Offsets Examples: 1. MIB Counter Read (Read port 1 "Rx64Octets" Counter) Write to reg. 110 with 0x1c (read MIB counters selected) Write to reg. 111 with 0x0e (trigger the read operation) Then Read reg. 117 (counter value 30-24) // If bit 30 = 0, restart (reread) from this register Read reg. 118 (counter value 23-16) Read reg. 119 (counter value 15-8) Read reg. 120 (counter value 7-0) 2. MIB Counter Read (Read Port 2 "Rx64Octets" Counter) Write to reg. 110 with 0x1c (read MIB counter selected) Write to reg. 111 with 0x2e (trigger the read operation) October 2008 72 M9999-020606 Micrel, Inc. KSZ8993M/ML Then, Read reg. 117 (counter value 30-24) // If bit 30 = 0, restart (reread) from this register Read reg. 118 (counter value 23-16) Read reg. 119 (counter value 15-8) Read reg. 120 (counter value 7-0) 3. MIB Counter Read (Read "Port1 TX Drop Packets" Counter) Write to reg. 110 with 0x1d (read MIB counter selected) Write to reg. 111 with 0x00 (trigger the read operation) Then Read reg. 119 (counter value 15-8) Read reg. 120 (counter value 7-0) Additional Information Both "Per Port" and "All Port Dropped Packet" MIB counters do not indicate overflow. The application must keep track of overflow conditions for these counters. "All Port Dropped Packet" MIB counters do not indicate if count is valid. The application must keep track of valid conditions for these counters. To read out all the counters, the best performance over the SPI bus is (160+3)*8*200 = 260ms, where there are 160 registers, 3 overheads, 8 clocks per access, at 5MHz. In the heaviest condition, the counters will overflow in 2 minutes. It is recommended that the software read all the counters at least every 30 seconds. A high performance SPI master is also recommended to prevent counters overflow. Per Port MIB counters are designed as "read clear." That is, these counters will be cleared after they are read. "All Port Dropped Packet" MIB counters are not cleared after they are read. October 2008 73 M9999-020606 Micrel, Inc. KSZ8993M/ML Absolute Maximum Ratings(1) Description Supply Storage Supply Voltage Pins N/A VDDA, VDDAP, VDDC VDDATX, VDDARX, VDDIO Input Voltage (all inputs) Output Voltage (all outputs Lead Temperature (soldering, 10 sec) Storage Temperature (Ts) Note: 1. Exceeding the absolute maximum rating may damage the device. Value -55C to 150C -0.5V to 2.4V -0.5V to 4.0V -0.5V to 4.0V -0.5V to 4.0V All Inputs All Outputs N/A N/A -55C to 150C Stresses greater than those listed in the table above may cause permanent damage to the device. Operation of the device at these or any other conditions above those specified in the operating sections of this specification is not implied. Maximum conditions for extended periods may affect reliability. Unused inputs must always be tied to an appropriate logic voltage level. Operating Ratings(1) Parameter Supply Voltages Symbol VDDA,VDDAP,VDDC VDDATX,VDDARX, VDDIO Ambient Operating Temperature (M, ML) Ambient Operating Temperature (MI, MLI) Maximum Junction Temperature Thermal Resistance Junction to (2) Ambient Notes: 1. The device is not guaranteed to function outside its operating rating. Unused inputs must always be tied to an appropriate logic voltage level (Ground to VDD). 2. No (HS) heat spreader in this package. Min 1.710V 3.135V 0C -40C Typ 1.8V 3.3V Max 1.890V 3.465V 70C 85C 125C TA TA TJ JA 32C/W October 2008 74 M9999-020606 Micrel, Inc. KSZ8993M/ML Electrical Characteristics(1) VIN = xx; RL =xx; TA = 25C, bold values indicate -40C< TA < +85C; unless noted. Parameter Symbol Condition Min Typ Max Supply Current (including TX output driver current, KSZ8993M device only) 100BASE-TX Operation (All Ports@100% Utilization) 100BASE-TX (analog core + PLL + digital core) 100BASE-TX (transceiver + digital I/O) Iddc Iddxio VDDA, VDDAP, VDDC = 1.8V VDDATX, VDDARX, VDDIO = 3.3V 10BASE-T Operation (All Ports@100% Utilization) 92mA 33mA 10BASE-T (analog core + PLL + digital core) 10BASE-T (transceiver + digital I/O) TTL Inputs Input High Voltage Input Low Voltage Input Current TTL Outputs Output High Voltage Output Low Voltage Output Tri-State Leakage Iddc Iddxio VDDA, VDDAP, VDDC = 1.8V VDDATX, VDDARX, VDDIO = 3.3V 66mA 35mA Vih Vil Iin Vin = GND ~ VDDIO 2.0V 0.8V -10A 10A Voh Vol |Ioz| Ioh = -8 mA Iol = 8 mA 2.4V 0.4V 10A 100BASE-TX Transmit (measured differentially after 1:1 transformer) Peak Differential Output Voltage Output Voltage Imbalance Rise/Fall Time Rise/Fall Time Imbalance 100BASE-TX Transmit (measured differentially after 1:1 transformer) Duty Cycle Distortion Overshoot Reference Voltage of ISET Output Jitters Note: 1. Specification for packaged product only. Vo Vimb Tr/Tf 100 termination on the differential output. 100 termination on the differential output 0.95V 1.05V 2% 3ns 0ns 5ns 0.5ns + 0.5ns 5% Vset Peak-to-peak 0.5V 0.7ns 1.4ns October 2008 75 M9999-020606 Micrel, Inc. KSZ8993M/ML Electrical Characteristics (continued)(1) Parameter 10BaseT Receive Squelch Threshold Vsq 5MHz square wave 400mV Symbol Condition Min Typ Max 10BaseT Transmit (measured differentially after 1:1 transformer) VDDATX = 3.3V only Peak Differential Output Voltage Jitters Added Rise/Fall Time Note: 1. Specification for packaged product only. Vp 100 termination on the differential output. 100 termination on the differential output. 2.3V + 3.5ns 25ns October 2008 76 M9999-020606 Micrel, Inc. KSZ8993M/ML Timing Specifications EEPROM Timing Figure 13. EEPROM Interface Input Timing Diagram Figure 14. EEPROM Interface Output Timing Diagram Timing Parameter tcyc1 ts1 th1 tov1 Description Clock cycle Setup time Hold time Output valid Min Typ 16384 Max Unit ns ns ns 20 20 4096 4112 4128 ns Table 20. EEPROM Timing Parameters October 2008 77 M9999-020606 Micrel, Inc. KSZ8993M/ML SNI Timing Figure 15. SNI Input Timing Diagram Figure 16. SNI Output Timing Diagram Timing Parameter tcyc2 ts2 th2 tov2 Description Clock cycle Setup time Hold time Output valid Min Typ 100 Max Unit ns ns ns 10 0 0 3 6 ns Table 21. SNI Timing Parameters October 2008 78 M9999-020606 Micrel, Inc. KSZ8993M/ML MII Timing MAC Mode MII Timing Figure 17. MAC-Mode MII Timing - Data Received from MII Figure 18. MAC-Mode MII Timing - Data Input to MII Timing Parameter tcyc3 (100BASE-T) tcyc3 (10BASE-T) ts3 th3 tov3 Description Clock cycle 100BASE-T Clock cycle 10BASE-T Setup time Hold time Output valid Min Typ 40 400 Max Unit ns ns ns ns 10 10 0 25 ns Table 22. MAC-Mode MII Timing Parameters October 2008 79 M9999-020606 Micrel, Inc. KSZ8993M/ML PHY-Mode MII Timing Figure 19. PHY-Mode MII Timing - Data Received from MII Figure 20. PHY-Mode MII Timing - Data Input to MII Timing Parameter tcyc4 (100BASE-T) tcyc4 (10BASE-T) ts4 th4 tov4 Description Clock cycle 100BASE-T Clock cycle 10BASE-T Setup time Hold time Output valid Min Typ 40 400 Max Unit ns ns ns ns 10 10 0 25 ns Table 23. PHY-Mode MII Timing Parameters October 2008 80 M9999-020606 Micrel, Inc. KSZ8993M/ML SPI Timing Input Timing Figure 21. SPI Input Timing Timing Parameter fC tCHSL tSLCH tCHSH tSHCH tSHSL tDVCH tCHDX tCLCH tCHCL tDLDH tDHDL Description Clock frequency SPIS_N inactive hold time SPIS_N active setup time SPIS_N active old time SPIS_N inactive setup time SPIS_N deselect time Data input setup time Data input hold time Clock rise time Clock fall time Data input rise time Data input fall time Min Max 5 Units MHz ns ns ns ns ns ns ns 90 90 90 90 100 20 30 1 1 1 1 us us us us Table 24. SPI Input Timing Parameters October 2008 81 M9999-020606 Micrel, Inc. KSZ8993M/ML Output Timing Figure 22. SPI Output Timing Timing Parameter fC tCLQX tCLQV tCH tCL tQLQH tQHQL tSHQZ Description Clock frequency SPIQ hold time Clock low to SPIQ valid Clock high time Clock low time SPIQ rise time SPIQ fall time SPIQ disable time Min Max 5 Units MHz ns ns ns 0 0 60 90 90 50 50 100 ns ns ns Table 25. SPI Output Timing Parameters October 2008 82 M9999-020606 Micrel, Inc. KSZ8993M/ML Reset Timing As long as the stable supply voltages to reset high timing (minimum of10ms) are met, there is no power sequencing requirement for the KSZ8993M supply voltages (1.8V, 3.3). It is recommended to wait 100sec after the de-assertion of reset before starting programming on the managed interface. The reset timing requirement is summarized in the following figure and table. Figure 23. Reset Timing Parameter tsr tcs tch trc Description Stable supply voltages to reset high Configuration setup time Configuration hold time Reset to strap-in pin output Min 10 50 50 50 Max Units ms ns ns us Table 26. Reset Timing Parameters Reset Circuit Diagram Micrel recommends the following discrete reset circuit as shown in Figure 24 when powering up the KSZ8893M/ML/MI device. For the application where the reset circuit signal comes from another device (e.g., CPU, FPGA, etc), we recommend the reset circuit as shown in Figure 25. October 2008 83 M9999-020606 Micrel, Inc. KSZ8993M/ML Figure 24. Recommended Reset Circuit Figure 25. Recommended Circuit for Interfacing with CPU/FPGA Reset At power-on-reset, R, C, and D1 provide the necessary ramp rise time to reset the Micrel device. The reset out from CPU/FPGA provides warm reset after power up. It is also recommended to power up the VDD core voltage earlier than VDDIO voltage. At worst case, the both VDD core and VDDIO voltages should come up at the same time. October 2008 84 M9999-020606 Micrel, Inc. KSZ8993M/ML Selection of Isolation Transformers A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode choke is recommended for exceeding FCC requirements. The following table gives recommended transformer characteristics. Parameter Turns ratio Open-circuit inductance (min.) Leakage inductance (max.) Inter-winding capacitance (max.) D.C. resistance (max.) Insertion loss (max.) HIPOT (min.) Value 1 CT : 1 CT 350H 0.4H 12pF 0.9 1.0dB 1500Vrms Test Condition 100mV, 100kHz, 8mA 1MHz (min.) 0MHz - 65MHz Table 27. Transformer Selection Criteria Magnetic Manufacturer Bel Fuse Bel Fuse Bel Fuse Delta LanKom Pulse Pulse (low cost) Transpower YCL Part Number S558-5999-U7 SI-46001 SI-50170 LF8505 LF-H41S H1102 H1260 HB726 LF-H41S Auto MDI-X Yes Yes Yes Yes Yes Yes Yes Yes Yes Number of Port 1 1 1 1 1 1 1 1 1 Table 28. Qualified Single Port Magnetics Selection of Reference Crystal Chacteristics Frequency Frequency tolerance (max) Load capacitance (max) Series resistance Value 25.00000 50 20 25 Units MHz ppm pF Table 29. Typical Reference Crystal Characteristics October 2008 85 M9999-020606 Micrel, Inc. KSZ8993M/ML Package Information 128-Pin PQFP Package MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL: +1 (408) 944-0800 FAX: +1 (408) 474 1000 WEB: http:/www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2003 Micrel, Incorporated. October 2008 86 M9999-020606 |
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