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ksz8041nl/rnl 10base-t/100base-tx physical layer transceiver data sheet rev. 1.4 micro leadframe and mlf are registered trademarks of amkor technology, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com september 2010 m9999-090910-1.4 general description the ksz8041nl is a single supply 10base-t/100base-tx physical layer transceiver, which provides mii/rmii interfaces to transmit and receive data. a unique mixed signal design extends signaling distance while reducing power consumption. hp auto mdi/mdi-x provides the most robust solution for eliminating the need to differentiate between crossover and straight-through cables. the ksz8041nl represents a new level of features and performance and is an ideal choice of physical layer transceiver for 10base-t/1 00base-tx applications. the ksz8041rnl is an enhanced rmii version of the ksz8041nl that does not requi re a 50mhz system clock. it uses a 25mhz crystal for its input reference clock and outputs a 50mhz rmii reference clock to the mac. the ksz8041nl and ksz8041rnl are available in 32- pin, lead-free mlf? (qfn per jdec) packages (see ordering information). data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . functional diagram ksz8041nl ksz8041rnl
micrel, inc. ksz8041nl/rnl september 2010 2 m9999-090910-1.4 features ? single-chip 10base-t/100base-tx physical layer solution ? fully compliant to ieee 802.3u standard ? low power cmos design, power consumption of <180mw ? hp auto mdi/mdi-x for reliable detection and correction for straight-thr ough and crossover cables with disable and enable option ? robust operation over standard cables ? power down and power saving modes ? mii interface support (ksz8041nl only) ? rmii interface support with external 50mhz system clock (ksz8041nl only) ? rmii interface support with 25mhz crystal/clock input and 50mhz reference clock output to mac (ksz8041rnl only) ? miim (mdc/mdio) management bus to 6.25mhz for rapid phy register configuration ? interrupt pin option ? programmable led outputs for link, activity and speed ? esd rating (6kv) ? single power supply (3.3v) ? built-in 1.8v regulator for core ? available in 32-pin (5mm x 5mm) mlf ? package applications ? printer ? lom ? game console ? iptv ? ip phone ? ip set-top box ordering information part number temperature range package lead finish description ksz8041nl 0c to 70c 32-pin mlf? pb-free mii / rmii, commercial temperature ksz8041nli (1) ? 40c to 85c 32-pin mlf? pb-free mii / rmii, industrial temperature ksz8041nl am(1) ? 40c to 85c 32-pin mlf? pb-free mii / rmii, automotive qualified device KSZ8041MNLU ? 40c to 85c 32-pin mlf? pb-free ksz8041nl am with mii support only. ksz8041rnlu ? 40c to 85c 32-pin mlf? pb-free ksz8041nl am with rmii support only. ksz8041rnl 0c to 70c 32-pin mlf? pb-free rmii with 50mhz clock output, commercial temperature ksz8041rnli (1) ? 40c to 85c 32-pin mlf? pb-free rmii with 50mhz clock output, industrial temperature note: 1. contact factory for lead time.
micrel, inc. ksz8041nl/rnl september 2010 3 m9999-090910-1.4 revision history revision date summary of changes 1.0 10/13/06 data sheet created. 1.1 4/27/07 added maximum mdc clock speed. added 40k +/-30% to note 1 of pin description and strapping options tables for internal pull-ups/pull- downs. changed model number in register 3h ? phy identifier 2. changed polarity (swapped definition) of duplex strapping pin. removed duplex strapping pin update to register 4h ? auto-negotiation advertisement bits [8, 6]. set ?disable power saving? as the default for register 1fh bit [10]. corrected led1 (pin 31) definition for activity in led mode 01. added symbol error to mii/rmii receive erro r description and register 15h ? rxer counter. added a 100pf capacitor on rext (p in 10) in pin description table. 1.2 7/18/08 added automotive qualified part number to ordering information. added maximum case temperature. added thermal resistance ( jc ). added chip maximum current consumption. 1.3 12/11/09 added automotive qualified part number, ksz8041nl eam, to ordering information. changed mdio hold time (min) from 10ns to 4ns. added led drive current. renamed register 3h bits [3:0] to ?manufacturer?s revision number? and changed default value to ?indicates silicon revision.? updated rmii output delay for crs dv and rxd[1:0] output pins. added support for asymmetric pause in register 4h bit [11]. added control bits for 100base-tx preamble restore (register 14h bit [7]) and 10base-t preamble restore (register 14h bit [6]). changed strapping pin defini tion for config[2:0] = 100 from ?pcs loopback? to ?mii 100mbps preamble restore.? corrected mii timing for t rlat , t crs1 , t crs2 . added ksz8041rnl device and updated entire data sheet accordingly. 1.4 01/19/10 removed part number (ksz 8041nl eam) from ordering information. removed chip maximum current consumption.
micrel, inc. ksz8041nl/rnl september 2010 4 m9999-090910-1.4 contents general desc ription ............................................................................................................ .................................................. 1 functional diagram............................................................................................................. .................................................. 1 features ....................................................................................................................... .......................................................... 2 applicat ions................................................................................................................... ........................................................ 2 ordering info rmation ........................................................................................................... ................................................. 2 revision hi story............................................................................................................... ..................................................... 3 list of figures........................................................................................................................................................................ 7 list of tables ................................................................................................................. ........................................................ 8 pin configurati on ? ksz8041nl .................................................................................................. ........................................ 9 pin description ? ksz8041nl.................................................................................................... ........................................ 10 pin description ? ksz8 041nl (continued) ........................................................................................ ............................... 11 pin description ? ksz8 041nl (continued) ........................................................................................ ............................... 12 pin description ? ksz8 041nl (continued) ........................................................................................ ............................... 13 strapping options ? ksz8041nl.................................................................................................. ..................................... 14 pin configurati on ? ksz8041rnl ................................................................................................. .................................... 15 pin description ? ksz8041rnl ................................................................................................... ...................................... 16 pin description ? ksz8 041rnl (cont inued) ....................................................................................... ............................. 17 pin description ? ksz8 041rnl (cont inued) ....................................................................................... ............................. 18 strapping options ? ksz8041rnl ................................................................................................. ................................... 19 functional d escripti on ....................................................................................................................................................... 20 100base-tx transm it....................................................................................................................................................... 20 100base-tx receive............................................................................................................. ........................................... 20 pll clock synthesizer.......................................................................................................... ............................................ 20 scrambler/de-scrambler (100base-tx only)....................................................................................... ............................. 20 10base-t tr ansmit ........................................................................................................................................................... 20 10base-t re ceive ............................................................................................................................................................ 21 sqe and jabber function (10base-t only)........................................................................................ .............................. 21 auto-negot iation ............................................................................................................... ................................................ 21 mii management (miim ) interface ................................................................................................ .................................... 23 interrupt (intrp) .............................................................................................................. ................................................ 23 mii data interface (ksz8041nl only) ............................................................................................ .................................. 23 mii signal definition (ksz8041nl only) ......................................................................................... .................................. 24 transmit cl ock (txc) ........................................................................................................... ........................................ 24 transmit e nable (t xen) .............................................................................................................................................. 24 transmit data [3 :0] (txd[3:0]) ................................................................................................. .................................... 24 receive clock (rxc)............................................................................................................ ........................................ 24 receive data valid (r xdv).......................................................................................................................................... 25 receive data [3 :0] (rxd[3:0]) .................................................................................................. .................................... 25 receive error (rxer) ........................................................................................................... ....................................... 25 carrier sens e (crs) ............................................................................................................ ........................................ 25 collision (col) ............................................................................................................................................................. 25
micrel, inc. ksz8041nl/rnl september 2010 5 m9999-090910-1.4 reduced mii (rmii) data interface .............................................................................................. ..................................... 25 rmii signal de finition ......................................................................................................... .............................................. 26 reference cloc k (ref_clk) ...................................................................................................... ................................. 26 transmit enabl e (tx_en) ........................................................................................................ .................................... 26 transmit data [1 :0] (txd[1:0]) ................................................................................................. .................................... 26 carrier sense/receive data valid (crs_dv)...................................................................................... ........................ 27 receive data [1 :0] (rxd[1:0]) .................................................................................................. .................................... 27 receive error (rx_er) .......................................................................................................... ...................................... 27 collision de tection........................................................................................................................................................ 27 rmii signal diagram............................................................................................................ ............................................. 27 hp auto mdi/mdi -x.............................................................................................................. ............................................ 28 straight cable ................................................................................................................. .............................................. 29 crossover cable................................................................................................................ ........................................... 29 power m anagem ent............................................................................................................... ........................................... 30 power savi ng mode .............................................................................................................. ....................................... 30 power down mode ................................................................................................................ ....................................... 30 reference clock co nnection options ............................................................................................. ................................. 30 reference circuit for powe r and ground c onnections ............................................................................. ....................... 31 register map................................................................................................................... ..................................................... 32 register de scription ........................................................................................................... ................................................ 32 register descript ion (continued) ............................................................................................... ....................................... 33 register descript ion (continued) ............................................................................................... ....................................... 34 register descript ion (continued) ............................................................................................... ....................................... 35 register descript ion (continued) ............................................................................................... ....................................... 36 register descript ion (continued) ............................................................................................... ....................................... 37 register descript ion (continued) ............................................................................................... ....................................... 38 register descript ion (continued) ............................................................................................... ....................................... 39 absolute maximum ratings (1) ............................................................................................................................................ 40 operating ratings (2) ............................................................................................................................................................ 40 electrical characteristics (4) ................................................................................................................................................ 40 electrical characteristics (4) (continued)................................................................................................................... ......... 41 timing di agrams ................................................................................................................ ................................................. 42 mii sqe timing (10bas e-t) ............................................................................................................................................. 42 mii transmit timi ng (10base-t) ................................................................................................. ...................................... 43 mii receive timi ng (10base-t) .................................................................................................. ...................................... 44 mii transmit timi ng (100bas e-tx) .................................................................................................................................. 45 mii receive timi ng (100bas e-tx) ................................................................................................................................... 46 rmii timing.................................................................................................................... ................................................... 47 auto-negotiati on timi ng ........................................................................................................ ........................................... 48 mdc/mdio timing ................................................................................................................ ........................................... 49 reset timing................................................................................................................... .................................................. 50
micrel, inc. ksz8041nl/rnl september 2010 6 m9999-090910-1.4 reset ci rcui t .................................................................................................................. ...................................................... 51 reference circuits fo r led strapp ing pins...................................................................................... ................................ 52 selection of isolat ion transformer............................................................................................. ....................................... 213h 53 87h selection of refe rence crystal ................................................................................................. ......................................... 214h 53 88h package info rmation............................................................................................................ ............................................... 215h 54
micrel, inc. ksz8041nl/rnl september 2010 7 m9999-090910-1.4 list of figures figure 1. auto-negotiation flow chart......................................................................................... ........................................ 22 figure 2. ksz8041n l rmii interface............................................................................................ ....................................... 27 figure 3. ksz8041r nl rmii interface ........................................................................................... ..................................... 28 figure 4. typical stra ight cable connection ................................................................................... .................................... 29 figure 5. typical cros sover cable connection .................................................................................. ................................. 29 figure 6. 25mhz crystal / o scillator refe rence clock .......................................................................... .............................. 30 figure 7. 50mhz oscillator refere nce clock for ksz 8041nl rm ii mode ............................................................ .............. 30 figure 8. ksz8041nl/rnl power and ground connections.......................................................................... .................... 31 figure 9. mii sqe timing (10base-t) ........................................................................................... ...................................... 42 figure 10. mii transmi t timing (10base-t) ..................................................................................... .................................... 43 figure 11. mii receiv e timing (10base-t) ...................................................................................... .................................... 44 figure 12. mii transmi t timing (100base-tx)................................................................................... .................................. 45 figure 13. mii receiv e timing (100base-tx).................................................................................... .................................. 46 figure 14. rmii timing ? da ta received from rmii .............................................................................. .............................. 47 figure 15. rmii timing ? data input to rmii ................................................................................... .................................... 47 figure 16. auto-negotiation fa st link pulse (flp) ti ming ...................................................................... ........................... 48 figure 17. mdc/ mdio timing.................................................................................................... .......................................... 49 figure 18. re set timing....................................................................................................................................................... 50 figure 19. recommen ded reset circuit.......................................................................................... .................................... 51 figure 20. recommended reset circuit for in terfacing with cpu/fp ga reset output............................................... ....... 51 figure 21. reference circui ts for led st rapping pins.......................................................................... ............................... 52
micrel, inc. ksz8041nl/rnl september 2010 8 m9999-090910-1.4 list of tables table 1. mii mana gement frame format .......................................................................................... .................................. 23 table 2. mii si gnal definition ................................................................................................ ............................................... 24 table 3. rmii signal description ? ksz8041nl.................................................................................. ................................ 26 table 4. rmii signal description ? ksz8041rnl ................................................................................. .............................. 26 table 5. mdi/mdi- x pin definition ............................................................................................. .......................................... 28 table 6. ksz8041nl/rnl power pin de scription.................................................................................. ............................. 31 table 7. mii sqe timing (10base-t) parameters ................................................................................. .............................. 42 table 8. mii transmit ti ming (10base-t) parameters ............................................................................ ............................ 43 table 9. mii receive timi ng (10base-t) parameters ............................................................................. ............................ 44 table 10. mii transmit ti ming (100base-tx ) parameters ......................................................................... ......................... 45 table 11. mii receive timi ng (100base-tx) parameters .......................................................................... ......................... 46 table 12. rmii timing parameters ? ksz8041 nl .................................................................................. ............................ 47 table 13. rmii timing parameters ? ksz8041rnl................................................................................. ........................... 47 table 14. auto-negotiation fast li nk pulse (flp) ti ming para meters ............................................................ ................... 48 table 15. mdc/mdio timing pa rameters .......................................................................................... ................................. 49 table 16. reset timing parameters ............................................................................................. ....................................... 50 table 17. transformer selection criteria ...................................................................................... ....................................... 253h 53 127h table 18. qualified si ngle port m agnetics..................................................................................... ...................................... 254h 53 128h table 19. typical referenc e crystal characteristics ........................................................................... ................................ 255h 53
micrel, inc. ksz8041nl/rnl september 2010 9 m9999-090910-1.4 pin configuration ? ksz8041nl 32-pin (5mm x 5mm) mlf ?
micrel, inc. ksz8041nl/rnl september 2010 10 m9999-090910-1.4 pin description ? ksz8041nl pin number pin name type (1) pin function 1 gnd gnd ground 2 vddpll_1.8 p 1.8v analog v dd 3 vdda_3.3 p 3.3v analog v dd 4 rx- i/o physical receive or transmit signal (- differential) 5 rx+ i/o physical receive or transmit signal (+ differential) 6 tx- i/o physical transmit or receive signal (- differential) 7 tx+ i/o physical transmit or receive signal (+ differential) 8 xo o crystal feedback this pin is used only in mii mode when a 25 mhz crystal is used. this pin is a no connect if oscillator or external clock source is used, or if rmii mode is selected. 9 xi / refclk i crystal / oscillator / external clock input mii mode: 25mhz +/-50ppm (crystal, oscillator, or external clock) rmii mode: 50mhz +/-50ppm (oscillator, or external clock only) 10 rext i/o set physical transmit output current connect a 6.49k resistor in parallel with a 100pf capacitor to ground on this pin. see ksz8041nl reference schematics. 11 mdio i/o management interface (mii) data i/o this pin requires an external 4.7k pull-up resistor. 12 mdc i management interface (mii) clock input this pin is synchronous to the mdio data interface. 13 rxd3 / phyad0 ipu/o mii mode: receive data output[3] (2) / config mode: the pull-up/pull-down va lue is latched as phyaddr[0] during power-up / reset. see ?strapping options? section for details. 14 rxd2 / phyad1 ipd/o mii mode: receive data output[2] (2) / config mode: the pull-up/pull-down va lue is latched as phyaddr[1] during power-up / reset. see ?strapping options? section for details. 15 rxd1 / rxd[1] / phyad2 ipd/o mii mode: receive data output[1] (2) / rmii mode: receive data output[1] (3) / config mode: the pull-up/pull-down va lue is latched as phyaddr[2] during power-up / reset. see ?strapping options? section for details. 16 rxd0 / rxd[0] / duplex ipu/o mii mode: receive data output[0] (2) / rmii mode: receive data output[0] (3) / config mode: latched as duplex (regi ster 0h, bit 8) during power-up / reset. see ?strapping options? section for details. 17 vddio_3.3 p 3.3v digital v dd 18 rxdv / crsdv / config2 ipd/o mii mode: receive data valid output / rmii mode: carrier sense/receive data valid output / config mode: the pull-up/pull-down value is latched as config2 during power-up / reset. see ?strapping options? section for details. 19 rxc o mii mode: receive clock output
micrel, inc. ksz8041nl/rnl september 2010 11 m9999-090910-1.4 pin description ? ksz8041nl (continued) pin number pin name type (1) pin function 20 rxer / rx_er / iso ipd/o mii mode: receive error output / rmii mode: receive error output / config mode: the pull-up/pull-down value is latched as isolate during power-up / reset. see ?strapping options? section for details. 21 intrp opu interrupt output: programmable interrupt output register 1bh is the interrupt control/status register for programming the interrupt conditions and reading the interrupt status. register 1fh bit 9 sets the interrupt output to active low (default) or active high. 22 txc o mii mode: transmit clock output 23 txen / tx_en i mii mode: transmit enable input / rmii mode: transmit enable input 24 txd0 / txd[0] i mii mode: transmit data input[0] (4) / rmii mode: transmit data input[0] (5) 25 txd1 / txd[1] i mii mode: transmit data input[1] (4) / rmii mode: transmit data input[1] (5) 26 txd2 i mii mode: transmit data input[2] (4) / 27 txd3 i mii mode: transmit data input[3] (4) / 28 col / config0 ipd/o mii mode: collision detect output / config mode: the pull-up/pull-down value is latched as config0 during power-up / reset. see ?strapping options? section for details. 29 crs / config1 ipd/o mii mode: carrier sense output / config mode: the pull-up/pull-down value is latched as config1 during power-up / reset. see ?strapping options? section for details.
micrel, inc. ksz8041nl/rnl september 2010 12 m9999-090910-1.4 pin description ? ksz8041nl (continued) pin number pin name type (1) pin function 30 led0 / nwayen ipu/o led output: programmable led0 output / config mode: latched as auto-negotiati on enable (register 0h, bit 12) during power-up / reset. see ?strapping options? section for details. the led0 pin is programmable via regist er 1eh bits [15:14], and is defined as follows. led mode = [00] link/activity pin state led definition no link h off link l on activity toggle blinking led mode = [01] link pin state led definition no link h off link l on led mode = [10] reserved led mode = [11] reserved
micrel, inc. ksz8041nl/rnl september 2010 13 m9999-090910-1.4 pin description ? ksz8041nl (continued) pin number pin name type (1) pin function 31 led1 / speed ipu/o led output: programmable led1 output / config mode: latched as speed (register 0h, bit 13) during power-up / reset. see ?strapping options? section for details. the led1 pin is programmable via regist er 1eh bits [15:14], and is defined as follows. led mode = [00] speed pin state led definition 10bt h off 100bt l on led mode = [01] activity pin state led definition no activity h off activity toggle blinking led mode = [10] reserved led mode = [11] reserved 32 rst# i chip reset (active low) paddle gnd gnd ground notes: 1. p = power supply. gnd = ground. i = input. o = output. i/o = bi-directional. ipd = input with internal pull-down (40k +/-30%). ipu = input with internal pull-up (40k +/-30%). opu = output with internal pull-up (40k +/-30%). ipu/o = input with internal pull-up (40k +/-30%) during power-up/reset; output pin otherwise. ipd/o = input with internal pull-down (40k +/-30%) during power-up/reset; output pin otherwise. 2. mii rx mode: the rxd[3..0] bits are synchronous with rxclk. when rxdv is asserted, rxd[3..0] presents valid data to mac th rough the mii. rxd[3..0] is invalid when rxdv is de-asserted. 3. rmii rx mode: the rxd[1:0] bits are synchronous with ref_cl k. for each clock period in which crs_dv is asserted, two bits of recovered data are sent from the phy. 4. mii tx mode: the txd[3..0] bits are synchronous with txclk. when txen is asserted, txd[3..0] presents valid data from the mac through the mii. txd[3..0] has no effect when txen is de-asserted. 5. rmii tx mode: the txd[1:0] bits are synchronous with ref_cl k. for each clock period in which tx_en is asserted, two bits o f data are received by the phy from the mac.
micrel, inc. ksz8041nl/rnl september 2010 14 m9999-090910-1.4 strapping options ? ksz8041nl pin number pin name type (1) pin function 15 14 13 phyad2 phyad1 phyad0 ipd/o ipd/o ipu/o the phy address is latched at power-up / reset and is configurable to any value from 1 to 7. the default phy address is 00001. phy address bits [4:3] ar e always set to ?00?. 18 29 28 config2 config1 config0 ipd/o ipd/o ipd/o the config[2:0] strap-in pins are latched at power-up / reset and are defined as follows: config[2:0] mode 000 mii (default) 001 rmii 010 reserved ? not used 011 reserved ? not used 100 mii 100mbps preamble restore 101 reserved ? not used 110 reserved ? not used 111 reserved ? not used 20 iso ipd/o isolate mode pull-up = enable pull-down (default) = disable during power-up / reset, this pin value is latched into register 0h bit 10. 31 speed ipu/o speed mode pull-up (default) = 100mbps pull-down = 10mbps during power-up / reset, this pin value is latched into register 0h bit 13 as the speed select, and also is latched into register 4h (auto-negotiation advertisement) as the speed capability support. 16 duplex ipu/o duplex mode pull-up (default) = half duplex pull-down = full duplex during power-up / reset, this pin value is latched into register 0h bit 8 as the duplex mode. 30 nwayen ipu/o nway au to-negotiation enable pull-up (default) = enable auto-negotiation pull-down = disable auto-negotiation during power-up / reset, this pin value is latched into register 0h bit 12. note: 1. ipu/o = input with internal pull-up (40k +/-30%) during power-up/reset; output pin otherwise. ipd/o = input with internal pull-down (40k +/-30%) during power-up/reset; output pin otherwise. pin strap-ins are latched during power-up or reset. in some systems, the mac receive input pins may drive high during power-up or reset, and co nsequently cause the ph y strap-in pins on the mii/rmii si gnals to be latched high. in this case, it is recommended to add 1k pull-downs on these phy strap-in pins to ensure the phy does not strap-in to isolate mode, or is not configured with an incorrect phy address.
micrel, inc. ksz8041nl/rnl september 2010 15 m9999-090910-1.4 pin configuration ? ksz8041rnl 32-pin (5mm x 5mm) mlf ?
micrel, inc. ksz8041nl/rnl september 2010 16 m9999-090910-1.4 pin description ? ksz8041rnl pin number pin name type (1) pin function 1 gnd gnd ground 2 vddpll_1.8 p 1.8v analog v dd 3 vdda_3.3 p 3.3v analog v dd 4 rx- i/o physical receive or transmit signal (- differential) 5 rx+ i/o physical receive or transmit signal (+ differential) 6 tx- i/o physical transmit or receive signal (- differential) 7 tx+ i/o physical transmit or receive signal (+ differential) 8 xo o crystal feedback ? for 25 mhz crystal this pin is a no connect if oscillator or external clock source is used. 9 xi i crystal / oscillator / external clock input 25mhz +/-50ppm 10 rext i/o set physical transmit output current connect a 6.49k resistor in parallel with a 100pf capacitor to ground on this pin. see ksz8041rnl reference schematics. 11 mdio i/o management interface (mii) data i/o this pin requires an external 4.7k pull-up resistor. 12 mdc i management interface (mii) clock input this pin is synchronous to the mdio data interface. 13 phyad0 ipu/o the pull-up/pull-down value is latched as phyaddr[0] during power-up / reset. see ?strapping options? section for details. 14 phyad1 ipd/o the pull-up/pull-down value is latched as phyaddr[1] during power-up / reset. see ?strapping options? section for details. 15 rxd1 / phyad2 ipd/o rmii mode: rmii receive data output[1] (2) / config mode: the pull-up/pull-down va lue is latched as phyaddr[2] during power-up / reset. see ?strapping options? section for details. 16 rxd0 / duplex ipu/o rmii mode: rmii receive data output[0] (2) / config mode: latched as duplex (r egister 0h, bit 8) during power-up / reset. see ?strapping options? section for details. 17 vddio_3.3 p 3.3v digital v dd 18 crs_dv / config2 ipd/o rmii mode: carrier sense/ receive data valid output / config mode: the pull-up/pull-down value is latched as config2 during power-up / reset. see ?strapping options? section for details. 19 ref_clk o 50mhz clock output this pin provides the 50mhz rmii re ference clock output to the mac. 20 rx_er / iso ipd/o rmii mode: rmii receive error output / config mode: the pull-up/pull-down value is latched as isolate during power-up / reset. see ?strapping options? section for details. 21 intrp opu interrupt output: programmable interrupt output register 1bh is the interrupt contro l/status register for programming the interrupt conditions and reading the interrupt status. register 1fh bit 9 sets the interrupt output to active low (default) or active high. 22 nc o no connect 23 tx_en i rmii transmit enable input
micrel, inc. ksz8041nl/rnl september 2010 17 m9999-090910-1.4 pin description ? ksz8041rnl (continued) pin number pin name type (1) pin function 24 txd0 i rmii transmit data input[0] (3) 25 txd1 i rmii transmit data input[1] (3) 26 nc i no connect 27 nc i no connect 28 config0 ipd/o the pull-up/pull-down value is latched as config0 during power-up / reset. see ?strapping options? section for details. 29 config1 ipd/o the pull-up/pull-down value is latched as config1 during power-up / reset. see ?strapping options? section for details. 30 led0 / nwayen ipu/o led output: programmable led0 output / config mode: latched as auto-negotiation enable (register 0h, bit 12) during power-up / reset. see ?strapping options? section for details. the led0 pin is programmable via regist er 1eh bits [15:14], and is defined as follows. led mode = [00] link/activity pin state led definition no link h off link l on activity toggle blinking led mode = [01] link pin state led definition no link h off link l on led mode = [10] , [11] reserved
micrel, inc. ksz8041nl/rnl september 2010 18 m9999-090910-1.4 pin description ? ksz8041rnl (continued) pin number pin name type (1) pin function 31 led1 / speed ipu/o led output: programmable led1 output / config mode: latched as speed (register 0h, bit 13) during power-up / reset. see ?strapping options? section for details. the led1 pin is programmable via regist er 1eh bits [15:14], and is defined as follows. led mode = [00] speed pin state led definition 10bt h off 100bt l on led mode = [01] activity pin state led definition no activity h off activity toggle blinking led mode = [10], [11] reserved 32 rst# i chip reset (active low) paddle gnd gnd ground notes: 1. p = power supply. gnd = ground. i = input. o = output. i/o = bi-directional. opu = output with internal pull-up (40k +/-30%). ipu/o = input with internal pull-up (40k +/-30%) during power-up/reset; output pin otherwise. ipd/o = input with internal pull-down (40k +/-30%) during power-up/reset; output pin otherwise. 2. rmii rx mode: the rxd[1:0] bits are synchronous with ref_cl k. for each clock period in which crs_dv is asserted, two bits of recovered data are sent from the phy. 3. rmii tx mode: the txd[1:0] bits are synchronous with ref_cl k. for each clock period in which tx_en is asserted, two bits o f data are received by the phy from the mac.
micrel, inc. ksz8041nl/rnl september 2010 19 m9999-090910-1.4 strapping options ? ksz8041rnl pin number pin name type (1) pin function 15 14 13 phyad2 phyad1 phyad0 ipd/o ipd/o ipu/o the phy address is latched at power-up / reset and is configurable to any value from 1 to 7. the default phy address is 00001. phy address bits [4:3] ar e always set to ?00?. 18 29 28 config2 config1 config0 ipd/o ipd/o ipd/o the config[2:0] strap-in pins are latched at power-up / reset and are defined as follows: config[2:0] mode 000 reserved ? not used 001 rmii 010 reserved ? not used 011 reserved ? not used 100 reserved ? not used 101 reserved ? not used 110 reserved ? not used 111 reserved ? not used 20 iso ipd/o isolate mode pull-up = enable pull-down (default) = disable during power-up / reset, this pin value is latched into register 0h bit 10. 31 speed ipu/o speed mode pull-up (default) = 100mbps pull-down = 10mbps during power-up / reset, this pin value is latched into register 0h bit 13 as the speed select, and also is latched into register 4h (auto-negotiation advertisement) as the speed capability support. 16 duplex ipu/o duplex mode pull-up (default) = half duplex pull-down = full duplex during power-up / reset, this pin value is latched into register 0h bit 8 as the duplex mode. 30 nwayen ipu/o nway au to-negotiation enable pull-up (default) = enable auto-negotiation pull-down = disable auto-negotiation during power-up / reset, this pin value is latched into register 0h bit 12. note: 1. ipu/o = input with internal pull-up (40k +/-30%) during power-up/reset; output pin otherwise. ipd/o = input with internal pull-down (40k +/-30%) during power-up/reset; output pin otherwise. pin strap-ins are latched during power-up or reset. in some systems, the mac receive input pins may drive high during power-up or reset, and consequently cause the phy strap-in pins on the rmii signals to be latched high. in this case, it is recommended to add 1k pull-downs on these phy strap-in pins to ensure the phy does not strap-in to isolate mode, or is not configured with an incorrect phy address.
micrel, inc. ksz8041nl/rnl september 2010 20 m9999-090910-1.4 functional description the ksz8041nl is a single 3.3v supply fast ethernet transceiver . it is fully compliant with the ieee 802.3u specification. on the media side, the ksz8041nl supports 10base-t and 100b ase-tx with hp auto mdi/mdi-x for reliable detection of and correction for straight-through and crossover cables. the ksz8041nl offers a choice of mii or rmii data interf ace connection with the mac processor. the mii management bus option gives the mac processor complete access to th e ksz8041nl control and status registers. additionally, an interrupt pin eliminates the need for the processor to poll for phy status change. physical signal transmission and reception are enhanced th rough the use of patented analog circuitries that make the design more efficient and allow for lower power consumption and smaller chip die size. the ksz8041rnl is an enhanced rmii version of the ksz8041nl that does not require a 50mhz system clock. it uses a 25mhz crystal for its input reference clock and ou tputs a 50mhz rmii reference clock to the mac. 100base-tx transmit the 100base-tx transmit function performs parallel-to-s erial conversion, 4b/5b codi ng, scrambling, nrz-to-nrzi conversion, and mlt3 encoding and transmission. the circuitry 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/5 b coding, 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 6.49k 1% resistor for the 1:1 transformer ratio. it has typical rise/fall times of 4 ns and complies with the ansi tp-pmd standard regarding amplitude balance, ov ershoot and timing jitter. the wave- shaped 10base-t output drivers are also incorporated into the 100base-tx drivers. 100base-tx receive the 100base-tx receiver function performs adaptive equalization, dc restoration, mlt3-to-nr zi 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 equalizati on 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 cable length, the equalizer must adjust its characteristics to optimize performance. in this design, the variable equalizer makes an initial estimation based on comparisons of incoming signal strength against some known cabl e characteristics, and then tunes itself for optimization. this is an ongoing process and self-adjusts against environmental changes such as temperature variations. next, the equalized signal goes through a dc restoration and dat a conversion block. the dc restoration circuit is used to compensate for the effect of baseline wander and to 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 1 25mhz clock from the edges of the nrzi signal. this recovered clock is then used to convert the nrzi signal into the nrz format. this si gnal is sent through the de-sc rambler 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. pll clock synthesizer the ksz8041nl/rnl generates 125m z, 25m z and 20m z clocks for system timing. internal clocks are generated from an external 25mhz crystal or oscillator. for the ksz8041nl in rmii mode, these internal clocks are generated from an external 50mhz oscilla tor or system clock. scrambler/de-scrambler (100base-tx only) the purpose of the scrambler is to spr ead the power spectrum of the signal in order to reduce emi and baseline wander. 10base-t transmit the 10base-t drivers are incorporated wi th the 100base-tx drivers to allow for transmission using the same magnetic. the drivers also perform internal wave-shaping and pre-emphasize, and output 10base-t signals with a typical amplitude of 2.5v peak. the 10base-t signals ha ve harmonic contents that are at leas t 27db below the fundamental frequency when driven by an all-ones manchester-encoded signal.
micrel, inc. ksz8041nl/rnl september 2010 21 m9999-090910-1.4 10base-t receive on the receive side, input buffer and level detecting squelch ci rcuits are employed. a differential input receiver circuit and a pll performs 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 to prevent noise at the rx+ and rx- inputs from falsely trigger the decoder. when the input exceeds the squelch limit, the pll locks onto the incoming signal and the ksz8041nl/rnl decodes a data frame. the receive clock is kept active during idle periods in between data reception. sqe and jabber function (10base-t only) in 10base-t operation, a short pulse is put out on the col pin after each frame is transmitted. this sqe test is required as a test of the 10base-t transmit/recei ve path. if transmit enable (txen) is high for more than 20 ms (jabbering), the 10base-t transmitter is disabled and col is asserted high. if txen is then driven low for more than 250 ms, the 10base- t transmitter is re-enabled and col is de-asserted (returns to low). auto-negotiation the ksz8041nl/rnl conforms to the aut o-negotiation protocol, defined in claus e 28 of the ieee 802. 3u specification. auto-negotiation is enabled by either hardware pin st rapping (pin 30) or software (register 0h bit 12). auto-negotiation allows unshielded twisted pair (utp) link partn ers to select the highest common mode of operation. link partners advertise their capabilities to each other, and then co mpare their own capabilities with those they received from their link partners. the highest speed and du plex setting that is common to the two link partners is selected as the mode of operation. the following list shows the speed and duplex operation mode from highest to lowest. ? priority 1: 100base-tx, full-duplex ? priority 2: 100base-tx, half-duplex ? priority 3: 10base-t, full-duplex ? priority 4: 10base-t, half-duplex if auto-negotiation is not supported or the ksz8041nl/rnl li nk partner is forced to bypass auto-negotiation, the ksz8041nl/rnl sets its operating mode by observing the signal at its receiver. this is known as parallel detection, and allows the ksz8041nl/rnl to establish link by listening for a fixed signal protocol in the absence of auto-negotiation advertisement protocol. the auto-negotiation link up process is shown in the flow chart illustrated as figure 1.
micrel, inc. ksz8041nl/rnl september 2010 22 m9999-090910-1.4 start auto negotiation force link setting listen for 10base-t link pulses listen for 100base-tx idles a ttempt auto negotiation link mode set bypass auto negotiation and set link mode link mode set ? parallel operation join flow n o yes yes no figure 1. auto-negotiation flow chart
micrel, inc. ksz8041nl/rnl september 2010 23 m9999-090910-1.4 mii management (miim) interface the ksz8041nl/rnl supports the ieee 802. 3 mii management interface, also kn own as the management data input / output (mdio) interface. this interface allows upper-l ayer devices to monitor and control the state of the ksz8041nl/rnl. an external device with miim capability is used to read the phy status and/or configure the phy settings. further details on the miim interface can be found in clause 22.2.4 of the ieee 802.3 specification. the miim interface consists of the following: ? a physical connection that incorporates t he clock line (mdc) and the data line (mdio). ? a specific protocol that operates across the aforementioned physical connection that allows a external controller to communicate with one or more phy devices. each ksz8041nl/rnl device is as signed a unique phy address between 1 and 7 by its phyad[2:0] strapping pins. also , every ksz8041nl/rnl device supports the broadcast phy address 0, as defined per the i eee 802.3 specification, which can be used to read/write to a single ksz8041nl/rnl device, or write to multiple ksz8041nl/rnl devices simultaneously. ? a set of 16-bit mdio registers. register [0:6] are required, and their functions are defined per the ieee 802.3 specification. the additional registers are provided for expanded functionality. the table 1 shows the mii management frame format for the ksz8041nl/rnl. preamble start of frame read/write op code phy address bits [4:0] reg address bits [4:0] ta data bits [15:0] idle read 32 1?s 01 10 00aaa rrrrr z0 dddddddd_dddddddd z write 32 1?s 01 01 00aaa rrrrr 10 dddddddd_dddddddd z table 1. mii management frame format interrupt (intrp) intrp (pin 21) is an optional interrupt signal that is used to inform the external controller that there has been a status update to the ksz8041nl/rnl phy register. bi ts[15:8] of register 1bh are the in terrupt control bits, and are used to enable and disable the conditions for asserting the intrp signal. bi ts[7:0] of register 1bh are the interrupt status bits, and are used to indicate which interrupt conditions have occurred . the interrupt status bits ar e cleared after reading register 1bh. bit 9 of register 1fh sets the interrupt level to active high or active low. mii data interface (ksz8041nl only) the media independent interface (mii) is sp ecified in clause 22 of the ieee 802.3 specification. it provides a common interface between physical layer and mac layer devic es, and has the following key characteristics: ? supports 10mbps and 100mbps data rates. ? uses a 25mhz reference cl ock, sourced by the phy. ? provides independent 4-bit wide (nibble) transmit and receive data paths. ? contains two distinct groups of signals: one for transmission and the other for reception. by default, the ksz8041nl is configured to mii mode a fter it is power-up or reset with the following: ? a 25mhz crystal connected to xi, xo (pins 9, 8), or an external 25mhz cl ock source (oscillator) connected to xi. ? config[2:0] (pins 18, 29, 28) set to ?000? (default setting).
micrel, inc. ksz8041nl/rnl september 2010 24 m9999-090910-1.4 mii signal definition (ksz8041nl only) the table 2 describes the mii signals. refer to clause 22 of the ieee 802.3 specificati on for detailed information. mii signal name direction (with respect to phy, ksz8041nl signal) direction (with respect to mac) description txc output input transmit clock (2.5mhz for 10mbps; 25mhz for 100mbps) txen input output transmit enable txd[3:0] input output transmit data [3:0] rxc output input receive clock (2.5mhz for 10mbps; 25mhz for 100mbps) rxdv output input receive data valid rxd[3:0] output input receive data [3:0] rxer output input, or (not required) receive error crs output input carrier sense col output input collision detection table 2. mii signal definition transmit clock (txc) txc is sourced by the phy. it is a continuous clock t hat provides the timing reference for txen and txd[3:0]. txc is 2.5mhz for 10mbps operation and 25mhz for 100mbps operation. transmit enable (txen) txen indicates the mac is presenting nibbles on txd[3:0] for transmission. it is asserted synchronously with the first nibble of the preamble and re mains asserted while all nibbles to be transmitted are presented on the mii, and is negated prior to the first txc following the final nibble of a frame. txen transitions synchronous ly with respect to txc. transmit data [3:0] (txd[3:0]) txd[3:0] transitions synchronously with respect to txc. when txen is asserted, txd[3:0] are accepted for transmission by the phy. txd[3:0] is ?00? to indica te idle when txen is de-asserted. values other than ?00? on txd[3:0] while txen is de-asserted are ignored by the phy. receive clock (rxc) rxc provides the timing reference for rxdv, rxd[3:0], and rxer. ? in 10mbps mode, rxc is recovered from the line while carr ier is active. rxc is derived from the phy?s reference clock when the line is idle, or link is down. ? in 100mbps mode, rxc is continuously recovered from t he line. if link is down, rxc is derived from the phy?s reference clock. rxc is 2.5mhz for 10mbps operation and 25mhz for 100mbps operation.
micrel, inc. ksz8041nl/rnl september 2010 25 m9999-090910-1.4 receive data valid (rxdv) rxdv is driven by the phy to indicate that the phy is presenting recovered and decoded nibbles on rxd[3:0]. ? in 10mbps mode, rxdv is asserted with the first nibble of the sfd (start of frame delimiter), ?5d?, and remains asserted until the end of the frame. ? in 100mbps mode, rxdv is asserted from the first nibbl e of the preamble to the last nibble of the frame. rxdv transitions synchronously with respect to rxc. receive data [3:0] (rxd[3:0]) rxd[3:0] transitions synchronously with respect to rxc. for each clock period in which rxdv is asserted, rxd[3:0] transfers a nibble of recovered data from the phy. receive error (rxer) rxer is asserted for one or more rxc periods to indicate that a symbol error (e.g. a coding error that a phy is capable of detecting, and that may otherwise be undetectable by t he mac sub-layer) was detected somewhere in the frame presently being transferred from the phy. rxer transitions synchronously with re spect to rxc. while rxdv is de-assert ed, rxer has no effect on the mac. carrier sense (crs) crs is asserted and de-asserted as follows: ? in 10mbps mode, crs assertion is based on the recept ion of valid preambles. crs de-assertion is based on the reception of an end-of-frame (eof) marker. ? in 100mbps mode, crs is asserted when a start-of-stream delimiter, or /j/k symbol pair is detected. crs is de- asserted when an end-of-stream delimiter, or /t/r symbol pair is detected. additionally, the pma layer de-asserts crs if idle symbols are received without /t/r. collision (col) col is asserted in half-duplex mode whenever the transmitter an d receiver are simultaneously active on the line. this is used to inform the mac that a collision has occurred during its transmission to the phy. col transitions asynchronously with respect to txc and rxc. reduced mii (rmii) data interface the reduced media independent interface (rmii) specifies a low pin count media independent interface (mii). it provides a common interface between physical layer and mac layer devices, and has the following key characteristics: ? supports 10mbps and 100mbps data rates. ? uses a 50mhz reference clock. ? provides independent 2-bit wide (di-bit) transmit and receive data paths. ? contains two distinct groups of signals: one for transmission and the other for reception. the ksz8041nl is configured in rmii mode after it is power-up or reset with the following: ? a 50mhz reference clock connected to refclk (pin 9). ? config[2:0] (pins 18, 29, 28) set to ?001?. the ksz8041rnl is configured in rmii mode and outputs the 50mhz rmii reference clock to the mac on ref_clk (pin 19) after it is power-up or reset with the following: ? a 25mhz crystal connected to xi (pin 9) and xo (pin 8) , or a 25mhz reference clock connected to xi (pin 9). ? config[2:0] (pins 18, 29, 28) set to ?001?. in rmii mode, unused mii signals, txd[3:2] (pins 27, 26), are tied to ground.
micrel, inc. ksz8041nl/rnl september 2010 26 m9999-090910-1.4 rmii signal definition the tables 3 and 4 describe the rmii signals for ksz8041nl an d ksz8041rnl. refer to rmii specification for detailed information. rmii signal name direction (with respect to phy, ksz8041nl signal) direction (with respect to mac) description ref_clk input input, or output synchronous 50 mhz clock reference for receive, transmit and control interface tx_en input output transmit enable txd[1:0] input output transmit data [1:0] crs_dv output input carrier sense/receive data valid rxd[1:0] output input receive data [1:0] rx_er output input, or (not required) receive error table 3. rmii signal description ? ksz8041nl rmii signal name direction (with respect to phy, ksz8041rnl signal) direction (with respect to mac) description ref_clk output input synchronous 50 mhz clock reference for receive, transmit and control interface tx_en input output transmit enable txd[1:0] input output transmit data [1:0] crs_dv output input carrier sense/receive data valid rxd[1:0] output input receive data [1:0] rx_er output input, or (not required) receive error table 4. rmii signal description ? ksz8041rnl reference clock (ref_clk) ref_clk is a continuous 50mhz clock that provides the ti ming reference for tx_en, txd[ 1:0], crs_dv, rxd[1:0], and rx_er. the ksz8041nl inputs the 50mhz ref_clk from the mac or system board. the ksz8041rnl generates the 50mhz rmii ref_clk and outputs it to the mac. transmit enable (tx_en) tx_en indicates that the mac is presenting di-bits on txd[1:0] for transmission. it is asserted synchronously with the first nibble of the preamble and remains asserted while all di-bit s to be transmitted are pres ented on the rmii, and is negated prior to the first ref_clk following the final di-bit of a frame. tx_en transitions synchronously with respect to ref_clk. transmit data [1:0] (txd[1:0]) txd[1:0] transitions synchronously with respect to ref_clk. when tx_en is asserted, txd[1:0] are accepted for transmission by the phy. txd[1:0] is ?00? to indicate idle when tx_en is de- asserted. values other t han ?00? on txd[1:0] while tx_en is de-asserted are ignored by the phy.
micrel, inc. ksz8041nl/rnl september 2010 27 m9999-090910-1.4 carrier sense/receive data valid (crs_dv) crs_dv is asserted by the phy when t he receive medium is non-idle. it is asserted asynchronously on detection of carrier. this is when squelch is passed in 10mbps mode, and when 2 non-contiguous zeroes in 10 bits are detected in 100mbps mode. loss of carrier result s in the de-assertion of crs_dv. so long as carrier detection criteria are met, crs_dv remains as serted continuously from the first recovered di-bit of the frame through the final recovered di-bit, and it is negated prior to the first ref_clk that follows the final di-bit. the data on rxd[1:0] is considered valid once crs_dv is asserted. however, since the assertion of crs_dv is asynchronous relative to ref_clk, the data on rxd[1:0] is " 00" until proper receive signal decoding takes place. receive data [1:0] (rxd[1:0]) rxd[1:0] transitions synchronously to ref_ clk. for each clock period in which cr s_dv is asserted, rxd[1:0] transfers two bits of recovered data from the phy. rxd[1:0] is "00" to indicate idle when crs_dv is de-asserted. values other than ?00? on rxd[1:0] while crs_dv is de-asserted are ignored by the mac. receive error (rx_er) rx_er is asserted for one or more ref_clk periods to indica te that a symbol error (e.g. a coding error that a phy is capable of detecting, and that may otherwise be undetect able by the mac sub-layer) wa s detected somewhere in the frame presently being transferred from the phy. rx_er transitions synchronously with respect to ref_clk. while crs_dv is de-asserted, rx_er has no effect on the mac. collision detection the mac regenerates the col signal of the mii from tx_en and crs_dv. rmii signal diagram the ksz8041nl rmii pin connections to the mac are shown in figure 2. figure 2. ksz8041nl rmii interface
micrel, inc. ksz8041nl/rnl september 2010 28 m9999-090910-1.4 the ksz8041rnl rmii pin connections to the mac are shown in figure 3. figure 3. ksz8041rnl rmii interface hp auto mdi/mdi-x hp auto mdi/mdi-x configuration elimi nates the confusion of whether to use a straight cable or a crossover cable between the ksz8041nl/rnl and its link partner. this feature allows the ksz8041nl/rnl to use either type of cable to connect with a link partner that is in either mdi or mdi- x mode. the auto-sense function detects transmit and receive pairs from the link partner, and then assigns transmit and receive pairs of the ksz8041nl/rnl accordingly. hp auto mdi/mdi-x is enabled by default. it is disabled by writing a one to register 1f bit 13. mdi and mdi-x mode is selected by register 1f bit 14 if hp auto mdi/mdi-x is disabled. an isolation transformer with symmetrical transmit and re ceive data paths is recommended to support auto mdi/mdi-x. the ieee 802.3 standard defines mdi and mdi-x as follows: mdi mdi-x rj-45 pin signal rj-45 pin signal 1 td+ 1 rd+ 2 td- 2 rd- 3 rd+ 3 td+ 6 rd- 6 td- table 5. mdi/mdi-x pin definition
micrel, inc. ksz8041nl/rnl september 2010 29 m9999-090910-1.4 straight cable a straight cable connects a mdi device to a mdi-x device, or a mdi-x device to a mdi device. the figure 4 depicts a typical straight cable connection between a nic card (mdi) and a switch, or hub (mdi-x). receive pair transmit pair receive pair 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 transmit pair modular connector (rj-45) nic straight cable 10/100 ethernet media dependent interface 10/100 ethernet media dependent interface modular connector (rj-45) hub (repeater or switch) figure 4. typical straight cable connection crossover cable a crossover cable connects a mdi device to another mdi devic e, or a mdi-x device to another mdi-x device. figure 5 depicts a typical crossover cable connection between two switches or hubs (two mdi-x devices). receive pair receive pair transmit pair 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 transmit pair 10/100 ethernet media dependent interface 10/100 ethernet media dependent interface modular connector (rj-45) hub (repeater or switch) modular connector (rj-45) hub (repeater or switch) crossover cable figure 5. typical crossover cable connection
micrel, inc. ksz8041nl/rnl september 2010 30 m9999-090910-1.4 power management the ksz8041nl/rnl offers the following power management modes: power saving mode this mode is used to reduce power consumption when the cable is unplugged. it is in effect when auto-negotiation mode is enabled, cable is disconnected, and register 1f bit 10 is set to 1. under power saving mode, the ksz8041nl/rnl shuts down all transceiver blocks, except for transmitter, energy detect and pll circuits. additionally, for the ksz8041nl in mii mode, the rxc clock output is dis abled. rxc clock is enabled after the cabl e is connected and link is established. power saving mode is disabled by writing a zero to register 1f bit 10. power down mode this mode is used to power down the entire ksz8041nl/rnl device when it is not in use. power down mode is enabled by writing a one to register 0 bit 11. in the power down state, the ksz8041nl/rnl di sables all internal functions, except for the mii management interface. reference clock connection options a crystal or clock source, such as an oscillator, is used to provide the reference clock for the ksz8041nl/rnl. the figure 6 illustrates how to connect the 25mhz crystal and oscillator reference clock. figure 6. 25mhz crystal / oscillator reference clock for the ksz8041nl, figure 7 illustrates how to connect the 50mhz oscillator reference clock for rmii mode. figure 7. 50mhz oscillator refere nce clock for ksz8041nl rmii mode
micrel, inc. ksz8041nl/rnl september 2010 31 m9999-090910-1.4 reference circuit for power and ground connections the ksz8041nl/rnl is a single 3.3v s upply device with a built-in 1.8v low noise regulator. the power and ground connections are shown in figure 8 and table 6. 17 vddio_3.3 ksz8041nl/rnl vddpll_1.8 0.1uf 10uf v in gnd v out ` 1.8v low noise regulator (integrated) 1 3.3v 3 vdda_3.3 ferrite bead paddle 2 0.1uf 22uf ` 0.1uf 22uf ` figure 8. ksz8041nl/rnl power and ground connections power pin pin number description vddpll_1.8 2 decouple with 10uf and 0.1uf capacitors to ground. vdda_3.3 3 connect to board?s 3.3v supply through ferrite bead. vddio_3.3 17 connect to board?s 3.3v supply. table 6. ksz8041nl/rnl power pin description
micrel, inc. ksz8041nl/rnl september 2010 32 m9999-090910-1.4 register map register number (hex) description 0h basic control 1h basic status 2h phy identifier 1 3h phy identifier 2 4h auto-negotiation advertisement 5h auto-negotiation link partner ability 6h auto-negotiation expansion 7h auto-negotiation next page 8h link partner next page ability 9h ? 13h reserved 14h mii control 15h rxer counter 16h ? 1ah reserved 1bh interrupt control/status 1ch ? 1dh reserved 1eh phy control 1 1fh phy control 2 register description address name description mode (1) default register 0h ? basic control 0.15 reset 1 = software reset 0 = normal operation this bit is self-cleared after a ?1? is written to it. rw/sc 0 0.14 loop-back 1 = loop-back mode 0 = normal operation rw 0 0.13 speed select (lsb) 1 = 100mbps 0 = 10mbps this bit is ignored if auto-negotiation is enabled (register 0.12 = 1). rw set by speed strapping pin. see ?strapping options? section for details. 0.12 auto- negotiation enable 1 = enable auto-negotiation process 0 = disable auto-negotiation process if enabled, auto-negotiation result overrides settings in register 0.13 and 0.8. rw set by nwayen strapping pin. see ?strapping options? section for details. 0.11 power down 1 = power down mode 0 = normal operation rw 0 0.10 isolate 1 = electrical isolation of phy from mii and tx+/tx- 0 = normal operation rw set by iso strapping pin. see ?strapping options? section for details.
micrel, inc. ksz8041nl/rnl september 2010 33 m9999-090910-1.4 register descrip tion (continued) address name description mode (1) default register 0h ? basic control 0.9 restart auto- negotiation 1 = restart auto-negotiation process 0 = normal operation. this bit is self-cleared after a ?1? is written to it. rw/sc 0 0.8 duplex mode 1 = full-duplex 0 = half-duplex rw inverse of duplex strapping pin value. see ?strapping options? section for details. 0.7 collision test 1 = enable col test 0 = disable col test rw 0 0.6:1 reserved ro 000_000 0.0 disable transmitter 0 = enable transmitter 1 = disable transmitter rw 0 register 1h ? basic status 1.15 100base-t4 1 = t4 capable 0 = not t4 capable ro 0 1.14 100base-tx full duplex 1 = capable of 100mbps full-duplex 0 = not capable of 100mbps full-duplex ro 1 1.13 100base-tx half duplex 1 = capable of 100mbps half-duplex 0 = not capable of 100mbps half-duplex ro 1 1.12 10base-t full duplex 1 = capable of 10mbps full-duplex 0 = not capable of 10mbps full-duplex ro 1 1.11 10base-t half duplex 1 = capable of 10mbps half-duplex 0 = not capable of 10mbps half-duplex ro 1 1.10:7 reserved ro 0000 1.6 no preamble 1 = preamble suppression 0 = normal preamble ro 1 1.5 auto- negotiation complete 1 = auto-negotiation process completed 0 = auto-negotiation process not completed ro 0 1.4 remote fault 1 = remote fault 0 = no remote fault ro/lh 0 1.3 auto- negotiation ability 1 = capable to perform auto-negotiation 0 = not capable to perform auto-negotiation ro 1 1.2 link status 1 = link is up 0 = link is down ro/ll 0 1.1 jabber detect 1 = jabber detected 0 = jabber not detected (default is low) ro/lh 0 1.0 extended capability 1 = supports extended capabilities registers ro 1
micrel, inc. ksz8041nl/rnl september 2010 34 m9999-090910-1.4 register descrip tion (continued) address name description mode (1) default register 2h ? phy identifier 1 2.15:0 phy id number assigned to the 3rd through 18th bits of the organizationally unique identifier (oui). kendin communication?s oui is 0010a1 (hex) ro 0022h register 3h ? phy identifier 2 3.15:10 phy id number assigned to the 19th through 24th bits of the organizationally unique identifier (oui). kendin communication?s oui is 0010a1 (hex) ro 0001_01 3.9:4 model number six bit manufacturer?s model number ro 01_0001 3.3:0 revision number four bit manufacturer?s revision number ro indicates silicon revision register 4h ? auto-negotiation advertisement 4.15 next page 1 = next page capable 0 = no next page capability. rw 0 4.14 reserved ro 0 4.13 remote fault 1 = remote fault supported 0 = no remote fault rw 0 4.12 reserved ro 0 4.11:10 pause [00] = no pause [10] = asymmetric pause [01] = symmetric pause [11] = asymmetric & symmetric pause rw 00 4.9 100base-t4 1 = t4 capable 0 = no t4 capability ro 0 4.8 100base-tx full-duplex 1 = 100mbps full-duplex capable 0 = no 100mbps full-duplex capability rw set by speed strapping pin. see ?strapping options? section for details. 4.7 100base-tx half-duplex 1 = 100mbps half-duplex capable 0 = no 100mbps half-duplex capability rw set by speed strapping pin. see ?strapping options? section for details. 4.6 10base-t full-duplex 1 = 10mbps full-duplex capable 0 = no 10mbps full-duplex capability rw 1 4.5 10base-t half-duplex 1 = 10mbps half-duplex capable 0 = no 10mbps half-duplex capability rw 1 4.4:0 selector field [0000 1] = ieee 802.3 rw 0_0001
micrel, inc. ksz8041nl/rnl september 2010 35 m9999-090910-1.4 register descrip tion (continued) address name description mode (1) default register 5h ? auto-negot iation link partner ability 5.15 next page 1 = next page capable 0 = no next page capability ro 0 5.14 acknowledge 1 = link code word received from partner 0 = link code word not yet received ro 0 5.13 remote fault 1 = remote fault detected 0 = no remote fault ro 0 5.12 reserved ro 0 5.11:10 pause [00] = no pause [10] = asymmetric pause [01] = symmetric pause [11] = asymmetric & symmetric pause ro 00 5.9 100base-t4 1 = t4 capable 0 = no t4 capability ro 0 5.8 100base-tx full-duplex 1 = 100mbps full-duplex capable 0 = no 100mbps full-duplex capability ro 0 5.7 100base-tx half-duplex 1 = 100mbps half-duplex capable 0 = no 100mbps half-duplex capability ro 0 5.6 10base-t full-duplex 1 = 10mbps full-duplex capable 0 = no 10mbps full-duplex capability ro 0 5.5 10base-t half-duplex 1 = 10mbps half-duplex capable 0 = no 10mbps half-duplex capability ro 0 5.4:0 selector field [0000 1] = ieee 802.3 ro 0_0001 register 6h ? auto-negotiation expansion 6.15:5 reserved ro 0000_0000_000 6.4 parallel detection fault 1 = fault detected by parallel detection 0 = no fault detected by parallel detection. ro/lh 0 6.3 link partner next page able 1 = link partner has next page capability 0 = link partner does not have next page capability ro 0 6.2 next page able 1 = local device has next page capability 0 = local device does not have next page capability ro 1 6.1 page received 1 = new page received 0 = new page not received yet ro/lh 0 6.0 link partner auto- negotiation able 1 = link partner has auto-negotiation capability 0 = link partner does not have auto-negotiation capability ro 0
micrel, inc. ksz8041nl/rnl september 2010 36 m9999-090910-1.4 register descrip tion (continued) address name description mode (1) default register 7h ? auto-negotiation next page 7.15 next page 1 = additional next page(s) will follow 0 = last page rw 0 7.14 reserved ro 0 7.13 message page 1 = message page 0 = unformatted page rw 1 7.12 acknowledge2 1 = will comply with message 0 = cannot comply with message rw 0 7.11 toggle 1 = previous value of the transmitted link code word equaled logic one 0 = logic zero ro 0 7.10:0 message field 11-bit wide field to encode 2048 messages rw 000_0000_0001 register 8h ? link partner next page ability 8.15 next page 1 = additional next page(s) will follow 0 = last page ro 0 8.14 acknowledge 1 = successful receipt of link word 0 = no successful receipt of link word ro 0 8.13 message page 1 = message page 0 = unformatted page ro 0 8.12 acknowledge2 1 = able to act on the information 0 = not able to act on the information ro 0 8.11 toggle 1 = previous value of transmitted link code word equal to logic zero 0 = previous value of transmitted link code word equal to logic one ro 0 8.10:0 message field ro 000_0000_0000 register 14h ? mii control 14.15:8 reserved ro 0000_0000 14.7 100base-tx preamble restore 1 = restore received preamble to mii output (random latency) 0 = consume 1-byte preamble before sending frame to mii output for fixed latency rw 0 or 1 (if config[2:0] = 100) see ?strapping options? section for details. 14.6 10base-t preamble restore 1 = restore received preamble to mii output 0 = remove all 7-bytes of preamble before sending frame (starting with sfd) to mii output rw 0 14.5:0 reserved ro 00_0001 register 15h ? rxer counter 15.15:0 rxer counter receive error counter for symbol error frames ro/sc 0000h
micrel, inc. ksz8041nl/rnl september 2010 37 m9999-090910-1.4 register descrip tion (continued) address name description mode (1) default register 1bh ? interrupt control/status 1b.15 jabber interrupt enable 1 = enable jabber interrupt 0 = disable jabber interrupt rw 0 1b.14 receive error interrupt enable 1 = enable receive error interrupt 0 = disable receive error interrupt rw 0 1b.13 page received interrupt enable 1 = enable page received interrupt 0 = disable page received interrupt rw 0 1b.12 parallel detect fault interrupt enable 1 = enable parallel detect fault interrupt 0 = disable parallel detect fault interrupt rw 0 1b.11 link partner acknowledge interrupt enable 1 = enable link partner acknowledge interrupt 0 = disable link partner acknowledge interrupt rw 0 1b.10 link down interrupt enable 1= enable link down interrupt 0 = disable link down interrupt rw 0 1b.9 remote fault interrupt enable 1 = enable remote fault interrupt 0 = disable remote fault interrupt rw 0 1b.8 link up interrupt enable 1 = enable link up interrupt 0 = disable link up interrupt rw 0 1b.7 jabber interrupt 1 = jabber occurred 0 = jabber did not occurred ro/sc 0 1b.6 receive error interrupt 1 = receive error occurred 0 = receive error did not occurred ro/sc 0 1b.5 page receive interrupt 1 = page receive occurred 0 = page receive did not occurred ro/sc 0 1b.4 parallel detect fault interrupt 1 = parallel detect fault occurred 0 = parallel detect fault did not occurred ro/sc 0 1b.3 link partner acknowledge interrupt 1= link partner acknowledge occurred 0= link partner acknowledge did not occurred ro/sc 0 1b.2 link down interrupt 1= link down occurred 0= link down did not occurred ro/sc 0 1b.1 remote fault interrupt 1= remote fault occurred 0= remote fault did not occurred ro/sc 0 1b.0 link up interrupt 1= link up occurred 0= link up did not occurred ro/sc 0
micrel, inc. ksz8041nl/rnl september 2010 38 m9999-090910-1.4 register descrip tion (continued) address name description mode (1) default register 1eh ? phy control 1 1e:15:14 led mode [00] = led1 : speed led0 : link/activity [01] = led1 : activity led0 : link [10], [11] = reserved rw 00 1e.13 polarity 0 = polarity is not reversed 1 = polarity is reversed ro 1e.12 reserved ro 0 1e.11 mdi/mdi-x state 0 = mdi 1 = mdi-x ro 1e:10:8 reserved 1e:7 remote loopback 0 = normal mode 1 = remote (analog) loop back is enable rw 0 1e:6:0 reserved register 1fh ? phy control 2 1f:15 hp_mdix 0 = micrel auto mdi/mdi-x mode 1 = hp auto mdi/mdi-x mode rw 1 1f:14 mdi/mdi-x select when auto mdi/mdi-x is disabled, 0 = mdi mode transmit on tx+/- (pins 7,6) and receive on rx+/- (pins 5,4) 1 = mdi-x mode transmit on rx+/- (pins 5,4) and receive on tx+/- (pins 7,6) rw 0 1f:13 pairswap disable 1 = disable auto mdi/mdi-x 0 = enable auto mdi/mdi-x rw 0 1f.12 energy detect 1 = presence of signal on rx+/- analog wire pair 0 = no signal detected on rx+/- ro 0 1f.11 force link 1 = force link pass 0 = normal link operation this bit bypasses the control logic and allow transmitter to send pattern even if there is no link. rw 0
micrel, inc. ksz8041nl/rnl september 2010 39 m9999-090910-1.4 register descrip tion (continued) address name description mode (1) default 1f.10 power saving 1 = enable power saving 0 = disable power saving if power saving mode is enabled and the cable is disconnected, the rxc clock output (in mii mode) is disabled. rxc clock is enabled after the cable is connected and link is established. rw 0 1f.9 interrupt level 1 = interrupt pin active high 0 = interrupt pin active low rw 0 1f.8 enable jabber 1 = enable jabber counter 0 = disable jabber counter rw 1 1f.7 auto- negotiation complete 1 = auto-negotiation process completed 0 = auto-negotiation process not completed rw 0 1f.6 enable pause (flow control) 1 = flow control capable 0 = no flow control capability ro 0 1f.5 phy isolate 1 = phy in isolate mode 0 = phy in normal operation ro 0 1f.4:2 operation mode indication [000] = still in auto-negotiation [001] = 10base-t half-duplex [010] = 100base-tx half-duplex [011] = reserved [101] = 10base-t full-duplex [110] = 100base-tx full-duplex [111] = reserved ro 000 1f.1 enable sqe test 1 = enable sqe test 0 = disable sqe test rw 0 1f.0 disable data scrambling 1 = disable scrambler 0 = enable scrambler rw 0 note: 1. rw = read/write. ro = read only. sc = self-cleared. lh = latch high. ll = latch low.
micrel, inc. ksz8041nl/rnl september 2010 40 m9999-090910-1.4 absolute maximum ratings (1) supply voltage (v ddpll_1.8 ) ............................................... -0.5v to +2.4v (v ddio_3.3, v dda_3.3 ) ................................... -0.5v to +4.0v input voltage (all input s) ............................... -0.5v to +4.0v output voltage (all outpu ts) .......................... -0.5v to +4.0v lead temperature (solde ring, 10sec .) ....................... 260c storage temperature (t s ) ..........................-55c to +150c esd rating (3) .................................................................. 6kv operating ratings (2) supply voltage (v ddio_3.3, v dda_3.3 ) .......................... +3.135v to +3.465v ambient temperature (t a , commercial)...................................... 0c to +70c (t a , industria l) .......................................-40c to +85c (t a , am automotive qualified) .............-40c to +85c maximum junction temperature (t j max) ................. 125c maximum case temperature (t c max)...................... 150c thermal resistance ( ja ) .........................................34c/w thermal resistance ( jc ) ...........................................6 c/w electrical characteristics (4) symbol parameter condition min typ max units supply current (5) i dd1 100base-tx chip only (no transformer); full-duplex traffic @ 100% utilization 53.0 ma i dd2 10base-t chip only (no transformer); full-duplex traffic @ 100% utilization 38.0 ma i dd3 power saving mode ethernet cable discon nected (reg. 1f.10 = 1) 32.0 ma i dd4 power down mode software power down (reg. 0.11 = 1) 4.0 ma ttl inputs v ih input high voltage 2.0 v v il input low voltage 0.8 v i in input current v in = gnd ~ vddio -10 10 a ttl outputs v oh output high voltage i oh = -4ma 2.4 v v ol output low voltage i ol = 4ma 0.4 v |i oz | output tri-state leakage 10 a led outputs i led output drive current each led pin (led0, led1) 8 ma 100base-tx transmit (measured differentially after 1:1 transformer) v o peak differential output voltage 100 termination across differential output 0.95 1.05 v v imb output voltage imbalance 100 termination across differential output 2 % rise/fall time 3 5 ns rise/fall time imbalance 0 0.5 ns duty cycle distortion + 0.25 ns t r , t f overshoot 5 % v set reference voltage of iset 0.65 v output jitter peak-to-peak 0.7 1.4 ns
micrel, inc. ksz8041nl/rnl september 2010 41 m9999-090910-1.4 electrical characteristics (4) (continued) symbol parameter condition min typ max units 10base-t transmit (measured differentially after 1:1 transformer) v p peak differential output voltage 100 termination across differential output 2.2 2.8 v jitter added peak-to-peak 3.5 ns t r , t f rise/fall time 25 ns 10base-t receive v sq squelch threshold 5mhz square wave 400 mv notes: 1. exceeding the absolute maximum rating may damage the device. stresses greater than the absolute maximum rating may cause per manent damage to the device. operation of the device at these or an y other conditions above those specified in the operating sections of this specification is not implied. maximum conditions fo r extended periods may affect reliability. 2. the device is not guaranteed to function outside its operating rating. 3. devices are esd sensitive. handli ng precautions recommended. human body mo del, 1.5k in series with 100pf. 4. t a = 25 c. specification for packaged product only. 5. current consumption is for the si ngle 3.3v supply ksz8041nl/rnl device only, and includes the 1.8v supply voltage (v ddpll_1.8 ) that is provided by the ksz8041nl/rnl. the phy port?s transform er consumes an additional 45ma @ 3.3v for 100base-tx and 70ma @ 3.3v for 10base-t.
micrel, inc. ksz8041nl/rnl september 2010 42 m9999-090910-1.4 timing diagrams mii sqe timing (10base-t) figure 9. mii sqe timing (10base-t) timing parameter description min typ max unit t p txc period 400 ns t wl txc pulse width low 200 ns t wh txc pulse width high 200 ns t sqe col (sqe) delay after txen de-asserted 2.5 us t sqep col (sqe) pulse duration 1.0 us table 7. mii sqe timing (10base-t) parameters
micrel, inc. ksz8041nl/rnl september 2010 43 m9999-090910-1.4 mii transmit timing (10base-t) figure 10. mii transmit timing (10base-t) timing parameter description min typ max unit t p txc period 400 ns t wl txc pulse width low 200 ns t wh txc pulse width high 200 ns t su1 txd[3:0] setup to rising edge of txc 10 ns t su2 txen setup to rising edge of txc 10 ns t hd1 txd[3:0] hold from rising edge of txc 0 ns t hd2 txen hold from rising edge of txc 0 ns t crs1 txen high to crs asserted latency 160 ns t crs2 txen low to crs de-asserted latency 510 ns table 8. mii transmit timing (10base-t) parameters
micrel, inc. ksz8041nl/rnl september 2010 44 m9999-090910-1.4 mii receive timing (10base-t) figure 11. mii receive timing (10base-t) timing parameter description min typ max unit t p rxc period 400 ns t wl rxc pulse width low 200 ns t wh rxc pulse width high 200 ns t od (rxd[3:0], rxer, rxdv) output delay from rising edge of rxc 182 225 ns t rlat crs to (rxd[3:0], rxer, rxdv) latency 6.5 us table 9. mii receive timing (10base-t) parameters
micrel, inc. ksz8041nl/rnl september 2010 45 m9999-090910-1.4 mii transmit timing (100base-tx) figure 12. mii transmit timing (100base-tx) timing parameter description min typ max unit t p txc period 40 ns t wl txc pulse width low 20 ns t wh txc pulse width high 20 ns t su1 txd[3:0] setup to rising edge of txc 10 ns t su2 txen setup to rising edge of txc 10 ns t hd1 txd[3:0] hold from rising edge of txc 0 ns t hd2 txen hold from rising edge of txc 0 ns t crs1 txen high to crs asserted latency 34 ns t crs2 txen low to crs de-asserted latency 33 ns table 10. mii transmit timing (100base-tx) parameters
micrel, inc. ksz8041nl/rnl september 2010 46 m9999-090910-1.4 mii receive timing (100base-tx) figure 13. mii receive timing (100base-tx) timing parameter description min typ max unit t p rxc period 40 ns t wl rxc pulse width low 20 ns t wh rxc pulse width high 20 ns t od (rxd[3:0], rxer, rxdv) output delay from rising edge of rxc 19 25 ns crs to rxdv latency 140 ns crs to rxd[3:0] latency 52 ns t rlat crs to rxer latency 60 ns table 11. mii receive timing (100base-tx) parameters
micrel, inc. ksz8041nl/rnl september 2010 47 m9999-090910-1.4 rmii timing figure 14. rmii timing ? data received from rmii figure 15. rmii timing ? data input to rmii timing parameter description min typ max unit t cyc clock cycle 20 ns t 1 setup time 4 ns t 2 hold time 2 ns t od output delay 3 9 ns table 12. rmii timing parameters ? ksz8041nl timing parameter description min typ max unit t cyc clock cycle 20 ns t 1 setup time 4 ns t 2 hold time 1 ns t od output delay 9 11 13 ns table 13. rmii timing parameters ? ksz8041rnl
micrel, inc. ksz8041nl/rnl september 2010 48 m9999-090910-1.4 auto-negotiation timing figure 16. auto-negotiation fast link pulse (flp) timing timing parameter description min typ max units t btb flp burst to flp burst 8 16 24 ms t flpw flp burst width 2 ms t pw clock/data pulse width 100 ns t ctd clock pulse to data pulse 55.5 64 69.5 s t ctc clock pulse to clock pulse 111 128 139 s number of clock/data pulse per flp burst 17 33 table 14. auto-negotiation fast link pulse (flp) timing parameters
micrel, inc. ksz8041nl/rnl september 2010 49 m9999-090910-1.4 mdc/mdio timing figure 17. mdc/mdio timing timing parameter description min typ max unit t p mdc period 400 ns t 1md1 mdio (phy input) setup to rising edge of mdc 10 ns t md2 mdio (phy input) hold from rising edge of mdc 4 ns t md3 mdio (phy output) delay from rising edge of mdc 222 ns table 15. mdc/mdio timing parameters
micrel, inc. ksz8041nl/rnl september 2010 50 m9999-090910-1.4 reset timing the ksz8041nl/rnl reset timing requirement is summarized in the following figure and table. figure 18. reset timing parameter description min max units t sr stable supply voltage to reset high 10 ms t cs configuration setup time 5 ns t ch configuration hold time 5 ns t rc reset to strap-in pin output 6 ns table 16. reset timing parameters after the de-assertion of reset, it is recommended to wait a minimum of 100 us before starting programming on the miim (mdc/mdio) interface.
micrel, inc. ksz8041nl/rnl september 2010 51 m9999-090910-1.4 reset circuit the reset circuit in figure 19 is recommended for powering up the ksz8041nl/rnl if reset is triggered by the power supply. ksz8041nl/rnl 3.3v d1 d1: 1n4148 r 10k c 10uf rst# figure 19. recommended reset circuit the reset circuit in figure 20 is recommended for applications where reset is driven by another device (e.g., cpu or fpga). at power-on-reset, r, c and d1 provide the necessary ramp rise ti me to reset the ksz8041nl/rnl device. the rst_out_n from cpu/fpga provides the warm reset after power up. ksz8041nl/rnl cpu/fpga 3.3v c 10uf r 10k rst_out_n d1 d2 d1, d2: 1n4148 rst# figure 20. recommended reset circuit for interfacing with cpu/fpga reset output.
micrel, inc. ksz8041nl/rnl september 2010 52 m9999-090910-1.4 reference circuits fo r led strapping pins the figure 21 shows the reference circuits for pull-up, float and pull-down on the led1 and led0 strapping pins. led pin 3.3v pull-up ksz8041nl/rnl 3.3v float ksz8041nl/rnl led pin 3.3v pull-down ksz8041nl/rnl led pin figure 21. reference circuits for led strapping pins
micrel, inc. ksz8041nl/rnl september 2010 53 m9999-090910-1.4 selection of isolation transformer a 1:1 isolation transformer is required at the line interface. an isolation transformer with integrated common-mode chokes is recommended for exceeding fcc requirements. the table 17 gives recommended transformer characteristics. parameter value test condition turns ratio 1 ct : 1 ct open-circuit inductance (min.) 350 h 100mv, 100khz, 8ma leakage inductance (max.) 0.4 h 1mhz (min.) inter-winding capacitance (typ.) 12pf d.c. resistance (typ.) 0.9 insertion loss (max.) -1.0db 0mhz ? 65mhz hipot (min.) 1500vrms table 17. transformer selection criteria magnetic manufacturer part number auto mdi-x number of port bel fuse s558-5999-u7 yes 1 bel fuse (mag jack) si-46001 yes 1 bel fuse (mag jack) si-50170 yes 1 delta lf8505 yes 1 lankom lf-h41s yes 1 pulse h1102 yes 1 pulse (low cost) h1260 yes 1 transpower hb726 yes 1 tdk (mag jack) tla-6t718 yes 1 table 18. qualified single port magnetics selection of reference crystal characteristics value units frequency 25 mhz frequency tolerance (max) 50 ppm load capacitance 20 pf series resistance 40 table 19. typical reference crystal characteristics
micrel, inc. ksz8041nl/rnl september 2010 54 m9999-090910-1.4 package information 32-pin (5mm x 5mm) mlf? 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 belie ved to be accurate and reliable. however, no responsibility is a ssumed 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 authori zed for use as components in life support app liances, devices or systems where malfu nction of a product can reasonably be expected to result in pers onal injury. life support devices or system s are devices or systems that (a) are in tended 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 produc ts for use in life support app liances, devices or systems is a purchaser?s own risk a nd purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2006 micrel, incor p orated.

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