View XRT83VSH28IB_4079587.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

exar corporation 48720 kato road, fremont ca, 94538 ? (510) 668-7000 fax (510) 668-7017 www.exar.com preliminary xrt83vsh28 8-channel e1 short-haul line interface unit august 2006 rev. p1.0.0 general description the xrt83vsh28 is a fully integrated 8-channel short-haul line interface unit (liu) that operates from a 1.8v and a 3.3v power supply. using internal termination, the liu provides one bill of materials to operate in e1 75 ? or 120 ? mode with minimum external components. the liu features are programmed through a standard parallel or serial microprocessor interface. exar?s liu has patented high impedance circuits that allow the transmitter outputs and receiver inputs to be high impedance when experiencing a power failure or when the liu is powered off. key design features within the liu optimize 1:1 or 1+1 redundancy and non-intrusive monitoring applications to ensure reliability without using relays. the on-chip clock synthesizer generates an e1 clock reference. additional features include rlos, a 16-bit lcv counter for each channel, ais, qrss generation/ detection, taos, dmo, and diagnostic loopback modes. applications ? isdn primary rate interface ? csu/dsu e1 interface ? e1 lan/wan routers ? public switching systems and pbx interfaces ? e1 multiplexer and channel banks f igure 1. b lock d iagram of the xrt83vsh28 e1 liu (h ost m ode ) 1 of 8 channels, channel _n hw/ host wr_r/w rd_ds ale-as cs rdy_ dtack/ sdo int ser_ par ict tpos_n/ tdata_n t neg_n/ codes_n tclk_n rclk_n rneg_n/lcv_n rpos_n/ rdata_n rlos_n rring_ n master clock synthesizer qrss pattern generator dmo_n ttip_n tring_n txon_n hdb3/ encoder tx/ rx jitter attenuator timing control tx filter & pulse shaper line driver drive monitor hdb3/ decoder tx/ rx jitter attenuator timing & data recovery peak detector & slicer qrss detector ais detector los detector pts1 pts2 d[7:0] pclk/ sclk a[7:0]/ sd i reset microprocessor / serial interface controller test mclke1 mclkout taos rtip_n remote loopback digital loopback analog loopback
xrt83vsh28 preliminary 2 8-channel e1 short-haul line interface unit rev. p1.0.0 f igure 2. b lock d iagram of the xrt83vsh28 e1 liu (h ardware m ode ) 1 of 8 channels, channel _n qrss pattern generator hdb3/ encoder tx/ rx jitter attenuator timing control tx filter & pulse shaper line driver drive monitor hdb3/ decoder tx/ rx jitter attenuator timing & data recovery peak detector & slicer qrss detector ais detector los detector taos remote loopback digital loopback analog loopback hw/ host gauge jasel1 jasel0 rxtsel txtsel terselr xres0 rxres1 ict mclke1 tpos_n/ tdata_n tneg_n/ codes_n tclk_n rclk_n rneg_n/lcv_n rpos_n/ rdata_n rlos_n rtip_n rring_n master clock synthesizer dmo_n ttip_n tring_n txon_n harware control test reset tratio sr/dr eqc[4:0] tclke rclke rxmute ataos mclkout taos_n loop1_n loop0_n
preliminary xrt83vsh28 3 rev. p1.0.0 8-channel e1 short-haul line interface unit features ? fully integrated eight channel short-haul transceivers for e1 (2.048mhz) applications ? internal impedance matching on both receive and transmit for 75 ? (e1) and 120 ? (e1) applications are per port selectable through software without changing components ? power down on a per channel basis with independent receive and transmit selection ? user programable arbitrary pulse mode ? on-chip transmit short-circuit protection and limiting protects line drivers from damage on a per channel basis ? selectable crystal-less digital jitter attenuators (ja) with 32-bit or 64-bit fifo for the receive or transmit path ? driver failure monitor output (dmo) alerts of possible system or external component problems ? transmit outputs and receive inputs may be "high" impedance for protection or redundancy applications on a per channel basis ? support for automatic protection switching ? 1:1 and 1+1 protection without relays ? receive monitor mode handles 0 to 6db resistive attenuation (flat loss) along with 0 to 6db cable loss ? loss of signal (rlos) according to itu-t g.775/ets300233 (e1) ? programmable data stream muting upon rlos detection ? on-chip hdb3 encoder/decoder with an internal 16-bit lcv counter for each channel ? on-chip digital clock recovery circuit for high input jitter tolerance ? qrss/prbs pattern generator and detection for testing and monitoring ? error and bipolar violation insertion and detection ? transmit all ones (taos) generators and detectors ? supports local analog, remote, digital, and dual loopback modes ? supports gapped clocks for mapper/multiplexer applications ? 1.8v inner core ? 3.3v i/o supply operation ? 225 ball bga package ? -40c to +85c temperature range ordering information p art n umber p ackage o perating t emperature r ange XRT83VSH28IB 225 ball bga -40 c to +85 c
xrt83vsh28 preliminary 4 8-channel e1 short-haul line interface unit rev. p1.0.0 dvdd3v3 jtagring rtip_3 rring_3 jtagtip rring_2 rtip_2 rneg_2 gauge dvdd1v8 rtip_6 rring_6 nc ser_ par rring_7 rtip_7 rvdd dgnd 18 rclk_3 rpos_3 tgnd rgnd tvdd ttip_2 rgnd dgnd agnd avdds rpos_6 rgnd rvdd tring_7 rgnd rpos_7 dmo_6 rneg_7 17 rlos_3 rneg_3 ttip_3 rvdd tring_3 tvdd rvdd rclk_2 pts1 rxon int rneg_6 ttip_6 ttip_7 tgnd tgnd rclk_7 tclk_6 16 tclk_2 tneg_3 dmo_2 rpos_2 tgnd tring_2 dgnd rlos_2 rlos_6 dvdd3v3 pts2 rclk_6 tvdd tvdd tring_6 rlos_7 tclk_7 tpos_6 15 jasel0 tpos_2 tclk_3 tpos_3 xrt83vsh28 (top view) 225 ball bga tneg_7 tpos_7 tneg_6 dmo_7 14 txon_0 jasel1 dmo_3 tneg_2 txon_7 pclk txon_5 txon_4 13 a[7] tx0n_3 txon_2 txon_1 txon_6 rxmute test ict 12 a[3] a[6] a[5] a[4] tersel0 tersel1 rxtsel txtsel 11 a[1] a[2] a[0] dvdd1v8 rxres1 hw_ host dvdd1v8 rxres0 10 dvdd1v8 dgnd dgnd dvdd3v3 dvdd3v3 dgnd d[1] d[3] 9 reserved reserved reserved dgnd dgnd reset d[2] d[4] 8 ale cs rd _ds wr _r/ w d[0] d[7] d[6] d[5] 7 rdy taos_1 taos_3 taos_0 taos_7 taos_4 taos_5 taos_6 6 taos_2 tneg_1 tpos_0 dmo_0 rvdd dmo_4 tclk_5 tpos_5 tneg_5 5 tpos_1 tclk_0 tneg_0 dmo_1 tvdd tvdd ttip_1 rlos_1 dvdd3v3 sr/ dr agnd rneg_5 tring_5 dmo_5 tvdd rneg_4 tneg_4 tpos_4 4 tclk_1 rclk_0 rlos_0 tgnd ttip_0 tring_1 rgnd rclk_1 avdd agnd rclk_5 rpos_5 rvdd tgnd tgnd tclk_4 rclk_4 rlos_4 3 rneg_0 rpos_0 rvdd rgnd tring_o tgnd rpos_1 rneg_1 avdd dgnd rlos_5 rgnd ttip_5 tring_4 ttip_4 rgnd rpos_4 rvdd 2 dgnd tdo rtip_0 rring_0 tms rring_1 rtip_1 mclkout mclke1 reserved rtip_5 rring_5 tck tvdd tdi rring_4 rtip_4 dvdd1v8 1 a b c d e f g h j k l m n p r t u v
preliminary xrt83vsh28 i rev. p1.0.0 8-channel e1 short-haul line interface unit general description................................................................................................. 1 a pplications ............................................................................................................................... ................ 1 f igure 1. b lock d iagram of the xrt83vsh28 e1 liu (h ost m ode )........................................................................................ 1 f igure 2. b lock d iagram of the xrt83vsh28 e1 liu (h ardware m ode ) ............................................................................... 2 f eatures ............................................................................................................................... ...................... 3 ordering information ........................................................................................................... ......... 3 pin description by function................................................................................... 5 r eceive s ection ............................................................................................................................... .......... 5 t ransmit s ection ............................................................................................................................... ........ 8 p arallel m icroprocessor i nterface ..................................................................................................... 10 jitter a ttenuator ............................................................................................................................... ..... 12 c lock s ynthesizer ............................................................................................................................... .... 12 a larm f unctions /r edundancy s upport ................................................................................................. 14 s erial m icroprocessor i nterface ......................................................................................................... 16 p ower and g round ............................................................................................................................... ... 16 functional description ......................................................................................... 19 1.0 hardware mode vs host mode .............................................................................................. .. 19 1.1 feature differences in hardware mode .................................................................................... .. 19 t able 1: d ifferences b etween h ardware m ode and h ost m ode .......................................................................................... 19 2.0 receive path line interface ............................................................................................. ....... 20 f igure 3. s implified b lock d iagram of the r eceive p ath ...................................................................................................... 20 2.1 line termination (rtip/rring) ........................................................................................... ................... 20 2.1.1 case 1: internal termination........................................................................................... ............................... 20 t able 2: s electing the i nternal i mpedance ............................................................................................................................. 20 f igure 4. t ypical c onnection d iagram u sing i nternal t ermination .................................................................................... 20 2.1.2 case 2: internal termination with one external fixed resistor for all modes .................... 21 t able 3: s electing the v alue of the e xternal f ixed r esistor ............................................................................................. 21 f igure 5. t ypical c onnection d iagram u sing o ne e xternal f ixed r esistor ....................................................................... 21 2.2 clock and data recovery ................................................................................................. .................. 22 f igure 6. r eceive d ata u pdated on the r ising e dge of rclk .............................................................................................. 22 f igure 7. r eceive d ata u pdated on the f alling e dge of rclk ............................................................................................ 22 t able 4: t iming s pecifications for rclk/rpos/rneg .......................................................................................................... 22 2.2.1 receive sensitivity .................................................................................................... .......................................... 23 f igure 8. t est c onfiguration for m easuring r eceive s ensitivity ........................................................................................ 23 2.2.2 interference margin .................................................................................................... ..................................... 23 f igure 9. t est c onfiguration for m easuring i nterference m argin .................................................................................... 23 2.2.3 general alarm detection and interrupt generation ....................................................................... . 23 2.3 receive jitter attenuator ............................................................................................... ................... 24 2.4 hdb3 decoder ............................................................................................................ ................................ 25 2.5 rpos/rneg/rclk .......................................................................................................... .............................. 25 f igure 10. s ingle r ail m ode w ith a f ixed r epeating "0011" p attern ................................................................................... 25 f igure 11. d ual r ail m ode w ith a f ixed r epeating "0011" p attern ...................................................................................... 25 2.6 rxmute (receiver los with data muting) .................................................................................. ..... 26 f igure 12. s implified b lock d iagram of the r x mute f unction ............................................................................................ 26 3.0 transmit path line interface ............................................................................................ ..... 27 f igure 13. s implified b lock d iagram of the t ransmit p ath ................................................................................................... 27 3.1 tclk/tpos/tneg digital inputs ........................................................................................... ................. 27 f igure 14. t ransmit d ata s ampled on f alling e dge of tclk ............................................................................................... 27 f igure 15. t ransmit d ata s ampled on r ising e dge of tclk ................................................................................................. 27 t able 5: t iming s pecifications for tclk/tpos/tneg ........................................................................................................... 28 3.2 hdb3 encoder ............................................................................................................ ................................ 28 t able 6: e xamples of hdb3 e ncoding ............................................................................................................................... ....... 28 3.3 transmit jitter attenuator .............................................................................................. ................. 29 t able 7: m aximum g ap w idth for m ultiplexer /m apper a pplications .................................................................................... 29 3.4 taos (transmit all ones) ................................................................................................ ..................... 29 f igure 16. taos (t ransmit a ll o nes ).............................................................................................................................. ........ 29 3.5 transmit diagnostic features ............................................................................................ .............. 29 3.5.1 ataos (automatic transmit all ones).................................................................................... ..................... 29 f igure 17. s implified b lock d iagram of the ataos f unction ............................................................................................... 30 3.5.2 qrss generation........................................................................................................ .......................................... 30 t able 8: r andom b it s equence p olynomials ........................................................................................................................... 30
xrt83vsh28 preliminary ii 8-channel e1 short-haul line interface unit rev. p1.0.0 3.5.3 arbitrary pulse generator for e1 ....................................................................................... ...................... 30 f igure 18. a rbitrary p ulse s egment a ssignment .................................................................................................................. 30 3.6 dmo (digital monitor output) ............................................................................................ ................. 30 3.7 line termination (ttip/tring) ........................................................................................... .................... 31 f igure 19. t ypical c onnection d iagram u sing i nternal t ermination ................................................................................... 31 4.0 e1 applications ......................................................................................................... .....................32 4.1 loopback diagnostics ............ ........................................................................................ ...................... 32 4.1.1 local analog loopback .................................................................................................. ................................ 32 f igure 20. s implified b lock d iagram of l ocal a nalog l oopback ......................................................................................... 32 4.1.2 remote loopback ........................................................................................................ ........................................ 32 f igure 21. s implified b lock d iagram of r emote l oopback .................................................................................................... 32 4.1.3 digital loopback ....................................................................................................... .......................................... 33 f igure 22. s implified b lock d iagram of d igital l oopback ..................................................................................................... 33 4.1.4 dual loopback .......................................................................................................... ........................................... 33 f igure 23. s implified b lock d iagram of d ual l oopback ........................................................................................................ 33 4.2 line card redundancy .................................................................................................... ....................... 34 4.2.1 1:1 and 1+1 redundancy without relays ................... ............................................................... .................. 34 4.2.2 transmit interface with 1:1 and 1+1 redundancy .......... ............................................................... ......... 34 f igure 24. s implified b lock d iagram of the t ransmit i nterface for 1:1 and 1+1 r edundancy ......................................... 34 4.2.3 receive interface with 1:1 and 1+1 redundancy.......................................................................... ........... 35 f igure 25. s implified b lock d iagram of the r eceive i nterface for 1:1 and 1+1 r edundancy ........................................... 35 4.2.4 n+1 redundancy using external relays .................... ............................................................... ................ 36 4.2.5 transmit interface with n+1 redundancy ................................................................................. ............... 36 f igure 26. s implified b lock d iagram of the t ransmit i nterface for n+1 r edundancy ...................................................... 36 4.2.6 receive interface with n+1 redundancy .................. ................................................................ ................. 37 f igure 27. s implified b lock d iagram of the r eceive i nterface for n+1 r edundancy ........................................................ 37 4.3 power failure protection ................................................................................................ .................. 38 4.4 overvoltage and overcurrent protec tion ............................................................................... 38 4.5 non-intrusive monitoring ................................................................................................ .................... 38 f igure 28. s implified b lock d iagram of a n on -i ntrusive m onitoring a pplication ............................................................... 38 5.0 microprocessor interface ................................................................................................ ......39 5.1 serial microprocessor interface block (bga package only) ........................................... 39 f igure 29. s implified b lock d iagram of the s erial m icroprocessor i nterface ................................................................. 39 5.1.1 serial timing information .............................................................................................. .................................. 39 f igure 30. t iming d iagram for the s erial m icroprocessor i nterface ................................................................................ 39 5.1.2 24-bit serial data input descritption .................................................................................. ....................... 40 5.1.3 addr[7:0] (sclk1 - sclk8)............................. ................................................................. ....................................... 40 5.1.4 r/w (sclk9)............................................................................................................ ................................................... 40 5.1.5 dummy bits (sclk10 - sclk16) ........................................................................................... ................................. 40 5.1.6 data[7:0] (sclk17 - sclk24) ............................................................................................ ..................................... 40 5.1.7 8-bit serial data output description ................................................................................... ...................... 40 f igure 31. t iming d iagram for the m icroprocessor s erial i nterface ................................................................................ 41 t able 9: m icroprocessor s erial i nterface t imings ( ta = 250c, vdd=3.3v 5% and load = 10 p f) .................................. 41 5.2 parallel microprocessor interface block .............................................................................. 42 t able 10: s electing the m icroprocessor i nterface m ode ................................................................................................... 42 f igure 32. s implified b lock d iagram of the m icroprocessor i nterface b lock .................................................................. 42 5.3 the microprocessor interface block signals ......................................................................... 43 t able 11: xrt83vsh28 m icroprocessor i nterface s ignals that exhibit constant roles in both i ntel and m otorola m odes 43 t able 12: i ntel mode : m icroprocessor i nterface s ignals .................................................................................................... 43 t able 13: m otorola m ode : m icroprocessor i nterface s ignals ........................................................................................... 44 5.4 intel mode programmed i/o access (a synchronous) ............................................................... 45 f igure 33. i ntel p i nterface s ignals d uring p rogrammed i/o r ead and w rite o perations ............................................ 46 t able 14: i ntel m icroprocessor i nterface t iming s pecifications ........................................................................................ 46 5.5 motorola mode programmed i/o acc ess (asynchronous) .................................................... 47 f igure 34. m otorola 68k p i nterface s ignals d uring p rogrammed i/o r ead and w rite o perations ............................ 48 t able 15: m otorola 68k m icroprocessor i nterface t iming s pecifications ........................................................................ 48 t able 16: m icroprocessor r egister a ddress (addr[7:0]).................................................................................................... 49 t able 17: m icroprocessor r egister c hannel d escription ................................................................................................... 49 t able 18: m icroprocessor r egister 0 x 00 h b it d escription ................................................................................................. 51 t able 19: c able length s etting ............................................................................................................................... ................. 52 t able 20: m icroprocessor r egister 0 x 01 h b it d escription ................................................................................................. 52 t able 21: m icroprocessor r egister 0 x 02 h b it d escription ................................................................................................. 53 t able 22: m icroprocessor r egister 0 x 03 h b it d escription ................................................................................................. 54 t able 23: m icroprocessor r egister 0 x 04 h b it d escription ................................................................................................. 55
preliminary xrt83vsh28 iii rev. p1.0.0 8-channel e1 short-haul line interface unit t able 24: m icroprocessor r egister 0 x 05 h b it d escription ................................................................................................. 56 t able 25: m icroprocessor r egister 0 x 06 h b it d escription ................................................................................................. 57 t able 26: m icroprocessor r egister 0 x 08 h b it d escription ................................................................................................. 58 t able 27: m icroprocessor r egister 0 x 09 h b it d escription ................................................................................................. 58 t able 28: m icroprocessor r egister 0 x 0a h b it d escription ................................................................................................. 59 t able 29: m icroprocessor r egister 0 x 0b h b it d escription ................................................................................................. 59 t able 30: m icroprocessor r egister 0 x 0c h b it d escription ................................................................................................. 59 t able 31: m icroprocessor r egister 0 x 0d h b it d escription ................................................................................................. 59 t able 32: m icroprocessor r egister 0 x 0e h b it d escription ................................................................................................. 60 t able 33: m icroprocessor r egister 0 x 0f h b it d escription ................................................................................................. 60 t able 34: m icroprocessor r egister 0 x 80 h , b it d escription ................................................................................................ 60 t able 35: m icroprocessor r egister 0 x 81 h , b it d escription ................................................................................................ 62 t able 36: m icroprocessor r egister 0 x 82 h b it d escription ................................................................................................. 62 t able 37: m icroprocessor r egister 0 x 83 h b it d escription ................................................................................................. 63 t able 38: m icroprocessor r egister 0 x 8c h b it d escription ................................................................................................. 64 t able 39: m icroprocessor r egister 0 x 8d h b it d escription ................................................................................................. 64 t able 40: m icroprocessor r egister 0 x 8e h b it d escription ................................................................................................. 65 t able 41: m icroprocessor r egister 0 x c0 h b it d escription ................................................................................................. 66 t able 42: m icroprocessor r egister 0 x fe h b it d escription ................................................................................................. 66 t able 43: m icroprocessor r egister 0 x ff h b it d escription ................................................................................................. 66 6.0 electrical characteristics .............................................................................................. ..... 67 t able 44: a bsolute m aximum r atings ............................................................................................................................... ........ 67 t able 45: dc d igital i nput and o utput e lectrical c haracteristics .................................................................................... 67 t able 46: ac e lectrical c haracteristics ............................................................................................................................... 67 t able 47: p ower c onsumption ............................................................................................................................... ................... 68 t able 48: e1 r eceiver e lectrical c haracteristics ................................................................................................................ 68 t able 49: e1 t ransmitter e lectrical c haracteristics .......................................................................................................... 69 p ackage d imensions ............................................................................................................................... .. 70 225 b all p lastic b all g rid a rray (b ottom v iew ) ....................................................................... 70 (19.0 x 19.0 x 1.0 mm )...................................................................................................................... 70 ordering information ........................................................................................................... .......... 71 revisions ...................................................................................................................... ......................... 71
xrt83vsh28 preliminary 5 8-channel e1 short-haul line interface unit rev. p1.0.0 pin description by function receive section s ignal n ame bga l ead # t ype d escription rxon k16 i receiver on hardware mode only this pin is used to enable the receivers for all channels. by default, the receivers are turned on in hardware mode. to turn the receivers off, pull this pin "low". n ote : internally pulled "high" with a 50k ? resistor. rlos0 rlos1 rlos2 rlos3 rlos4 rlos5 rlos6 rlos7 c3 h4 h15 a16 v3 l2 j15 t15 o receive loss of signal when a receive loss of signal occurs according to itu-t g.775, the rlos pin will go "high" for a minimum of one rclk cycle. rlos will remain "high" until the loss of signal condition clears. see the receive loss of signal section of this datasheet for more details. n ote : this pin can be used for redundancy applications to initiate an automatic switch to a backup card. rclk0 rclk1 rclk2 rclk3 rclk4 rclk5 rclk6 rclk7 b3 h3 h16 a17 u3 l3 m15 u16 o receive clock output rclk is the recovered clock from the incoming data stream. if the incoming signal is absent or rtip/rring are in "high-z", rclk maintains its timing by using an internal master clock as its reference. rpos/rneg data can be updated on either edge of rclk selected by rclke. n ote : rclke is a global setting that applies to all 8 channels. rneg/lcv0 rneg/lcv1 rneg/lcv2 rneg/lcv3 rneg/lcv4 rneg/lcv5 rneg/lcv6 rneg/lcv7 a2 h2 h18 b16 t4 m4 m16 v17 o rneg/lcv_of output in dual rail mode, this pin is the receive negative data output. in single rail mode, this pin is a line code violation / counter overflow indicator. if lcv is selected by programming the appropriate global register and if a line code violation, a bi-polar violation, or excessive zeros occur, the lcv pin will pull "high" for a minimum of one rclk cycle. lcv will remain "high" until there are no more violations. however, if of (overflow) is selected the lcv pin will pull "high" if the internal lcv counter is saturated. the lcv pin will remain "high" until the lcv counter is reset. rpos0 rpos1 rpos2 rpos3 rpos4 rpos5 rpos6 rpos7 b2 g2 d15 b17 u2 m3 l17 t17 o rpos/rdata output receive digital output pin. in dual rail mode, this pin is the receive positive data out - put. in single rail mode, this pin is the receive non-return to zero (nrz) data output.
preliminary xrt83vsh28 6 rev. p1.0.0 8-channel e1 short-haul line interface unit rtip0 rtip1 rtip2 rtip3 rtip4 rtip5 rtip6 rtip7 c1 g1 g18 c18 u1 l1 l18 t18 i receive differential tip input rtip is the positive differential input from the line interface. along with the rring signal, these pins should be coupled to a 1:1 transformer for proper operation. rring0 rring1 rring2 rring3 rring4 rring5 rring6 rring7 d1 f1 f18 d18 t1 m1 m18 r18 i receive differential ring input rring is the negative differential input from the line interface. along with the rtip - signal, these pins should be coupled to a 1:1 transformer for proper operation. rxmute t12 i receive data muting hardware mode only this pin is and-ed with each of the rlos functions on a per channel basis. there - fore, if this pin is pulled "high" and a given channel experiences a loss of signal, then the rpos/rneg output pins are automatically pulled "low" to prevent data chatter - ing. to disable this feature, the rxmute pin must be pulled "low". n ote : this pin is internally pulled ?high? with a 50k ? resistor s ignal n ame bga l ead # t ype d escription
xrt83vsh28 preliminary 7 8-channel e1 short-haul line interface unit rev. p1.0.0 rxres1 rxres0 r10 v10 i receive external resistor control pins hardware mode only these pins are used in the receive internal impedance mode for unique applica - tions where an accurate resistor can be used to achieve optimal return loss. when rxres[1:0] are used, the liu automatically sets the internal impedance to match the line build out. for example: if 240 ? is selected, the liu chooses an internal impedance such that the parallel combination equals the impedance chosen by tersel[1:0]. "00" = no external fixed resistor "01" = 240 ? "10" = 210 ? "11" = 150 ? n ote : these pins are internally pulled ?low? with a 50k ? resistor. this feature is available in host mode by programming the appropriate channel register. rclke/ pts1 j16 i receive clock edge hardware mode this pin is used to select which edge of the recovered clock is used to update data to the receiver on the rpos/rneg outputs. by default, data is updated on the risinge edge. to udpdate data on the falling edge, this pin must be pulled "high". host mode pts[2:1] pins are used to select the type of microprocessor to be used for host communication. "00" = 8051 intel asynchronous "01" = 68k motorola asynchronous "11" = mpc8xx power pc synchronous n ote : this pin is internally pulled ?low? with a 50k ? resistor. s ignal n ame bga l ead # t ype d escription
preliminary xrt83vsh28 8 rev. p1.0.0 8-channel e1 short-haul line interface unit transmit section s ignal n ame bga l ead # t ype d escription tclke/pts2 l15 i transmit clock edge hardware mode this pin is used to select which edge of the transmit clock is used to sample data on the transmitter on the tpos/tneg inputs. by default, data is sampled on the falling edge. to sample data on the rising edge, this pin must be pulled "high". host mode pts[2:1] pins are used to select the type of microprocessor to be used for host communication. "00" = 8051 intel asynchronous "01" = 68k motorola asynchronous "11" = mpc8xx power pc synchronous n ote : this pin is internally pulled ?low? with a 50k ? resistor. ttip0 ttip1 ttip2 ttip3 ttip4 ttip5 ttip6 ttip7 e3 g4 f17 c16 r2 n2 n16 p16 o transmit differential tip output ttip is the positive differential output to the line interface. along with the tring signal, these pins should be coupled to a 1:2 step up transformer for proper opera - tion. tring0 tring1 tring2 tring3 tring4 tring5 tring6 tring7 e2 f3 f15 e16 p2 n4 r15 p17 o transmit differential ring output tring is the negative differential output to the line interface. along with the ttip signal, these pins should be coupled to a 1:2 step up transformer for proper opera - tion. tpos0 tpos1 tpos2 tpos3 tpos4 tpos5 tpos6 tpos7 c5 a4 b14 d14 v4 u5 v15 t14 i tpos/tdata input transmit digital input pin. in dual rail mode, this pin is the transmit positive data input. in single rail mode, this pin is the transmit non-return to zero (nrz) data input. n ote : internally pulled "low" with a 50k ? resistor. tneg0 tneg1 tneg2 tneg3 tneg4 tneg5 tneg6 tneg7 c4 b5 d13 b15 u4 v5 u14 r14 i transmitter negative nrz data input in dual rail mode, this signal is the negative-rail input data for the transmitter. in single rail mode, this pin can be left unconnected while in host mode. however, in hardware mode, this pin is used to select the type of encoding/decoding for the e1 data format. connecting this pin ?low? enables hdb3. connecting this pin ?high? selects ami data format. n ote : internally pulled ?low? with a 50k ? resistor.
xrt83vsh28 preliminary 9 8-channel e1 short-haul line interface unit rev. p1.0.0 tclk0 tclk1 tclk2 tclk3 tclk4 tclk5 tclk6 tclk7 b4 a3 a15 c14 t3 t5 v16 u15 i transmit clock input tclk is the input facility clock used to sample the incoming tpos/tneg data. if tclk is absent, pulled "low", or pulled "high", the transmitter outputs at ttip/ tring sends an all zero signal to the line. tpos/tneg data can be sampled on either edge of tclk selected by tclke. n ote : tclke is a global setting that applies to all 8 channels. taos0 taos1 taos2 taos3 taos4 taos5 taos6 taos7 d6 b6 a5 c6 t6 u6 v6 r6 i transmit all ones for channel hardware mode only setting this pin ?high? enables the transmission of an all ones pattern to the line from ttip/tring. if this pin is pulled ?low?, the transmitters operate in normal throughput mode. n ote : internally pulled ?low? with a 50k ? resistor for all channels. this feature is available in host mode by programming the appropriate channel register. txon0 txon1 txon2 txon3 txon4 txon5 txon6 txon7 a13 d12 c12 b12 v13 u13 r12 r13 i transmit on/off input upon power up, the transmitters are powered off. turning the transmitters on or off is selected through the microprocessor interface by programming the appropri - ate channel register while in host mode. however, if txoncntl is set "high" in the appropriate global register or if in hardware mode, the activity of the transmitter outputs is controlled by the txon pins. n ote : txon is ideal for redundancy applications. see the redundancy applications section of this datasheet for more details. internally pulled "low" with a 50k ? resistor. s ignal n ame bga l ead # t ype d escription
preliminary xrt83vsh28 10 rev. p1.0.0 8-channel e1 short-haul line interface unit parallel microprocessor interface s ignal n ame bga l ead # t ype d escription hw/ host t10 i mode control input this pin is used to select host mode or hardware mode. by default, the liu is set in hardware mode. to use host mode, this pin must be pulled "low". n ote : internally pulled ?high? with a 50k ? resistor. wr _r/ w /eqc0 d7 i write input(r/ w )/equalizer control signal 0 host mode this pin is used to communicate a read or write operation according to the which microprocessor is chosen. see the microprocessor section of this datasheet for details. hardware mode eqc[4:0] are used to set the receiver gain, receiver impedance and the transmit line build out. see table 19 for more details. n ote : internally pulled ?low? with a 50k ? resistor. rd _ds/eqc1 c7 i read input (data strobe)/equalizer control signal 1 host mode this pin is used to communicate a read or write operation according to the which microprocessor is chosen. see the microprocessor section of this datasheet for details. hardware mode eqc[4:0] are used to set the receiver gain, receiver impedance and the transmit line build out. see table 19 for more details. n ote : internally pulled ?low? with a 50k ? resistor. ale/eqc2 a7 i address latch input (address strobe) host mode this pin is used to latch the address contents into the internal registers within the liu device. see the microprocessor section of this datasheet for details. hardware mode eqc[4:0] are used to set the receiver gain, receiver impedance and the transmit line build out. see table 19 for more details. n ote : internally pulled ?low? with a 50k ? resistor. cs /eqc3 b7 i chip select input - host mode: host mode this pin is used to initiate communication with the microprocessor interface. see the microprocessor section of this datasheet for details. hardware mode eqc[4:0] are used to set the receiver gain, receiver impedance and the transmit line build out. see table 19 for more details. n ote : internally pulled ?low? with a 50k ? resistor.
xrt83vsh28 preliminary 11 8-channel e1 short-haul line interface unit rev. p1.0.0 rdy /eqc4 a6 i/o ready output (data transfer acknowledge) host mode (parallel microprocessor) if pin ser_ par is pulled "low", this output pin from the microprocessor block is used to inform the local p that the read or write operation has been completed and is waiting for the next command. see the microprocessor section of this datasheet for details. host mode (serial interface) if pin ser_ par is pulled "high", this output pin from the serial interface is used to read back the regsiter contents. see the microprocessor section of this datasheet for details. hardware mode eqc[4:0] are used to set the receiver gain, receiver impedance and the transmit line build out. see table 19 for more details. n ote : internally pulled ?low? with a 50k ? resistor. d[7]/loop14 d[6]/loop04 d[5]/loop15 d[4]/loop05 d[3]/loop16 d[2]/loop06 d[1]/loop17 d[0]/loop07 t7 u7 v7 v8 v9 u8 u9 r7 i/o bi-directional data bust/loopback mode select host mode these pins are used for the 8-bit bi-directional data bus to allow data transfer to and from the microprocessor interface. hardware mode (channels 4 through 7) these pins are used to select the loopback mode. each channel has two loopback pins loop[1:0]. "00" = no loopback "01" = analog local loopback "10" = remote loopback "11" = digital loopback n ote : internally pulled ?low? with a 50k ? resistor. a[7]/loop13 a[6]/loop03 a[5]/loop12 a[4]/loop02 a[3]/loop11 a[2]/loop01 a[1]/loop10 a[0]/loop00 a12 b11 c11 d11 a11 b10 a10 c10 i direct address bus/loopback mode select host mode these pins are used for the 8-bit direct address bus to allow access to the internal registers within the microprocessor interface. hardware mode (channels 0 through 3) these pins are used to select the loopback mode. each channel has two loopback pins loop[1:0]. "00" = no loopback "01" = analog local loopback "10" = remote loopback "11" = digital loopback n ote : internally pulled ?low? with a 50k ? resistor. s ignal n ame bga l ead # t ype d escription
preliminary xrt83vsh28 12 rev. p1.0.0 8-channel e1 short-haul line interface unit jitter attenuator clock synthesizer pclk/ataos t13 i synchronous microprocessor clock/automatic transmit all ones host mode this synchronous input clock is used as the internal master clock to the microproces - sor interface when configured for in a synchronous mode. hardware mode this pin is used select an all ones signal to the line interface through ttip/tring any time that a loss of signal occurs. this feature is avaiable in host mode by program - ming the appropriate global register. n ote : internally pulled ?low? with a 50k ? resistor. int l16 o interrupt output host mode this signal is asserted "low" when a change in alarm status occurs. once the status registers have been read, the interrupt pin will return "high". gie (global interrupt enable) must be set "high" in the appropriate global register to enable interrupt gen - eration. n otes : 1. this pin is an open-drain output that requires an external 10k ? pull-up resistor. 2. this pin has an internal pull-down 50k ? resistor s ignal n ame bga l ead # t ype d escription jasel0 jasel1 a14 b13 i jitter attenuator select pins hardware mode jasel[1:0] pins are used to place the jitter attenuator in the transmit path, the receive path or to disable it. n ote : these pins are internally pulled ?low? with 50k ? resistors. s ignal n ame bga l ead # t ype d escription mclkout h1 o synthesized master clock output this signal is the output of the master clock synthesizer pll which is at e1 rate. s ignal n ame bga l ead # t ype d escription disabled transmit receive receive ja path ja bw hz -------- 32/32 32/32 64/64 fifo size ----- 10 10 1.5 0 0 1 1 jasel1 0 1 0 1 jasel0 e1
xrt83vsh28 preliminary 13 8-channel e1 short-haul line interface unit rev. p1.0.0 nc k1 i no connect this pin should be tied to gnd. n ote : this pin is internally pulled "low" with a 50k ? resistor. mclke1 j1 i e1 master clock input a 2.048mhz clock for with an accuracy of better than 50ppm and a duty cycle of 40% to 60% can be provided at this pin. n ote : this pin is internally pulled ?low? with a 50k ? resistor. nc nc nc a8 b8 c8 i no connect these pins should be tied to gnd. n ote : these pins are internally pulled ?low? with a 50k ? resistor. s ignal n ame bga l ead # t ype d escription
preliminary xrt83vsh28 14 rev. p1.0.0 8-channel e1 short-haul line interface unit alarm functions/redundancy support s ignal n ame bga l ead # t ype d escription gauge j18 i twisted pair cable wire gauge select hardware mode only this pin is used to match the frequency characteristics according to the gauge of wire used in telecom circuits. by default, the liu is matched to 22 gauge or 24 gauge wire. to select 26 gauge, this pin must be pulled "high". n ote : internally pulled ?low? with a 50k ? resistor. dmo0 dmo1 dmo2 dmo3 dmo4 dmo5 dmo6 dmo7 d5 d4 c15 c13 r5 p4 u17 v14 o digital monitor output when no transmit output pulse is detected for more than 128 tclk cycles within the transmit output buffer, the dmo pin will go "high" for a minimum of one tclk cycle. dmo will remain "high" until the transmitter sends a valid pulse. n ote : this pin can be used for redundancy applications to initiate an automatic switch to a backup card. reset t8 i hardware reset input active low signal. when this pin is pulled "low" for more than 10s, the internal reg - isters are set to their default state. see the register description for the default val - ues. n ote : internally pulled "high" with a 50k ? resistor. sr/ dr k4 i single-rail/dual-rail data format hardware mode only this pin is used to control the data format on the facility side of the liu to interface to a framer or mapper/asic device. by default, dual rail mode is selected which relies upon the framer to handle the encoding/decoding functions. to select single rail mode, this pin must be pulled "high". if single rail mode is selected, the liu can encode/decode ami or hdb3 data formats. n ote : internally pulled ?low? with a 50k ? resistor. rxtsel u11 i receiver termination select hardware mode this pin is used to select between the internal and external impedance modes for the receive path. by default, the receivers are configured for external impedance mode, which is ideal for redundancy applications without relays. to select internal impedance, this pin must be pulled "high". host mode internal/external impedance can be selected by programming the appropriate chan - nel registers. however, to assist in redundancy applications, this pin can be used for a hard switch if the rxtcntl bit is set "high" in the appropriate global register. if rxtcntl is set "high", the individual rxtsel register bits are ignored. n ote : this pin is internally pulled ?low? with a 50k ? resistor. txtsel v11 i transmitter termination select hardware mode this pin is used to select between the internal and external impedance modes for the transmit path. by default, the receivers are configured for external impedance mode, which is ideal for redundancy applications without relays. to select internal impedance, this pin must be pulled "high". n ote : this pin is internally pulled "low".
xrt83vsh28 preliminary 15 8-channel e1 short-haul line interface unit rev. p1.0.0 tersel1 tersel0 t11 r11 i termination impedance select hardware mode only the tersel[1:0] pins are used to select the transmitter and receiver impedance. by default, the impedance is set to 100 ? . "00" = reserved "01" = reserved "10" = 75 ? "11" = 120 ? n ote : these pins are internally pulled "low" with a 50k ? resistor. test u12 i factory test mode for normal operation, the test pin should be tied to ground. n ote : internally pulled "low" with a 50k ? resistor. ict v12 i in circuit testing when this pin is tied "low", all output pins are forced to "high" impedance for in cir - cuit testing. n ote : internally pulled "high" with a 50k ? resistor. s ignal n ame bga l ead # t ype d escription
preliminary xrt83vsh28 16 rev. p1.0.0 8-channel e1 short-haul line interface unit serial microprocessor interface power and ground s ignal n ame bga l ead # t ype d escription ser_ par p18 i serial/parallel select input (host mode only) this pin is used in the host mode to select between the parallel microprocessor or serial interface. by default, the host mode operates in the parallel micropro - cessor mode. to configure the device for a serial interface, this pin must be pulled "high". n ote : internally pulled ?low? with a 50k ? resistor. sclk t13 i serial clock input (host mode only) if pin ser_ par is pulled "high", this input pin is used the timing reference for the serial microprocessor interface. see the microprocessor section of this datasheet for details. sdi c10 i serial data input (host mode only) if pin ser_ par is pulled "high", this input pin from the serial interface is used to input the serial data for read and write operations. see the microprocessor section of this datasheet for details. sdo r7 o serial data output (host mode only) if pin ser_ par is pulled "high", this output pin from the serial interface is used to read back the regsiter contents. see the microprocessor section of this datasheet for details. jtagtip jtagring e18 b18 analog jtag positive pin analog jtag negative pin tdo b1 test data out this pin is used as the output data pin for the boundary scan chain. tdi r1 test data in this pin is used as the input data pin for the boundary scan chain. tck n1 test clock input this pin is used as the input clock source for the boundary scan chain. tms e1 test mode select this pin is used as the input mode select for the boundary scan chain. sense n18 **** factory test pin s ignal n ame bga l ead # t ype d escription tgnd d3 f2 e15 c17 r3 p3 t16 r16 **** transmitter analog ground it?s recommended that all ground pins of this device be tied together.
xrt83vsh28 preliminary 17 8-channel e1 short-haul line interface unit rev. p1.0.0 tvdd e4 f4 f16 e17 r4 p1 n15 p15 **** transmit analog power supply (3.3v 5%) tvdd can be shared with dvdd. however, it is recommended that tvdd be isolated from the analog power supply rvdd. for best results, use an internal power plane for isolation. if an internal power plane is not available, a ferrite bead can be used. each power supply pin should be bypassed to ground through an external 0.1 f capacitor. rvdd c2 e5 g16 d16 v2 n3 n17 u18 **** receive analog power supply (3.3v 5%) rvdd should not be shared with other power supplies. it is recommended that rvdd be isolated from the digital power supply dvdd and the analog power supply tvdd. for best results, use an internal power plane for isolation. if an internal power plane is not available, a ferrite bead can be used. each power supply pin should be bypassed to ground through an external 0.1 f capacitor. rgnd d2 g3 g17 d17 t2 m2 m17 r17 **** receiver analog ground it?s recommended that all ground pins of this device be tied together. avdd-bias k17 j3 j2 **** analog power supply (1.8v 5%) avdd should be isolated from the digital power supplies. for best results, use an internal power plane for isolation. if an internal power plane is not available, a ferrite bead can be used. each power supply pin should be bypassed to ground through at least one 0.1 f capacitor. agnd j17 k3 l4 **** analog ground it?s recommended that all ground pins of this device be tied together. dvdd3v3 a18 r9 d9 k15 j4 **** digital power supply (3.3v 5%) dvdd should be isolated from the analog power supplies. for best results, use an internal power plane for isolation. if an internal power plane is not available, a ferrite bead can be used. every two dvdd power supply pins should be bypassed to ground through at least one 0.1 f capacitor. dvdd1v8 v1 u10 k18 d10 a9 **** digital power supply (1.8v 5%) dvdd should be isolated from the analog power supplies. for best results, use an internal power plane for isolation. if an internal power plane is not available, a ferrite bead can be used. every two dvdd power supply pins should be bypassed to ground through at least one 0.1 f capacitor. n ote : for proper operation, the power-up sequence is: bring up 1.8v power befor the 3.3v. s ignal n ame bga l ead # t ype d escription
preliminary xrt83vsh28 18 rev. p1.0.0 8-channel e1 short-haul line interface unit dgnd a1 r8 t9 h17 b9 d8 c9 g15 k2 v18 **** digital ground it?s recommended that all ground pins of this device be tied together. s ignal n ame bga l ead # t ype d escription
xrt83vsh28 preliminary 19 8-channel e1 short-haul line interface unit rev. p1.0.0 functional description the xrt83vsh28 is a fully integrated 8-channel short-haul line interface unit (liu) that operates from a 1.8v and a 3.3v power supply. the liu features are programmed through a standard microprocessor interface or controlled through hardware mode. exar?s liu has patented high impedance circuits that allow the transmitter outputs and receiver inputs to be high impedance when experiencing a power failure or when the liu is powered off. key design features within the liu optimize 1:1 or 1+1 redundancy and non-intrusive monitoring applications to ensure reliability without using relays. additional features include rlos, a 16-bit lcv counter for each channel, ais, qrss generation/detection, network loop code generation/detection, taos, dmo, and diagnostic loopback modes. 1.0 hardware mode vs host mode the liu supports a parallel or serial microprocessor interface (host mode) for programming the internal features, or a hardware mode that can be used to configure the device. 1.1 feature differences in hardware mode some features within the hardware mode are not supported on a per channel basis. the differences between hardware mode and host mode are descibed below in table 1 . t able 1: d ifferences b etween h ardware m ode and h ost m ode f eature h ost m ode h ardware m ode tx test patterns fully supported qrss diagnostic patterns are not available in hardware mode. the taos feature is available. rxres[1:0] per channel in hardware mode, rxres[1:0] is a global setting that applies to all channels. tersel[1:0] per channel in hardware mode, tersel[1:0] is a global setting that applies to all channels. eqc[4:0] per channel in hardware mode, the eqc[4:0] is a global setting that applies to all channels. dual loopback fully supported in hardware mode, dual loopback mode is not supported. remote, analog local, and digital loopback modes are available. jasel[1:0] per channel in hardware mode, the jitter attenuator selection is a global setting that applies to all channels. rxtsel per channel in hardware mode, the receive termination select is a global set - ting that applies to all channels. txtsel per channel in hardware mode, the transmit termination select is a global set - ting that applies to all channels.
preliminary xrt83vsh28 20 rev. p1.0.0 8-channel e1 short-haul line interface unit 2.0 receive path line interface the receive path of the xrt83vsh28 liu consists of 8 independent e1 receivers. the following section describes the complete receive path from rtip/rring inputs to rclk/rpos/rneg outputs. a simplified block diagram of the receive path is shown in figure 3 . f igure 3. s implified b lock d iagram of the r eceive p ath 2.1 line termination (rtip/rring) 2.1.1 case 1: internal termination the input stage of the receive path accepts standard e1 twisted pair or e1 coaxial cable inputs through rtip and rring. the physical interface is optimized by placing the terminating impedance inside the liu. this allows one bill of materials for all modes of operation reducing the number of external components necessary in system design. the receive termination impedance is selected by programming tersel[1:0] to match the line impedance. selecting the internal impedance is shown in table 2 . the xrt83vsh28 has the ability to switch the internal termination to "high" impedance by programming rxtsel in the appropriate channel register. for internal termination, set rxtsel to "1". by default, rxtsel is set to "0" ("high" impedance). for redundancy applications, a dedicated hardware pin (rxtsel) is also available to control the receive termination for all channels simultaneously. this hardware pin takes priority over the register setting if rxtcntl is set to "1" in the appropriate global register. if rxtcntl is set to "0", the state of this pin is ignored. see figure 4 for a typical connection diagram using the internal termination. f igure 4. t ypical c onnection d iagram u sing i nternal t ermination t able 2: s electing the i nternal i mpedance tersel[1:0] r eceive t ermination 0h (00) reserved 1h (01) reserved 2h (10) 75 ? 3h (11) 120 ? hdb3 decoder rx jitter attenuator clock & data recovery peak detector & slicer rtip rring rclk rneg rpos r tip r ring xrt83vsh28 liu 1:1 internal impedance line interface e1 one bill of materials receiver input
xrt83vsh28 preliminary 21 8-channel e1 short-haul line interface unit rev. p1.0.0 2.1.2 case 2: internal termination with one external fixed resistor for all modes along with the internal termination, a high precision external fixed resistor can be used to optimize the return loss. this external resistor can be used for all modes of operation ensuring one bill of materials. there are three resistor values that can be used by setting the rxres[1:0] bits in the appropriate channel register. selecting the value for the external fixed resistor is shown in table 3 . by default, rxres[1:0] is set to "none" for no external fixed resistor. if an external fixed resistor is used, the xrt83vsh28 uses the parallel combination of the external fixed resistor and the internal termination as the input impedance. see figure 5 for a typical connection diagram using the external fixed resistor. n ote : without the external resistor, the xrt83vsh28 meets all return loss specifications. this mode was created to add flexibility for optimizing return loss by using a high precision external resistor. f igure 5. t ypical c onnection d iagram u sing o ne e xternal f ixed r esistor t able 3: s electing the v alue of the e xternal f ixed r esistor r x res[1:0] e xternal f ixed r esistor 0h (00) none 1h (01) 240 ? 2h (10) 210 ? 3h (11) 150 ? r tip r ring xrt83vsh28 liu 1:1 internal impedance line interface e1 r r=240 ? , 210 ? , or 150 ? receiver input
preliminary xrt83vsh28 22 rev. p1.0.0 8-channel e1 short-haul line interface unit 2.2 clock and data recovery the receive clock (rclk) is recovered by the clock and data recovery circuitry. an internal pll locks on the incoming data stream and outputs a clock that?s in phase with the incoming signal. this allows for multi- channels to arrive from different timing sources and remain independent. in the absence of an incoming signal, rclk maintains its timing by using the internal master clock as its reference. the recovered data can be updated on either edge of rclk. by default, data is updated on the rising edge of rclk. to update data on the falling edge of rclk, set rclke to "1" in the appropriate global register. figure 6 is a timing diagram of the receive data updated on the rising edge of rclk. figure 7 is a timing diagram of the receive data updated on the falling edge of rclk. the timing specifications are shown in table 4 . f igure 6. r eceive d ata u pdated on the r ising e dge of rclk f igure 7. r eceive d ata u pdated on the f alling e dge of rclk n ote : vdd=3.3v 5%, t a =25c, unless otherwise specified t able 4: t iming s pecifications for rclk/rpos/rneg p arameter s ymbol m in t yp m ax u nits rclk duty cycle r cdu 45 50 55 % receive data setup time r su 150 - - ns receive data hold time r ho 150 - - ns rclk to data delay r dy - - 40 ns rclk rise time (10% to 90%) with 25pf loading rclk r - - 40 ns rclk fall time (90% to 10%) with 25pf loading rclk f - - 40 ns rclk rpos or rneg r dy rclk r rclk f r oh rclk rpos or rneg r dy rclk f rclk r r oh
xrt83vsh28 preliminary 23 8-channel e1 short-haul line interface unit rev. p1.0.0 2.2.1 receive sensitivity to meet short haul requirements, the xrt83vsh28 can accept e1 signals that have been attenuated by 12db of flat loss. however, the xrt83vsh28 can tolerate cable loss and flat loss beyond the industry specifications. the receive sensitivity in the short haul mode is approximately 1,800 feet without experiencing bit errors, lof, pattern synchronization, etc. although data integrity is maintained, the rlos function (if enabled) will report an rlos condition according to the receiver loss of signal section in this datasheet. the test configuration for measuring the receive sensitivity is shown in figure 8 . f igure 8. t est c onfiguration for m easuring r eceive s ensitivity 2.2.2 interference margin the interference margin for the xrt83vsh28 is -15db. the test configuration for measuring the interference margin is shown in figure 9 . f igure 9. t est c onfiguration for m easuring i nterference m argin 2.2.3 general alarm detection and interrupt generation the receive path detects rlos, ais, qrpd and fls. these alarms can be individually masked to prevent the alarm from triggering an interrupt. to enable interrupt generation, the global interrupt enable (gie) bit must be set "high" in the appropriate global register. any time a change in status occurs (it the alarms are enabled), the interrupt pin will pull "low" to indicate an alarm has occurred. once the status registers have been read, the int pin will return "high". the status registers are reset upon read (rur). the interrupts are categorized in a hierarchical process block. figure is a simplified block diagram of the interrupt generation process. n ote : the interrupt pin is an open-drain output that requires a 10k ? external pull-up resistor. network analyzer e1 = prbs 2 15 - 1 external loopback xrt83vsh28 8-channel short haul liu cable loss flat loss tx tx rx rx w&g ant20 sinewave generator flat loss w&g ant20 network analyzer cable loss xrt83vsh28 8-channel liu e1 = 1,024khz e1 = prbs 2 15 - 1 tx tx rx rx external loopback
preliminary xrt83vsh28 24 rev. p1.0.0 8-channel e1 short-haul line interface unit 2.2.3.1 rlos (receiver loss of signal) the xrt83vsh28 supports both g.775 or etsi-300-233 rlos detection scheme. in g.775 mode, rlos is declared when the received signal is less than 375mv for 32 consecutive pulse periods (typical). the device clears rlos when the receive signal achieves 12.5% ones density with no more than 15 consecutive zeros in a 32 bit sliding window and the signal level exceeds 425mv (typical). in etsi-300-233 mode the device declares rlos when the input level drops below 375mv (typical) for more than 2048 pulse periods (1msec). the device exits rlos when the input signal exceeds 425mv (typical) and has transitions for more than 32 pulse periods with 12.5% ones density with no more than 15 consecutive zero?s in a 32 bit sliding window. etsi-300-233 rlos detection method is only available in host mode. 2.2.3.2 exlos (extended loss of signal) by enabling the extended loss of signal by programming the appropriate channel register, the digital rlos is extended to count 4,096 consecutive zeros before declaring rlos. by default, exlos is disabled and rlos operates in normal mode. 2.2.3.3 ais (alarm indication signal) the xrt83vsh28 adheres to the itu-t g.775 specification for an all ones pattern. the ais is set to "1" if the incoming signal has 2 or less zeros in a 512-bit window. ais will clear when the incoming signal has 3 or more zeros in the 512-bit window. 2.2.3.4 flsd (fifo limit status detection) the purpose of the fifo limit status is to indicate when the read and write fifo pointers are within a pre- determined range (over-flow or under-flow indication). the flsd is set to "1" if the fifo read and write pointers are within 3-bits. 2.2.3.5 lcvd (line code violation detection) the liu contains 8 independent, 16-bit lcv counters. when the counters reach full-scale, they remain saturated at ffffh until they are reset globally or on a per channel basis. for performance monitoring, the counters can be updated globally or on a per channel basis to place the contents of the counters into holding registers. the liu uses an indirect address bus to access a counter for a given channel. once the contents of the counters have been placed in holding registers, they can be individually read out 8-bits at a time according to the bytesel bit in the appropriate global register. by default, the lsb is placed in the holding register until the bytesel is pulled "high" where upon the msb will be placed in the holding register for read back. once both bytes have been read, the next channel may be selected for read back. by default, the lvc/ofd will be set to a "1" if the receiver is currently detecting line code violations or excessive zeros for hdb3. in ami mode, the lcvd will be set to a "1" if the receiver is currently detecting bipolar violations or excessive zeros. however, if the liu is configured to monitor the 16-bit lcv counter by programming the appropriate global register, the lcv/ofd will be set to a "1" if the counter saturates. 2.3 receive jitter attenuator the receive path has a dedicated jitter attenuator that reduces phase and frequency jitter in the recovered clock. the jitter attenuator uses a data fifo (first in first out) with a programmable depth of 32-bit or 64-bit. if the liu is used for line synchronization (loop timing systems), the ja should be enabled. when the read and write pointers of the fifo are within 2-bits of over-flowing or under-flowing, the bandwidth of the jitter attenuator is widened to track the short term input jitter, thereby avoiding data corruption. when this condition occurs, the jitter attenuator will not attenuate input jitter until the read/write pointer?s position is outside the 2- bit window. the bandwidth is programmable to either 10hz or 1.5hz (1.5hz automatically selects the 64-bit fifo depth). the ja has a clock delay equal to ? of the fifo bit depth. n ote : if the liu is used in a multiplexer/mapper application where stuffing bits are typically removed, the transmit path has a dedicated jitter attenuator to smooth out the gapped clock. see the transmit section of this datasheet.
xrt83vsh28 preliminary 25 8-channel e1 short-haul line interface unit rev. p1.0.0 2.4 hdb3 decoder in single rail mode, rpos can decode ami or hdb3 signals. hdb3 is defined as any block of 4 successive zeros replaced with 000v or b00v, so that two successive v pulses are of opposite polarity to prevent a dc component. if the hdb3 decoder is selected, the receive path removes the v and b pulses so that the original data is output to rpos. 2.5 rpos/rneg/rclk the digital output data can be programmed to either single rail or dual rail formats. figure 10 is a timing diagram of a repeating "0011" pattern in single-rail mode. figure 11 is a timing diagram of the same fixed pattern in dual rail mode. f igure 10. s ingle r ail m ode w ith a f ixed r epeating "0011" p attern f igure 11. d ual r ail m ode w ith a f ixed r epeating "0011" p attern rclk rpos 00 0 1 1 rclk rpos 00 0 1 1 rneg
preliminary xrt83vsh28 26 rev. p1.0.0 8-channel e1 short-haul line interface unit 2.6 rxmute (receiver los with data muting) the receive muting function can be selected by setting rxmute to "1" in the appropriate global register. if selected, any channel that experiences an rlos condition will automatically pull rpos and rneg "low" to prevent data chattering. if rlos does not occur, the rxmute will remain inactive until an rlos on a given channel occurs. the default setting for rxmute is "0" which is disabled. a simplified block diagram of the rxmute function is shown in figure 12 . f igure 12. s implified b lock d iagram of the r x mute f unction rlos rxmute rpos rneg
xrt83vsh28 preliminary 27 8-channel e1 short-haul line interface unit rev. p1.0.0 3.0 transmit path line interface the transmit path of the xrt83vsh28 liu consists of 8 independent e1 transmitters. the following section describes the complete transmit path from tclk/tpos/tneg inputs to ttip/tring outputs. a simplified block diagram of the transmit path is shown in figure 13 . f igure 13. s implified b lock d iagram of the t ransmit p ath 3.1 tclk/tpos/tneg digital inputs in dual rail mode, tpos and tneg are the digital inputs for the transmit path. in single rail mode, tneg has no function and can be left unconnected. the xrt83vsh28 can be programmed to sample the inputs on either edge of tclk. by default, data is sampled on the falling edge of tclk. to sample data on the rising edge of tclk, set tclke to "1" in the appropriate global register. figure 14 is a timing diagram of the transmit input data sampled on the falling edge of tclk. figure 15 is a timing diagram of the transmit input data sampled on the rising edge of tclk. the timing specifications are shown in table 5 . f igure 14. t ransmit d ata s ampled on f alling e dge of tclk f igure 15. t ransmit d ata s ampled on r ising e dge of tclk hdb3 encoder tx jitter attenuator timing control tx pulse shaper & pattern gen line driver ttip tring tclk tneg tpos tclk tpos or tneg tclk r tclk f t ho t su tclk tpos or tneg tclk f tclk r t ho t su
preliminary xrt83vsh28 28 rev. p1.0.0 8-channel e1 short-haul line interface unit n ote : vdd=3.3v 5%, t a =25c, unless otherwise specified 3.2 hdb3 encoder in single rail mode, the liu can encode the tpos input signal to ami or hdb3 data. with hdb3 encoding selected, any sequence with four or more consecutive zeros in the input will be replaced with 000v or b00v, where "b" indicates a pulse conforming to the bipolar rule and "v" representing a pulse violating the rule. an example of hdb3 encoding is shown in table 6 . t able 5: t iming s pecifications for tclk/tpos/tneg p arameter s ymbol m in t yp m ax u nits tclk duty cycle t cdu 30 50 70 % transmit data setup time t su 50 - - ns transmit data hold time t ho 30 - - ns tclk rise time (10% to 90%) tclk r - - 40 ns tclk fall time (90% to 10%) tclk f - - 40 ns t able 6: e xamples of hdb3 e ncoding n umber of p ulses b efore n ext 4 z eros input 0000 hdb3 (case 1) odd 000v hdb3 (case 2) even b00v
xrt83vsh28 preliminary 29 8-channel e1 short-haul line interface unit rev. p1.0.0 3.3 transmit jitter attenuator the xrt83vsh28 liu is ideal for multiplexer or mapper applications where the network data crosses multiple timing domains. as the higher data rates are de-multiplexed down to e1 data, stuffing bits are typically removed which can leave gaps in the incoming data stream. the transmit path has a dedicated jitter attenuator with a 32-bit or 64-bit fifo that is used to smooth the gapped clock into a steady e1 output. the maximum gap width of the 8-channel liu is shown in table 7 . n ote : if the liu is used in a loop timing system, the receive path has a dedicated jitter attenuator. see the receive section of this datasheet. 3.4 taos (transmit all ones) the xrt83vsh28 has the ability to transmit all ones on a per channel basis by programming the appropriate channel register. this function takes priority over the digital data present on the tpos/tneg inputs. for example: if a fixed "0011" pattern is present on tpos in single rail mode and taos is enabled, the transmitter will output all ones. in addition, if digital or dual loopback is selected, the data on the rpos output will be equal to the data on the tpos input. figure 16 is a diagram showing the all ones signal at ttip and tring. f igure 16. taos (t ransmit a ll o nes ) 3.5 transmit diagnostic features in addition to taos, the xrt83vsh28 offers diagnostic features for analyzing network integrity such as ataos and qrss on a per channel basis by programming the appropriate registers. these diagnostic features take priority over the digital data present on tpos/tneg inputs. the transmitters will send the diagnostic code to the line and will be maintained in the digital loopback if selected. when the liu is responsible for sending diagnostic patterns, the liu is automatically placed in the single rail mode. 3.5.1 ataos (automatic transmit all ones) if ataos is selected by programming the appropriate global register, an ami all ones signal will be transmitted for each channel that experiences an rlos condition. if rlos does not occur, the ataos will remain inactive until an rlos on a given channel occurs. a simplified block diagram of the ataos function is shown in figure 17 . t able 7: m aximum g ap w idth for m ultiplexer /m apper a pplications fifo d epth m aximum g ap w idth 32-bit 20 ui 64-bit 50 ui taos 111
preliminary xrt83vsh28 30 rev. p1.0.0 8-channel e1 short-haul line interface unit f igure 17. s implified b lock d iagram of the ataos f unction 3.5.2 qrss generation the xrt83vsh28 can transmit a qrss random sequence to a remote location from ttip/tring. the polynomial is shown in table 8 . 3.5.3 arbitrary pulse generator for e1 the arbitrary pulse generator divides the pulse into eight individual segments. each segment is set by a 7-bit binary word by programming the appropriate channel register. this allows the system designer to set the overshoot, amplitude, and undershoot for a unique line build out. the msb (bit 7) is a sign-bit. if the sign-bit is set to "0", the segment will move in a positive direction relative to a flat line (zero) condition. if this sign-bit is set to "1", the segment will move in a negative direction relative to a flat line condition. the resolution of the dac is typically 60mv per lsb. thus, writing 7-bit = 1111111 will clamp the output at either volt age rail corresponding to a maximum amplitude. a pulse with numbered segments is shown in figure 18 . f igure 18. a rbitrary p ulse s egment a ssignment n ote : by default, the arbitrary segments are programmed to 0x00h. the transmitter outputs will result in an all zero pattern to the line interface. 3.6 dmo (digital monitor output) t able 8: r andom b it s equence p olynomials r andom p attern e1 qrss 2 15 - 1 rlos ataos taos ttip tring tx 1 2 3 4 5 6 7 8 segment register 1 0xn8 2 0xn9 3 0xna 4 0xnb 5 0xnc 6 0xnd 7 0xne 8 0xnf
xrt83vsh28 preliminary 31 8-channel e1 short-haul line interface unit rev. p1.0.0 the driver monitor circuit is used to detect transmit driver failures by monitoring the activities at ttip/tring outputs. driver failure may be caused by a short circuit in the primary transformer or system problems at the transmit inputs. if the transmitter of a channel has no output for more than 128 clock cycles, dmo goes "high" until a valid transmit pulse is detected. if the dmo interrupt is enabled, the change in status of dmo will cause the interrupt pin to go "low". once the status register is read, the interrupt pin will return "high" and the status register will be reset (rur). 3.7 line termination (ttip/tring) the output stage of the transmit path generates standard return-to-zero (rz) signals to the line interface for e1 twisted pair or e1 coaxial cable. the physical interface is optimized by placing the terminating impedance inside the liu. this allows one bill of materials for all modes of operation reducing the number of external components necessary in system design. the transmitter outputs only require one dc blocking capacitor of 0.68 f. for redundancy applications (or simply to tri-state the transmitters), set txtsel to a "1" in the appropriate channel register. a typical transmit interface is shown in figure 19 . f igure 19. t ypical c onnection d iagram u sing i nternal t ermination t tip t ring xrt83vsh28 liu 1:2 internal impedance line interface e1 c=0.68uf one bill of materials transmitter output
preliminary xrt83vsh28 32 rev. p1.0.0 8-channel e1 short-haul line interface unit 4.0 e1 applications this applications section describes common e1 system considerations along with references to application notes available for reference where applicable. 4.1 loopback diagnostics the xrt83vsh28 supports several loopback modes for diagnostic testing. the following section describes the local analog loopback, remote loopback, digital loopback, and dual loopback modes. 4.1.1 local analog loopback with local analog loopback activated, the transmit output data at ttip/tring is internally looped back to the analog inputs at rtip/rring. external inputs at rtip/rring are ignored while valid transmit output data continues to be sent to the line. a simplified block diagram of local analog loopback is shown in figure 20 . f igure 20. s implified b lock d iagram of l ocal a nalog l oopback n ote : the transmit diagnostic features such as taos and qrss take priority over the transmit input data at tclk/tpos/ tneg. 4.1.2 remote loopback with remote loopback activated, the receive input data at rtip/rring is internally looped back to the transmit output data at ttip/tring. the remote loopback includes the receive ja (if enabled). the transmit input data at tclk/tpos/tneg are ignored while valid receive output data continues to be sent to the system. a simplified block diagram of remote loopback is shown in figure 21 . f igure 21. s implified b lock d iagram of r emote l oopback encoder decoder timing control data and clock recovery ja ja tx taos qrss ttip tring rtip rring tclk tpos tneg rclk rpos rneg rx encoder decoder timing control data and clock recovery ja ja tx rx taos qrss ttip tring rtip rring tclk tpos tneg rclk rpos rneg
xrt83vsh28 preliminary 33 8-channel e1 short-haul line interface unit rev. p1.0.0 4.1.3 digital loopback with digital loopback activated, the transmit input data at tclk/tpos/tneg is looped back to the receive output data at rclk/rpos/rneg. the digital loopback mode includes the transmit ja (if enabled). the receive input data at rtip/rring is ignored while valid transmit output data continues to be sent to the line. a simplified block diagram of digital loopback is shown in figure 22 . f igure 22. s implified b lock d iagram of d igital l oopback 4.1.4 dual loopback with dual loopback activated, the remote loopback is combined with the digital loopback. a simplified block diagram of dual loopback is shown in figure 23 . f igure 23. s implified b lock d iagram of d ual l oopback encoder decoder timing control data and clock recovery ja ja tx rx taos qrss ttip tring rtip rring tclk tpos tneg rclk rpos rneg encoder decoder timing control data and clock recovery ja ja tx rx taos qrss ttip tring rtip rring tclk tpos tneg rclk rpos rneg
preliminary xrt83vsh28 34 rev. p1.0.0 8-channel e1 short-haul line interface unit 4.2 line card redundancy telecommunication system design requires signal integrity and reliability. when an e1 primary line card has a failure, it must be swapped with a backup line card while maintaining connectivity to a backplane without losing data. system designers can achieve this by implementing common redundancy schemes with the xrt83vsh28 liu. exar offers features that are tailored to redundancy applications while reducing the number of components and providing system designers with solid reference designs. rlos and dmo if an rlos or dmo condition occurs, the xrt83vsh28 reports the alarm to the individual status registers on a per channel basis. however, for redundancy applications, an rlos or dmo alarm can be used to initiate an automatic switch to the back up card. for this application, two global pins rlos and dmo are used to indicate that one of the 8-channels has an rlos or dmo condition. typical redundancy schemes ? 1:1 one backup card for every primary card (facility protection) ? 1+1 one backup card for every primary card (line protection) ? n+1 one backup card for n primary cards 4.2.1 1:1 and 1+1 redundancy without relays the 1:1 facility protection and 1+1 line protection have one backup card for every primary card. when using 1:1 or 1+1 redundancy, the backup card has its transmitters tri-stated and its receivers in high impedance. this eliminates the need for external relays and provides one bill of materials for all interface modes of operation. for 1+1 line protection, the receiver inputs on the backup card have the ability to monitor the line for bit errors while in high impedance. the transmit and receive sections of the liu device are described separately. 4.2.2 transmit interface with 1:1 and 1+1 redundancy the transmitters on the backup card should be tri-stated. select the appropriate impedance for the desired mode of operation. a 0.68uf capacitor is used in series with ttip for blocking dc bias. see figure 24 . for a simplified block diagram of the transmit section for a 1:1 and 1+1 redundancy. f igure 24. s implified b lock d iagram of the t ransmit i nterface for 1:1 and 1+1 r edundancy e1 line backplane interface primary card backup card xrt83vsh28 tx tx 0.68uf 0.68uf internal impedence 1:2 1:2 xrt83vsh28 internal impedence
xrt83vsh28 preliminary 35 8-channel e1 short-haul line interface unit rev. p1.0.0 4.2.3 receive interface with 1:1 and 1+1 redundancy the receivers on the backup card should be programmed for "high" impedance. since there is no external resistor in the circuit, the receivers on the backup card will not load down the line interface. this key design feature eliminates the need for relays and provides one bill of materials for all interface modes of operation. select the impedance for the desired mode of operation. to swap the primary card, set the backup card to internal impedance, then the primary card to "high" impedance. see figure 25 . for a simplified block diagram of the receive section for a 1:1 redundancy scheme. f igure 25. s implified b lock d iagram of the r eceive i nterface for 1:1 and 1+1 r edundancy "high" impedence internal impedence backplane interface primary card backup card xrt83vsh28 rx e1 line rx 1:1 1:1 xrt83vsh28
preliminary xrt83vsh28 36 rev. p1.0.0 8-channel e1 short-haul line interface unit 4.2.4 n+1 redundancy using external relays n+1 redundancy has one backup card for n primary cards. due to impedance mismatch and signal contention, external relays are necessary when using this redundancy scheme. the relays create complete isolation between the primary cards and the backup card. this allows all transmitters and receivers on the primary cards to be configured in internal impedance, providing one bill of materials for all interface modes of operation. the transmit and receive sections of the liu device are described separately. 4.2.5 transmit interface with n+1 redundancy for n+1 redundancy, the transmitters on all cards should be programmed for internal impedance. the transmitters on the backup card do not have to be tri-stated. to swap the primary card, close the desired relays, and tri-state the transmitters on the failed primary card. a 0.68uf capacitor is used in series with ttip for blocking dc bias. see figure 26 for a simplified block diagram of the transmit section for an n+1 redundancy scheme. f igure 26. s implified b lock d iagram of the t ransmit i nterface for n+1 r edundancy backplane interface primary card xrt83vsh28 tx line interface card 0.68uf e1 line 0.68uf primary card tx 0.68uf primary card tx 0.68uf backup card tx e1 line e1 line internal impedence 1:2 1:2 1:2 xrt83vsh28 xrt83vsh28 xrt83vsh28 internal impedence internal impedence internal impedence
xrt83vsh28 preliminary 37 8-channel e1 short-haul line interface unit rev. p1.0.0 4.2.6 receive interface with n+1 redundancy for n+1 redundancy, the receivers on the primary cards should be programmed for internal impedance. the receivers on the backup card should be programmed for "high" impedance mode. to swap the primary card, set the backup card to internal impedance, then the primary card to "high" impedance. see figure 27 for a simplified block diagram of the receive section for a n+1 redundancy scheme. f igure 27. s implified b lock d iagram of the r eceive i nterface for n+1 r edundancy backplane interface primary card xrt83vsh28 rx line interface card primary card rx primary card rx backup card rx internal impedence e1 line e1 line e1 line 1:1 1:1 1:1 xrt83vsh28 xrt83vsh28 xrt83vsh28 internal impedence internal impedence "high" impedence
preliminary xrt83vsh28 38 rev. p1.0.0 8-channel e1 short-haul line interface unit 4.3 power failure protection for 1:1 or 1+1 line card redundancy in e1 applications, power failure could cause a line card to change the characteristics of the line impedance, causing a degradation in system performance. the xrt83vsh28 was designed to ensure reliability during power failures. the liu has patented high impedance circuits that allow the receiver inputs and the transmitter outputs to be in "high" impedance when the liu experiences a power failure or when the liu is powered off. n ote : for power failure protection, a transformer must be used to couple to the line interface. see the tan-56 application note for more details. 4.4 overvoltage and overcurrent protection physical layer devices such as lius that interface to telecommunications lines are exposed to overvoltage transients posed by environmental threats. an overvoltage transient is a pulse of energy concentrated over a small period of time, usually under a few milliseconds. these pulses are random and exceed the operating conditions of cmos transceiver ics. electronic equipment connecting to data lines are susceptible to many forms of overvoltage transients such as lightning, ac power faults and electrostatic discharge (esd). there are three important standards when designing a telecommunications system to withstand overvoltage transients. ? ul1950 and fcc part 68 ? telcordia (bellcore) gr-1089 ? itu-t k.20, k.21 and k.41 4.5 non-intrusive monitoring in non-intrusive monitoring applications, the transmitters are shut off by setting txon "low". the receivers must be actively receiving data without interfering with the line impedance. the xrt83vsh28?s internal termination ensures that the line termination meets e1 specifications for 75 ? or 120 ? while monitoring the data stream. system integrity is maintained by placing the non-intrusive receiver in "high" impedance, equivalent to that of a 1+1 redundancy application. a simplified block diagram of non-intrusive monitoring is shown in figure 28 . f igure 28. s implified b lock d iagram of a n on -i ntrusive m onitoring a pplication line card transceiver non-intrusive receiver node xrt83vsh28 xrt83vsh28 data traffic
xrt83vsh28 preliminary 39 8-channel e1 short-haul line interface unit rev. p1.0.0 5.0 microprocessor interface the microprocessor interface can be accessed through a standard serial interface (bga package only) or a standard parallel microprocessor interface. the ser_ par pin is used to select between the two. by default, the chip is configured in the parallel microprocessor interace. for serial communication, this pin must be pulled ?high?. 5.1 serial microprocessor interface block (bga package only) the serial microprocessor uses a standard 3-pin serial port with cs , sclk, and sdi for programming the liu. optional pins such as sdo, int , and reset allow the ability to read back contents of the registers, monitor the liu via an interrupt pin, and reset the liu to its default configuration by pulling reset "low" for more than 10 s. a simplified block diagram of the serial microprocessor is shown in figure 29 . 5.1.1 serial timing information the serial port requires 24 bits of data applied to the sdi (serial data input) pin. the serial microprocessor samples sdi on the rising edge of sclk (serial clock input). the data is not latched into the device until all 24 bits of serial data have been sampled. a timing diagram of the serial microprocessor is shown in figure 30 . n ote : for applications without a free running sclk, a minimum of 1 sclk pulse must be applied when cs is ?high?, befrore pulling cs ?low?. f igure 29. s implified b lock d iagram of the s erial m icroprocessor i nterface f igure 30. t iming d iagram for the s erial m icroprocessor i nterface serial microprocessor interface cs sdi sclk sdo reset int hw/host ser_par r/w addr[0] - addr[7] don't care data[0] - data[7] cs sdi sclk 8-bit address 8-bit data 7-bit don't care 1=read 0=write sdo data[0] - data[7] readback
preliminary xrt83vsh28 40 rev. p1.0.0 8-channel e1 short-haul line interface unit 5.1.2 24-bit serial data input descritption the serial data input is sampled on the rising edge of sclk. in readback mode, the serial data output is updated on the falling edge of sclk. the serial data must be applied to the liu lsb first. the 24 bits of serial data are described below. 5.1.3 addr[7:0] (sclk1 - sclk8) the first 8 sclk cycles are used to provide the address to which a read or write operation will occur. addr[0] (lsb) must be sent to the liu first followed by addr[1] and so forth until all 8 address bits have been sampled by sclk. 5.1.4 r/w (sclk9) the next serial bit applied to the liu informs the microprocessor that a read or write operation is desired. if the r/w bit is set to ?0?, the microprocessor is configured for a write operation. if the r/w bit is set to ?1?, the microprocessor is configured for a read operation. 5.1.5 dummy bits (sclk10 - sclk16) the next 7 sclk cycles are used as dummy bits. seven bits were chosen so that the serial interface can easily be divided into three 8-bit words to be compliant with standard serial interface devices. the state of these bits are ignored and can hold either ?0? or ?1? during both read and write operations. 5.1.6 data[7:0] (sclk17 - sclk24) the next 8 sclk cycles are used to provide the data to be written into the internal register chosen by the address bits. data[0] (lsb) must be sent to the liu first followed by data[1] and so forth until all 8 data bits have been sampled by sclk. once 24 sclk cycles have been completed, the liu holds the data until cs is pulled ?high? whereby, the serial microprocessor latches the data into the selected internal register. 5.1.7 8-bit serial data output description the serial data output is updated on the falling edge of sclk17 - sclk24 if r/w is set to ?1?. data[0] (lsb) is provided on sclk17 to the sdo pin first followed by data[1] and so forth until all 8 data bits have been updated. the sdo pin allows the user to read the contents stored in individual registers by providing the desired address on the sdi pin during the read cycle.
xrt83vsh28 preliminary 41 8-channel e1 short-haul line interface unit rev. p1.0.0 f igure 31. t iming d iagram for the m icroprocessor s erial i nterface t able 9: m icroprocessor s erial i nterface t imings ( t a = 25 0 c, v dd =3.3v 5% and load = 10 p f) s ymbol p arameter m in . t yp . m ax u nits t 21 cs low to rising edge of sclk 5 ns t 22 sdi to rising edge of sclk 5 ns t 23 sdi to rising edge of sclk hold time 5 ns t 24 sclk "low" time 20 ns t 25 sclk "high" time 20 ns t 26 sclk period 40 ns t 28 cs inactive time 40 ns t 29 falling edge of sclk to sdo valid time 5 ns t 31 rising edge of cs to high z 5 ns sdi addr 6 r/w addr 7 cs sclk cs sclk sdi sdo d0 d1 d2 d7 t 21 t 22 t 23 t 24 t 25 t 26 t 28 t 29 t 31 don?t care (read mode) hi-z
preliminary xrt83vsh28 42 rev. p1.0.0 8-channel e1 short-haul line interface unit 5.2 parallel microprocessor interface block the parallel microprocessor interface section supports communication between the local microprocessor (p) and the liu. the xrt83vsh28 supports an intel asynchronous interface, motorola 68k asynchronous, and an intel/motorola interface. the microprocessor interface is selected by the state of the pts[1:0] input pins. selecting the microprocessor interface is shown in table 10 . the xrt83vsh28 uses multipurpose pins to configure the device appropriately. the local p configures the liu by writing data into specific addressable, on-chip read/write registers. the microprocessor interface provides the signals which are required for a general purpose microprocessor to read or write data into these registers. the microprocessor interface also supports polled and interrupt driven environments. a simplified block diagram of the microprocessor is shown in figure 32 . t able 10: s electing the m icroprocessor i nterface m ode pts[1:0] m icroprocessor m ode 0h (00) intel 68hc11, 8051, 80c188 (asynchronous) 1h (01) motorola 68k (asynchronous) 3h (11) mpc8xx power pc (synchronous) f igure 32. s implified b lock d iagram of the m icroprocessor i nterface b lock microprocessor interface wr_r/w rd_ds ale ptype [1:0] rdy reset pclk cs int addr[7:0] data[7:0]
xrt83vsh28 preliminary 43 8-channel e1 short-haul line interface unit rev. p1.0.0 5.3 the microprocessor interface block signals the liu may be configured into different operating modes and have its performance monitored by software through a standard microprocessor using data, address and control signals. these interface signals are described below in table 11 , table 12 , and table 13 . the microprocessor interface can be configured to operate in intel mode or motorola mode. when the microprocessor interface is operating in intel mode, some of the control signals function in a manner required by the intel 80xx family of microprocessors. likewise, when the microprocessor interface is operating in motorola mode, then these control signals function in a manner as required by the motorola microprocessors. (for using a motorola 68k asynchronous processor, see figure 34 and table 15 ) table 11 lists and describes those microprocessor interface signals whose role is constant across the two modes. table 12 describes the role of some of these signals when the microprocessor interface is operating in the intel mode. likewise, table 13 describes the role of these signals when the microprocessor interface is operating in the motorola power pc mode. t able 11: xrt83vsh28 m icroprocessor i nterface s ignals that exhibit constant roles in both i ntel and m otorola m odes p in n ame t ype d escription pts[1:0] i microprocessor interface mode select input pins these three pins are used to specify the microprocessor interface mode. the relationship between the state of these three input pins, and the corresponding microprocessor mode is presented in table 10 . data[7:0] i/o bi-directional data bus for register "read" or "write" operations. addr[7:0] i eight-bit address bus inputs the xrt83vsh28 liu microprocessor interface uses a direct address bus. this address bus is provided to permit the user to select an on-chip register for read/write access. cs i chip select input this active low signal selects the microprocessor interface of the xrt83vsh28 liu and enables read/write operations with the on-chip register locations. t able 12: i ntel mode : m icroprocessor i nterface s ignals xrt83vsh28 p in n ame i ntel e quivalent p in t ype d escription ale ale i address-latch enable: this active high signal is used to latch the contents on the address bus addr[7:0]. the contents of the address bus are latched into the addr[7:0] inputs on the falling edge of ale. rd _ds rd i read signal: this active low input functions as the read signal from the local p. when this pin is pulled ?low? (if cs is ?low?) the liu is informed that a read oper - ation has been requested and begins the process of the read cycle. wr _r/ w wr i write signal: this active low input functions as the write signal from the local p. when this pin is pulled ?low? (if cs is ?low?) the liu is informed that a write operation has been requested and begins the process of the write cycle. rdy rdy o ready output: this active low signal is provided by the liu device. it indicates that the current read or write cycle is complete, and the liu is waiting for the next command.
preliminary xrt83vsh28 44 rev. p1.0.0 8-channel e1 short-haul line interface unit t able 13: m otorola m ode : m icroprocessor i nterface s ignals xrt83vsh28 p in n ame m otorola e quivalent p in t ype d escription ale as i address strobe: this active high signal is used to latch the contents on the address bus addr[7:0]. the contents of the address bus are latched into the addr[7:0] inputs on the falling edge of ts. wr _r/ w r/ w i read/ write : this input pin from the local p is used to inform the liu whether a read or write operation has been requested. when this pin is pulled ?high?, ds will initiate a read operation. when this pin is pulled ?low?, ds will initiate a write operation. rd _ds ds i data strobe: this active low input functions as the read or write signal from the local p dependent on the state of r/ w . when ds is pulled ?low? (if cs is ?low?) the liu begins the read or write operation. rdy dtack o data transfer acknowledge: this active low signal is provided by the liu device. it indicates that the current read or write cycle is complete, and the liu is waiting for the next command.
xrt83vsh28 preliminary 45 8-channel e1 short-haul line interface unit rev. p1.0.0 5.4 intel mode programmed i/o access (asynchronous) if the liu is interfaced to an intel type p, then it should be configured to operate in the intel mode. intel type read and write operations are described below. intel mode read cycle whenever an intel-type p wishes to read the contents of a register, it should do the following. 1. place the address of the target register on the address bus input pins addr[7:0]. 2. while the p is placing this address value on the address bus, the address decoding circuitry should assert the cs pin of the liu, by toggling it "low". this action enables further communication between the p and the liu microprocessor interface block. 3. toggle the ale input pin "high". this step enables the address bus input drivers, within the microproces - sor interface block of the liu. 4. the p should then toggle the ale pin "low". this step causes the liu to latch the contents of the address bus into its internal circuitry. at this point, the address of the register has now been selected. 5. next, the p should indicate that this current bus cycle is a read operation by toggling the rd input pin "low". this action also enables the bi-directional data bus output drivers of the liu. 6. after the p toggles the read signal "low", the liu will toggle the rdy output pin "low". the liu does this in order to inform the p that the data is available to be read by the p, and that it is ready for the next com - mand. 7. after the p detects the rdy signal and has read the data, it can terminate the read cycle by toggling the rd input pin "high". n ote : ale can be tied ?high? if this signal is not available. the intel mode write cycle whenever an intel type p wishes to write a byte or word of data into a register within the liu, it should do the following. 1. place the address of the target register on the address bus input pins addr[7:0]. 2. while the p is placing this address value on the address bus, the address decoding circuitry should assert the cs pin of the liu, by toggling it "low". this action enables further communication between the p and the liu microprocessor interface block. 3. toggle the ale input pin "high". this step enables the address bus input drivers, within the microproces - sor interface block of the liu. 4. the p should then toggle the ale pin "low". this step causes the liu to latch the contents of the address bus into its internal circuitry. at this point, the address of the register has now been selected. 5. the p should then place the byte or word that it intends to write into the target register, on the bi-direc - tional data bus data[7:0]. 6. next, the p should indicate that this current bus cycle is a write operation by toggling the wr input pin "low". this action also enables the bi-directional data bus input drivers of the liu. 7. after the p toggles the write signal "low", the liu will toggle the rdy output pin "low". the liu does this in order to inform the p that the data has been written into the internal register location, and that it is ready for the next command. n ote : ale can be tied ?high? if this signal is not available. the intel read and write timing diagram is shown in figure 33 . the timing specifications are shown in table 14 .
preliminary xrt83vsh28 46 rev. p1.0.0 8-channel e1 short-haul line interface unit f igure 33. i ntel p i nterface s ignals d uring p rogrammed i/o r ead and w rite o perations t able 14: i ntel m icroprocessor i nterface t iming s pecifications s ymbol p arameter m in m ax u nits t 0 valid address to cs falling edge 0 - ns t 1 cs falling edge to rd assert 65 - ns t 2 rd assert to rdy assert - 90 ns na rd pulse width (t 2 ) 90 - ns t 3 cs falling edge to wr assert 65 - ns t 4 wr assert to rdy assert - 90 ns na wr pulse width (t 4 ) 90 - ns cs addr[10:0] ale = 1 data[7:0] rd wr rdy valid data for readback data available to write into the liu read operation write operation t 0 t 0 t 1 t 4 t 2 t 3 valid address valid address
xrt83vsh28 preliminary 47 8-channel e1 short-haul line interface unit rev. p1.0.0 5.5 motorola mode programme d i/o access (asynchronous) if the liu is interfaced to a motorola type p, it should be configured to operate in the motorola mode. motorola type programmed i/o read and write operations are described below. motorola mode read cycle whenever a motorola type p wishes to read the contents of a register, it should do the following. 1. place the address of the target register on the address bus input pins addr[7:0]. 2. while the p is placing this address value on the address bus, the address decoding circuitry should assert the cs pin of the liu, by toggling it "low". this action enables further communication between the p and the liu microprocessor interface block. 3. the p should then toggle the as pin "low". this step causes the liu to latch the contents of the address bus into its internal circuitry. at this point, the address of the register has now been selected. 4. next, the p should indicate that this current bus cycle is a read operation by pulling the r/ w input pin "high". 5. toggle the ds input pin "low". this action enables the bi-directional data bus output drivers of the liu. 6. after the p toggles the ds signal "low", the liu will toggle the dtack output pin "low". the liu does this in order to inform the p that the data is available to be read by the p, and that it is ready for the next command. 7. after the p detects the dtack signal and has read the data, it can terminate the read cycle by toggling the ds input pin "high". motorola mode write cycle whenever a motorola type p wishes to write a byte or word of data into a register within the liu, it should do the following. 1. place the address of the target register on the address bus input pins addr[7:0]. 2. while the p is placing this address value on the address bus, the address decoding circuitry should assert the cs pin of the liu, by toggling it "low". this action enables further communication between the p and the liu microprocessor interface block. 3. the p should then toggle the as pin "low". this step causes the liu to latch the contents of the address bus into its internal circuitry. at this point, the address of the register has now been selected. 4. next, the p should indicate that this current bus cycle is a write operation by pulling the r/ w input pin "low". 5. toggle the ds input pin "low". this action enables the bi-directional data bus output drivers of the liu. 6. after the p toggles the ds signal "low", the liu will toggle the dtack output pin "low". the liu does this in order to inform the p that the data has been written into the internal register location, and that it is ready for the next command. 7. after the p detects the dtack signal and has read the data, it can terminate the read cycle by toggling the ds input pin "high". the motorola read and write timing diagram is shown in figure 34 . the timing specifications are shown in table 15 .
preliminary xrt83vsh28 48 rev. p1.0.0 8-channel e1 short-haul line interface unit f igure 34. m otorola 68k p i nterface s ignals d uring p rogrammed i/o r ead and w rite o perations t able 15: m otorola 68k m icroprocessor i nterface t iming s pecifications s ymbol p arameter m in m ax u nits t 0 valid address to cs falling edge 0 - ns t 1 cs falling edge to ds (pin rd _ds) assert 65 - ns t 2 ds assert to dtack assert - 90 ns na ds pulse width (t 2 ) 90 - ns t 3 cs falling edge to as (pin ale) falling edge 0 - ns cs addr[7:0] as data[7:0] rd _ds wr _r/w rdy _dtack valid data for readback data available to write into the liu read operation write operation t 0 t 0 t 1 t 2 motorola asychronous mode valid address valid address t 3 t 3 t 1 t 2
xrt83vsh28 preliminary 49 8-channel e1 short-haul line interface unit rev. p1.0.0 t able 16: m icroprocessor r egister a ddress (addr[7:0]) r egister n umber a ddress (h ex ) f unction 0 - 15 0x00 - 0x0f channel 0 control registers 16 - 31 0x10 - 0x1f channel 1 control registers 32 - 47 0x20 - 0x2f channel 2 control registers 48 - 63 0x30 - 0x3f channel 3 control registers 64 - 79 0x40 - 0x4f channel 4 control registers 80 - 95 0x50 - 0x5f channel 5 control registers 96 - 111 0x60 - 0x6f channel 6 control registers 112 - 127 0x70 - 0x7f channel 7 control registers 128 - 142 0x80 - 0x8e global control registers applied to all 8 channels 192 0xc0 global control register applied to all 8 channels 143 - 253 0x8f - 0xfd r/w registers reserved for testing (except 0xc0h) 254 0xfe device "id" 255 0xff device "revision id" t able 17: m icroprocessor r egister c hannel d escription r eg addr t ype d7 d6 d5 d4 d3 d2 d1 d0 channel 0 control registers (0x00 - 0x0f) 0 0x00 r/w qrss/prbs prbs_rx/ tx rxon eqc4 eqc3 eqc2 eqc1 eqc0 1 0x01 r/w rxtsel txtsel tersel1 tersel0 jasel1 jasel0 jabw fifos 2 0x02 r/w invqrss txtest2 txtest1 txtest0 txon loop2 loop1 loop0 3 0x03 r/w reserved reserved codes rxres1 rxres0 insbpv insber reserved 4 0x04 r/w reserved dmoie flsie lcvi/ofe reserved aisdie rlosie qrpdie 5 0x05 ro reserved dmo fls lcv/of reserved ais rlos qrpd 6 0x06 rur reserved dmois flsis lcv/ofis reserved aisis rlosis qrpdis 7 0x07 ro reserved reserved reserved reserved reserved reserved reserved reserved 8 0x08 r/w reserved 1seg6 1seg5 1seg4 1seg3 1seg2 1seg1 1seg0 9 0x09 r/w reserved 2seg6 2seg5 2seg4 2seg3 2seg2 2seg1 2seg0 10 0x0a r/w reserved 3seg6 3seg5 3seg4 3seg3 3seg2 3seg1 3seg0 11 0x0b r/w reserved 4seg6 4seg5 4seg4 4seg3 4seg2 4seg1 4seg0 12 0x0c r/w reserved 5seg6 5seg5 5seg4 5seg3 5seg2 5seg1 5seg0 13 0x0d r/w reserved 6seg6 6seg5 6seg4 6seg3 6seg2 6seg1 6seg0 14 0x0e r/w reserved 7seg6 7seg5 7seg4 7seg3 7seg2 7seg1 7seg0 15 0x0f r/w reserved 8seg6 8seg5 8seg4 8seg3 8seg2 8seg1 8seg0
preliminary xrt83vsh28 50 rev. p1.0.0 8-channel e1 short-haul line interface unit channel (1 -7) control registers (0x10 - 0x7f) see channel 0 global control registers for all 8 channels 128 0x80 r/w sr/dr ataos rclke tclke datap reserved gie sreset 129 0x81 r/w ovflo/lcv reserved reserved reserved reserved rxmute exlos ict 130 0x82 r/w txoncntl tercntl reserved reserved reserved reserved reserved reserved 131 0x83 r/w reserved reserved reserved reserved sl1 sl0 reserved reserved 140 0x8c r/w reserved reserved reserved reserved lcvch3 lcvch2 lcvch1 lcvch0 141 0x8d r/w reserved reserved reserved allrst allupdate bytesel chupdate chrst 142 0x8e ro lcvcnt7 lcvcnt6 lcvcnt5 lcvcnt4 lcvcnt3 lcvcnt2 lcvcnt1 lcvcnt0 192 0xc0 r/w reserved reserved reserved reserved reserved reserved reserved e1arben r/w registers reserved for testing (0x8f - 0xfd) except 0xc0h 254 0xfe ro device "id" 255 0xff ro device "revision id" t able 17: m icroprocessor r egister c hannel d escription r eg addr t ype d7 d6 d5 d4 d3 d2 d1 d0
xrt83vsh28 preliminary 51 8-channel e1 short-haul line interface unit rev. p1.0.0 t able 18: m icroprocessor r egister 0 x 00 h b it d escription c hannel 0-7 (0 x 00 h -0 x 70 h ) b it n ame f unction register type default value (hw reset) d7 qrss/ prbs qrss/prbs select bits these bits are used to select between qrss and prbs. 1 = qrss 0 = prbs r/w 0 d6 prbs_rx/ tx prbs receive/transmit select: this bit is used to select where the output of the prbs generator is directed if prbs generation is enabled. 0 = normal operation - prbs generator is output on ttip and tring if prbs generation is enabled. 1 = prbs generator is output on rpos; rneg is internally grounded, if prbs generation is enabled. n ote : if prbs generation is disabled, user should set this bit to ?0? for normal operation. r/w 0 d5 rxon receiver on/off upon power up, the receiver is powered off. rxon is used to turn the receiver on or off if the hardware pin rxon is pulled "high". if the hardware pin is pulled "low", all receivers are turned off. 0 = receiver is powered off 1 = receiver is powered on r/w 0 d4 d3 d2 d1 d0 eqc4 eqc3 eqc2 eqc1 eqc0 cable length setting the equalizer control bits are shown in table 19 below. r/w 0 0 0 0 0 pbrs generator tx ttip trin g + - bit 6 = "0" pbrs generator rx rpos rne g + - bit 6 = "1"
preliminary xrt83vsh28 52 rev. p1.0.0 8-channel e1 short-haul line interface unit t able 19: c able length s etting eqc[4:0] e1 m ode /r eceive s ensitivity t ransmit lbo c able c oding 0x1ch e1 short haul/15db itu g.703 75 ? coax hdb3 0x1dh e1 short haul/15db itu g.703 120 ? tp hdb3 t able 20: m icroprocessor r egister 0 x 01 h b it d escription c hannel 0-7 (0 x 01 h -0 x 71 h ) b it n ame f unction register type default value (hw reset) d7 rxtsel receive termination select upon power up, the receiver is in "high" impedance. rxtsel is used to switch between the internal termination and "high" imped - ance. 0 = "high" impedance 1 = internal termination r/w 0 d6 txtsel transmit termination select upon power up, the transmitter is in "high" impedance. txtsel is used to switch between the internal termination and "high" imped - ance. 0 = "high" impedance 1 = internal termination r/w 0 d5 d4 tersel1 tersel0 receive line impedance select tersel[1:0] are used to select the line impedance for e1. r/w 1 0 d3 d2 jasel1 jasel0 jitter attenuator select jasel[1:0] are used to select the jitter attenuator in the transmit or receive path. by default, the jitter attenuator is disabled. r/w 0 tersel1 tersel0 0 1 1 0 1 1 0 0 line impedanc e 120 ? 75 ? reserved reserved jasel1 jasel0 0 1 1 0 1 1 0 0 disabled receive path receive path transmit path ja path
xrt83vsh28 preliminary 53 8-channel e1 short-haul line interface unit rev. p1.0.0 d1 jabw jitter bandwidth the jitter bandwidth is a global setting that is applied to both the receiver and transmitter jitter attenuator. 0 = 10hz 1 = 1.5hz r/w 0 d0 fifos fifo depth select the fifo depth select is used to configure the part for a 32-bit or 64-bit fifo (within the jitter attenuator blocks). the delay of the fifo is equal to ? the fifo depth. this is a global setting that is applied to both the receiver and transmitter fifo. 0 = 32-bit 1 = 64-bit r/w 0 t able 21: m icroprocessor r egister 0 x 02 h b it d escription c hannel 0-7 (0 x 02 h -0 x 72 h ) b it n ame f unction register type default value (hw reset) d7 invqrss qrss inversion invqrss is used to invert the transmit qrss pattern set by the txtest[2:0] bits. by default, invqrss is disabled and the qrss will be transmitted with normal polarity. 0 = disabled 1 = enabled r/w 0 d6 d5 d4 txtest2 txtest1 txtest0 test code pattern txtest[2:0] are used to select a diagnostic test pattern to the line (transmit outputs). 0xx = no pattern 100 = tx qrss 101 = tx taos 110 = reserved 111 = reserved r/w 0 0 0 t able 20: m icroprocessor r egister 0 x 01 h b it d escription c hannel 0-7 (0 x 01 h -0 x 71 h ) b it n ame f unction register type default value (hw reset)
preliminary xrt83vsh28 54 rev. p1.0.0 8-channel e1 short-haul line interface unit d3 txon transmit on/off upon power up, the transmitters are powered off. this bit is used to turn the transmitter for this channel on or off if the txon pin is pulled "high". if the txon pin is pulled "low", all 8 transmitters are powered off. 0 = transmitter is powered off 1 = transmitter is powered on r/w 0 d2 d1 d0 loop2 loop1 loop0 loopback diagnostic select loop[2:0] are used to select the loopback mode. 0xx = no loopback 100 = dual loopback 101 = analog loopback 110 = remote loopback 111 = digital loopback r/w 0 0 0 t able 22: m icroprocessor r egister 0 x 03 h b it d escription c hannel 0-7 (0 x 03 h -0 x 73 h ) b it n ame f unction register type default value (hw reset) d[7:6] reserved this register bit is not used. d5 codes encoding/decoding select (single rail mode only) 0 = hdb3 1 = ami coding r/w 0 d4 d3 rxres1 rxres0 receive external fixed resistor rxres[1:0] are used to select the value for a high precision exter - nal resistor to improve return loss. 00 = none 01 = 240 ? 10 = 210 ? 11 = 150 ? r/w 0 0 d2 insbpv insert bipolar violation when this bit transitions from a "0" to a "1", a bipolar violation will be inserted in the transmitted qrss/prbs pattern. the state of this bit will be sampled on the rising edge of tclk. to ensure proper operation, it is recommended to write a "0" to this bit before writing a "1". r/w 0 t able 21: m icroprocessor r egister 0 x 02 h b it d escription c hannel 0-7 (0 x 02 h -0 x 72 h ) b it n ame f unction register type default value (hw reset)
xrt83vsh28 preliminary 55 8-channel e1 short-haul line interface unit rev. p1.0.0 d1 insber insert bit error when this bit transitions from a "0" to a "1", a bit error will be inserted in the transmitted qrss/prbs pattern. the state of this bit will be sampled on the rising edge of tclk. to ensure proper operation, it is recommended to write a "0" to this bit before writing a "1". r/w 0 d0 reserved t able 23: m icroprocessor r egister 0 x 04 h b it d escription c hannel 0-7(0 x 04 h -0 x 74 h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used. d6 dmoie digital monitor output interrupt enable 0 = masks the dmo function 1 = enables interrupt generation r/w 0 d5 flsie fifo limit status interrupt enable 0 = masks the fls function 1 = enables interrupt generation r/w 0 d4 lcv/ofie line code violation / counter overflow interrupt enable 0 = masks the lcv/of function 1 = enables interrupt generation r/w 0 d3 reserved this register bit is not used. d2 aisie alarm indication signal interrupt enable 0 = masks the ais function 1 = enables interrupt generation r/w 0 d1 rlosie receiver loss of signal interrupt enable 0 = masks the rlos function 1 = enables interrupt generation r/w 0 d0 qrpdie quasi random signal source interrupt enable 0 = masks the qrpd function 1 = enables interrupt generation r/w 0 t able 22: m icroprocessor r egister 0 x 03 h b it d escription c hannel 0-7 (0 x 03 h -0 x 73 h ) b it n ame f unction register type default value (hw reset)
preliminary xrt83vsh28 56 rev. p1.0.0 8-channel e1 short-haul line interface unit n ote : the gie bit in the global register 0xe0h must be set to "1" in addition to the individual register bits to enable the interrupt pin. t able 24: m icroprocessor r egister 0 x 05 h b it d escription c hannel 0-7 (0 x 05 h -0 x 75 h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used. d6 dmo digital monitor output the digital monitor output is always active regardless if the inter - rupt generation is disabled. this bit indicates the dmo activity. an interrupt will not occur unless the dmoie is set to "1" in the chan - nel register 0x04h and gie is set to "1" in the global register 0xe0h. 0 = no alarm 1 = transmit output driver has failures ro 0 d5 fls fifo limit status the fifo limit status is always active regardless if the interrupt generation is disabled. this bit indicates whether the rd/wr pointers are within 3-bits. an interrupt will not occur unless the flsie is set to "1" in the channel register 0x04h and gie is set to "1" in the global register 0xe0h. 0 = no alarm 1 = rd/wr fifo pointers are within 3-bits ro 0 d4 lcv/of line code violation / counter overflow this bit serves a dual purpose. by default, this bit monitors the line code violation activity. however, if bit 7 in register 0x81h is set to a "1", this bit monitors the overflow status of the internal lcv counter. an interrupt will not occur unless the lcv/ofie is set to "1" in the channel register 0x04h and gie is set to "1" in the global register 0x80h. 0 = no alarm 1 = a line code violation, bipolar violation, or excessive zeros has occurred ro 0 d3 reserved this register bit is not used. d2 aisd alarm indication signal the alarm indication signal detection is always active regardless if the interrupt generation is disabled. this bit indicates the ais activity. an interrupt will not occur unless the aisie is set to "1" in the channel register 0x04h and gie is set to "1" in the global regis - ter 0xe0h. 0 = no alarm 1 = an all ones signal is detected ro 0
xrt83vsh28 preliminary 57 8-channel e1 short-haul line interface unit rev. p1.0.0 d1 rlos receiver loss of signal the receiver loss of signal detection is always active regardless if the interrupt generation is disabled. this bit indicates the rlos activity. an interrupt will not occur unless the rlosie is set to "1" in the channel register 0x04h and gie is set to "1" in the global register 0xe0h. 0 = no alarm 1 = an rlos condition is present ro 0 d0 qrpd quasi random pattern detection the quasi random pattern detection is always active regardless if the interrupt generation is disabled. this bit indicates that a qrpd has been detected. an interrupt will not occur unless the qrpdie is set to "1" in the channel register 0x04h and gie is set to "1" in the global register 0xe0h. 0 = no alarm 1 = a qrp is detected ro 0 t able 25: m icroprocessor r egister 0 x 06 h b it d escription c hannel 0-7 (0 x 06 h -0 x 76 h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used. d6 dmois digital monitor output status 0 = no change 1 = change in status occurred rur 0 d5 flsis fifo limit status 0 = no change 1 = change in status occurred rur 0 d4 lcv/ofis line code violation / overflow status 0 = no change 1 = change in status occurred rur 0 d3 reserved this register bit is not used. d2 aisdis alarm indication signal status 0 = no change 1 = change in status occurred rur 0 n ote : the gie bit in the global register 0xe0h must be set to "1" in addition to the individual register bits to enable the interrupt pin. t able 24: m icroprocessor r egister 0 x 05 h b it d escription c hannel 0-7 (0 x 05 h -0 x 75 h ) b it n ame f unction register type default value (hw reset)
preliminary xrt83vsh28 58 rev. p1.0.0 8-channel e1 short-haul line interface unit n ote : any change in status will generate an interrupt (if enabled in channel register 0x04h and gie is set to "1" in the global register 0x80h). the status registers are reset upon read (rur). d1 rlosis receiver loss of signal status 0 = no change 1 = change in status occurred rur 0 d0 qrpdis quasi random pattern detection status 0 = no change 1 = change in status occurred rur 0 t able 26: m icroprocessor r egister 0 x 08 h b it d escription c hannel 0-7 (0 x 08 h -0 x 78 h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used x 0 d6 d5 d4 d3 d2 d1 d0 1seg6 1seg5 1seg4 1seg3 1seg2 1seg1 1seg0 arbitrary pulse generation the transmit output pulse is divided into 8 individual segments. this register is used to program the first segment which corre - sponds to the overshoot of the pulse amplitude. there are four segments for the top portion of the pulse and four segments for the bottom portion of the pulse. segment number 5 corresponds to the undershoot of the pulse. the msb of each segment is the sign bit. bit 6 = 0 = negative direction bit 6 = 1 = positive direction r/w 0 0 0 0 0 0 0 t able 27: m icroprocessor r egister 0 x 09 h b it d escription c hannel 0-7 (0 x 09 h -0 x 79 h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used x 0 d[6:0] 2seg[6:0] segment number two, same description as register 0x08h r/w t able 25: m icroprocessor r egister 0 x 06 h b it d escription c hannel 0-7 (0 x 06 h -0 x 76 h ) b it n ame f unction register type default value (hw reset)
xrt83vsh28 preliminary 59 8-channel e1 short-haul line interface unit rev. p1.0.0 t able 28: m icroprocessor r egister 0 x 0a h b it d escription c hannel 0-7 (0 x 0a h -0 x 7a h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used x 0 d[6:0] 3seg[6:0] segment number three, same description as register 0x08h r/w t able 29: m icroprocessor r egister 0 x 0b h b it d escription c hannel 0-7 (0 x 0b h -0 x 7b h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used x 0 d[6:0] 4seg[6:0] segment number four, same description as register 0x08h r/w t able 30: m icroprocessor r egister 0 x 0c h b it d escription c hannel 0-7 (0 x 0c h -0 x 7c h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used x 0 d[6:0] 5seg[6:0] segment number five, same description as register 0x08h r/w t able 31: m icroprocessor r egister 0 x 0d h b it d escription c hannel 0-7 (0 x 0d h -0 x 7d h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used x 0 d[6:0] 6seg[6:0] segment number six, same description as register 0x08h r/w
preliminary xrt83vsh28 60 rev. p1.0.0 8-channel e1 short-haul line interface unit t able 32: m icroprocessor r egister 0 x 0e h b it d escription c hannel 0-7 (0 x 0e h -0 x 7e h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used x 0 d[6:0] 7seg[6:0] segment number seven, same description as register 0x08h r/w t able 33: m icroprocessor r egister 0 x 0f h b it d escription c hannel 0-7 (0 x 0f h -0 x 7f h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used x 0 d[6:0] 8seg[6:0] segment number eight, same description as register 0x08h r/w t able 34: m icroprocessor r egister 0 x 80 h , b it d escription r egister a ddress 0 x 80 h n ame f unction r egister t ype r eset v alue b it # d7 sr/ dr single-rail/dual-rail select: writing a ?1? to this bit configures all 4channels in the xrt83vsh28 to operate in the single-rail mode. writing a ?0? configures the xrt83vsh28 to operate in dual- rail mode. r/w 0 d6 ataos automatic transmit all ones upon rlos: writing a ?1? to this bit enables the automatic transmission of all "ones" data to the line for the channel that detects an rlos condition. writing a ?0? disables this feature. r/w 0 d5 rclke receive clock edge: writing a ?1? to this bit selects receive output data of all channels to be updated on the negative edge of rclk. wring a ?0? selects data to be updated on the positive edge of rclk. r/w 0 d4 tclke transmit clock edge: writing a ?0? to this bit selects transmit data at tpos_n/tdata_n and tneg_n/codes_n of all channels to be sampled on the falling edge of tclk_n. writing a ?1? selects the rising edge of the tclk_n for sam - pling. r/w 0
xrt83vsh28 preliminary 61 8-channel e1 short-haul line interface unit rev. p1.0.0 d3 datap data polarity: writing a ?0? to this bit selects transmit input and receive output data of all channels to be active ?high?. writing a ?1? selects an active ?low? state. r/w 0 d2 reserved 0 d1 gie global interrupt enable: writing a ?1? to this bit globally enables interrupt generation for all channels. writing a ?0? disables interrupt generation. r/w 0 d0 sreset software reset p registers: writing a ?1? to this bit longer than 10s initiates a device reset through the microprocessor interface. all internal circuits are placed in the reset state with this bit set to a ?1? except the microprocessor register bits. r/w 0 t able 34: m icroprocessor r egister 0 x 80 h , b it d escription
preliminary xrt83vsh28 62 rev. p1.0.0 8-channel e1 short-haul line interface unit t able 35: m icroprocessor r egister 0 x 81 h , b it d escription r egister a ddress 0 x 81 h n ame f unction r egister t ype r eset v alue b it # d7 reserved r/w 0 d6 reserved r/w 0 d5 reserved r/w 0 d4 reserved r/w 0 d3 reserved r/w 0 d2 rxmute receive output mute: writing a ?1? to this bit, mutes receive outputs at rpos/rdata and rneg/lcv pins to a ?0? state for any channel that detects an rlos condition. n ote : rclk is not muted. r/w 0 d1 exlos extended los: writing a ?1? to this bit extends the number of zeros at the receive input of each channel before rlos is declared to 4096 bits. writing a ?0? reverts to the normal mode (32 bits for e1). r/w 0 d0 ict in-circuit-testing: writing a ?1? to this bit configures all the output pins of the chip in high impedance mode for in-circuit- testing. setting the ict bit to ?1? is equivalent to connecting the hardware ict pin 88 to ground. r/w 0 t able 36: m icroprocessor r egister 0 x 82 h b it d escription g lobal r egister (0 x 82 h ) b it n ame f unction register type default value (hw reset) d7 txoncntl transmit on control 0 = control of transmitter is set ; if hardware mode, by txon pin if host mode, by txon bit 1 = control of transmitter on, is determined by the individual chan - nel txon bits r/w 0 d6 tercntl receive termination select control this bit sets the liu to control the rxtsel function with either the individual channel register bit or the global hardware pin. 0 = control of the receive termination is set to the register bits 1 = control of the receive termination is set to the rxtsel hard - ware pin r/w 0 d[5:0] reserved these register bits are not used r/w 0
xrt83vsh28 preliminary 63 8-channel e1 short-haul line interface unit rev. p1.0.0 t able 37: m icroprocessor r egister 0 x 83 h b it d escription g lobal r egister (0 x 83 h ) b it n ame f unction register type default value (hw reset) d{7:4] reserved r/w 0 d[3:2] sl[1:0] slicer level select 00 = 60% 01 = 65% 10 = 70% 11 = 55% r/w 00 d[1:0] reserved these register bits are not used r/w 0
preliminary xrt83vsh28 64 rev. p1.0.0 8-channel e1 short-haul line interface unit t able 38: m icroprocessor r egister 0 x 8c h b it d escription g lobal r egister (0 x 8c h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used r/w 0 d6 reserved this register bit is not used r/w 0 d5 reserved this register bit is not used r/w 0 d4 reserved this register bit is not used r/w 0 d3 d2 d1 d0 lcvch3 lcvch2 lcvch1 lcvch0 line code violation counter select these bits are used to select which channel is to be addressed for reading the contents in register 0x8eh. it is also used to address the counter for a given channel when performing an update or reset on a per channel basis. by default, channel 0 is selected. 0000 = none 0001 = channel 0 0010 = channel 1 0011 = channel 2 0100 = channel 3 0100 = channel 4 0100 = channel 5 0100 = channel 6 0100 = channel 7 r/w 0 0 0 0 t able 39: m icroprocessor r egister 0 x 8d h b it d escription g lobal r egister (0 x 8d h ) b it n ame f unction register type default value (hw reset) d7 reserved this register bit is not used r/w 0 d6 reserved this register bit is not used r/w 0 d5 reserved this register bit is not used r/w 0 d4 allrst lcv counter reset for all channels this bit is used to reset all internal lcv counters to their default state 0000h. this bit must be set to "1" for 1 s. 0 = normal operation 1 = resets all counters r/w 0 d3 allupdate lcv counter update for all channels this bit is used to latch the contents of all counters into holding registers so that the value of each counter can be read. the chan - nel is addressed by using bits d[3:0] in register 0x8ch. 0 = normal operation 1 = updates all counters r/w 0
xrt83vsh28 preliminary 65 8-channel e1 short-haul line interface unit rev. p1.0.0 d2 bytesel lcv counter byte select this bit is used to select the msb or lsb for reading the contents of the lcv counter for a given channel. the channel is addressed by using bits d[3:0] in register 0x8ch. by default, the lsb byte is selected. 0 = low byte 1 = high byte r/w 0 d1 chupdate lcv counter update per channel this bit is used to latch the contents of the counter for a given channel into a holding register so that the value of the counter can be read. the channel is addressed by using bits d[3:0] in register 0x8ch. 0 = normal operation 1 = updates the selected channel r/w 0 d0 chreset lcv counter reset per channel this bit is used to reset the lcv counter of a given channel to its default state 0000h. the channel is addressed by using bits d[3:0] in register 0x8ch. this bit must be set to "1" for 1 s. 0 = normal operation 1 = resets the selected channel r/w 0 t able 40: m icroprocessor r egister 0 x 8e h b it d escription g lobal r egister (0 x 8e h ) b it n ame f unction register type default value (hw reset) d7 d6 d5 d4 d3 d2 d1 d0 lcvcnt7 lcvcnt6 lcvcnt5 lcvcnt4 lcvcnt3 lcvcnt2 lcvcnt1 lcvcnt0 line code violation byte contents these bits contain the lcv counter contents of the byte selected by bit d2 in register 0x8dh for a given channel. the channel is addressed by using bits d[3:0] in register 0x8ch. by default, the contents contain the lsb, however no channel is selected.. r/w 0 0 0 0 0 0 0 0 t able 39: m icroprocessor r egister 0 x 8d h b it d escription g lobal r egister (0 x 8d h ) b it n ame f unction register type default value (hw reset)
preliminary xrt83vsh28 66 rev. p1.0.0 8-channel e1 short-haul line interface unit t able 41: m icroprocessor r egister 0 x c0 h b it d escription g lobal r egister (0 x c0 h ) b it n ame f unction register type default value (hw reset) d[7:1] reserved these register bits are not used. r/w 0 d0 e1arben e1 arbitrary pulse enable this bit is used to enable the arbitrary pulse generators for shap - ing the transmit pulse shape when e1 mode is selected. if this bit is set to "1", all 8 channels will be configured for the arbitrary mode. however, each channel is individually controlled by pro - gramming the channel registers 0xn8 through 0xnf, where n is the number of the channel. "0" = disabled (normal e1 pulse shape itu g.703) "1" = arbitrary pulse enabled r/w 0 t able 42: m icroprocessor r egister 0 x fe h b it d escription d evice "id" r egister (0 x fe h ) b it n ame f unction register type default value (hw reset) d7 d6 d5 d4 d3 d2 d1 d0 device "id" the device "id" of the xrt83vsh28 short haul liu is 0xe9h. along with the revision "id", the device "id" is used to enable soft - ware to identify the silicon adding flexibility for system control and debug. ro 1 1 1 0 1 0 0 1 t able 43: m icroprocessor r egister 0 x ff h b it d escription r evision "id" r egister (0 x ff h ) b it n ame f unction register type default value (hw reset) d7 d6 d5 d4 d3 d2 d1 d0 revision "id" the revision "id" of the xrt83vsh28 liu is used to enable soft - ware to identify which revision of silicon is currently being tested. the revision "id" for the first revision of silicon will be 0x01h. ro 0 0 0 0 0 0 0 1
xrt83vsh28 preliminary 67 8-channel e1 short-haul line interface unit rev. p1.0.0 6.0 electrical characteristics n ote : input leakage current excludes pins that are internally pulled "low" or "high" t able 44: a bsolute m aximum r atings storage temperature -65c to +150c operating temperature -40c to +85c supply voltage -0.5v to +3.8v vin -0.5v to +5.5v t able 45: dc d igital i nput and o utput e lectrical c haracteristics vdd=3.3v 5%, t a =25c, u nless o therwise s pecified p arameter s ymbol m in t yp m ax u nits power supply voltage vdd 3.13 3.3 3.46 v input high voltage v ih 2.0 - 5.0 v input low voltage v il -0.5 - 0.8 v output high voltage ioh=2.0ma v oh 2.4 - v output low voltage iol=2.0ma v ol - - 0.4 v input leakage current i l - - 10 a input capacitance c i - 5.0 pf output lead capacitance c l - - 25 pf t able 46: ac e lectrical c haracteristics vdd=3.3v 5%, t a =25c, u nless o therwise s pecified p arameter s ymbol m in t yp m ax u nits mclkin clock duty cycle 40 - 60 % mclkin clock tolerance - 50 - ppm
preliminary xrt83vsh28 68 rev. p1.0.0 8-channel e1 short-haul line interface unit t able 47: p ower c onsumption vdd=3.3v 5%, t a =25c, u nless o therwise s pecified m ode s upply v oltage i mpedance r eceiver t ransmitter t yp m ax u nit t est c ondition e1 3.3v 75 ? 1:1 1:2 1.188 0.891 - w 100% ones 50% ones e1 3.3v 120 ? 1:1 1:2 1.056 0.825 - w 100% ones 50% ones n ote : the typical power consumption of the 1.8v supply represents ~ 36mw of the above listed. t able 48: e1 r eceiver e lectrical c haracteristics (v dd =3.3v5%, t a =25c unless otherwise specified ) p arameter m in t yp . m ax u nit t est c onditions receiver loss of signal: number of consecutive zeros before los is set - 32 - bit cable attenuation @1024khz itu-g.775, ets1 300 233 input signal level at los 13 16 - db rlos clear 12.5 - - % ones receiver sensitivity 9 - - db with nominal pulse amplitude of 3.0v for 120 ? and 2.37v for 75 ? application. interference margin -18 -14 - db with 6db cable loss input impedance 15 - k ? jitter tolerance: 1 hz 10khz---100khz 37 0.3 - - - - uipp uipp itu g.823 recovered clock jitter transfer corner frequency peaking amplitude - 20 36 0.5 khz db itu g.736 jitter attenuator corner frequency(-3db curve) jabw=0 jsbw=1 - - 10 1.5 - - hz hz itu g.736 return loss: 51khz --- 102khz 102khz --- 2048khz 2048khz --- 3072khz 12 8 8 - - - - - - db db db itu g.703
xrt83vsh28 preliminary 69 8-channel e1 short-haul line interface unit rev. p1.0.0 t able 49: e1 t ransmitter e lectrical c haracteristics vdd=3.3v 5%, t a =25c, u nless o therwise s pecified p arameter m in t yp m ax u nit t est c ondition ami output pulse amplitude 75 ? 120 ? 2.13 2.70 2.37 3.00 2.60 3.30 v v 1:2 transformer output pulse width 224 244 264 ns output pulse width ratio 0.95 - 1.05 itu-g.703 output pulse amplitude ratio 0.95 - 1.05 itu-g.703 jitter added by the transmitter output - 0.025 0.05 ui p-p broad band with jitter free tclk applied to the input. output return loss 51khz - 102khz 102khz - 2048khz 2048khz - 3072khz 15 9 8 - - - - - - db db db etsi 300 166
preliminary xrt83vsh28 70 rev. p1.0.0 8-channel e1 short-haul line interface unit package dimensions 225 ball plastic ball grid array (bottom view) (19.0 x 19.0 x 1.0mm) 1 2 4 3 7 86 5 17 16 14 15 12 13 11 10 9 18 a b c d e f g h j k l m n p r t u v d d1 d d1 a1 feature / mar k d2 a a1 a2 a3 e b (a1 corner feature is mfger option) seating plane symbol min max min max a 0.049 0.096 1.24 2.45 a1 0.016 0.024 0.40 0.60 a2 0.013 0.024 0.32 0.60 a3 0.020 0.048 0.52 1.22 d 0.740 0.756 18.80 19.20 d1 0.669 bsc 17.00 bsc d2 0.665 0.669 16.90 17.00 b 0.020 0.028 0.50 0.70 e 0.039 bsc 1.00 bsc inches millimeters note: the control dimension is in millimeter.
71 notice exar corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. exar corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. charts and schedules contained here in are only for illustration purposes and may vary depending upon a user?s specific application. while the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. products are not authorized for use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of exar corporation is adequately protected under the circumstances. copyright 2006 exar corporation datasheet august 2006. reproduction, in part or whole, without the prior written consent of exar corporation is prohibited. xrt83vsh28 preliminary 8-channel e1 short-haul line interface unit rev. p1.0.0 ordering information revisions p art n umber p ackage o perating t emperature r ange XRT83VSH28IB 225 ball bga -40 c to +85 c r evision # d ate d escription p1.0.0 10/18/06 preliminary release of the 8-channel e1 liu datasheet

▲Up To Search▲

Price & Availability of XRT83VSH28IB

	To Download XRT83VSH28IB Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .