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preliminary product information this document contains information for a new product. cirrus logic reserves the right to modify this product without notice. 1 copyright ? cirrus logic, inc. 2000 (all rights reserved) p.o. box 17847, austin, texas 78760 (512) 445 7222 fax: (512) 445 7581 http://www.cirrus.com CS61881 octal e1 analog front end features octal e1 line interface unit compliant with g.703 very low power <100mw per channel single supply 3.3 v operation, 5 v tolerant i/o no external component changes for 120 ? /75 ? operation analog los detection per itu g.775 transmitter short circuit current limiter (<50ma) tx drivers with fast tristate and power down transmit return loss exceeds ets 300 166 jtag boundary scan compliant to ieee 1149.1 144 pin lqfp or 160 bga package ordering information CS61881-iq 144-pin lqfp CS61881-ib 160-pin bga description the CS61881contains eight analog front ends that each provide the line interface for e1 transmission systems. the device contains eight receivers and transmitters supporting a 2.048 mbps data rate compliant to itu g.703. this device is commonly used with external cir- cuitry that supplies data encoding/decoding, clock recovery, and jitter attenuation. the CS61881 makes use of ultra low power matched im- pedance transmitters to reduce power beyond that achieved by traditional driver designs. by achieving a more precise line match, this technique also provides su- perior return loss characteristics, exceeding ets 300 166. the internal line matching circuitry reduces the ex- ternal component count and eliminates the need to change components to support both 75 ? and 120 ? lines. all transmitters have controls for independent pow- er down and tristate. the receiver has a high noise margin, providing reliable data recovery even with cable attenuation of over 12 db. it has an impedance matched front end, eliminating the need to change components to support both 75 ? and 120 ? line impedances. the receiver also incorporates los detection compliant to the most recent specifications. a five wire jtag interface is also provided for improved diagnostics and reduced manufacturing cost. driver peak detect rpos rneg tpos tneg tclk los slicer g.775 los pulse shaper 1 2 8 rtip rring ttip tring local loopback xor rclk remote loopback jtag serial port jtag interface apr ?00 ds451pp3
CS61881 2 ds451pp3 table of contents 1. characteristics and specifications ........................................................................ 4 absolute maximum ratings ........................................................................................... 4 recommended operating conditions ....................................................................... 4 digital characteristics ................................................................................................. 5 analog specifications .................................................................................................... 6 switching characteristics .......................................................................................... 7 2. theory of operation ....................................................................................................... 9 2.1 transmitter ............................................................................................................... .......... 9 2.2 receiver .................................................................................................................. ........... 9 2.3 loss-of-signal detector ................................................................................................... 10 2.4 loopback .................................................................................................................. ....... 10 2.4.1 local loopback ................................................................................................... 10 2.4.2 remote loopback ............................................................................................... 10 2.5 5v logic support .......................................................................................................... ... 10 2.6 jtag support .............................................................................................................. .... 10 2.6.1 tap controller ..................................................................................................... 10 2.6.2 test-logic-reset ................................................................................................. 12 2.6.3 run-test-idle ...................................................................................................... 12 2.6.4 select-dr-scan .................................................................................................. 12 2.6.5 capture-dr ......................................................................................................... 12 2.6.6 shift-dr ............................................................................................................... 1 2 2.6.7 exit1-dr .............................................................................................................. 12 2.6.8 pause-dr ............................................................................................................ 12 2.6.9 exit2-dr .............................................................................................................. 12 2.6.10 update-dr ........................................................................................................ 12 2.6.11 select-ir-scan .................................................................................................. 12 2.6.12 capture-ir ......................................................................................................... 12 2.6.13 shift-ir .............................................................................................................. 1 2 2.6.14 exit1-ir ............................................................................................................. 12 2.6.15 pause-ir ........................................................................................................... 12 2.6.16 exit2-ir ............................................................................................................. 12 2.6.17 update-ir .......................................................................................................... 12 2.7 jtag instruction register (ir) ......................................................................................... 13 2.7.1 extest .............................................................................................................. 13 2.7.2 sample/preload ........................................................................................... 13 2.7.3 idcode .............................................................................................................. 13 2.7.4 bypass .............................................................................................................. 13 2.8 boundary scan register (bsr) ....................................................................................... 13 contacting cirrus logic support for a complete listing of direct sales, distributor, and sales representative contacts, visit the cirrus logic web site at: http://www.cirrus.com/corporate/contacts/ preliminary product information describes products which are in production, but for which full characterization data is not yet available. advance product infor- mation describes products which are in development and subject to development changes. cirrus logic, inc. has made best effort s to ensure that the information contained in this document is accurate and reliable. however, the information is subject to change without notice and is provi ded ?as is? without warranty of any kind (express or implied). no responsibility is assumed by cirrus logic, inc. for the use of this information, nor for inf ringements of patents or other rights of third parties. this document is the property of cirrus logic, inc. and implies no license under patents, copyrights, tradem arks, or trade secrets. no part of this 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CS61881 ds451pp3 3 3. pin description ........................................................................................................... ...... 15 3.1 pinout - 144-pin lqfp .................................................................................................... 1 5 3.2 pinout - 160-pin fbga .................................................................................................... 1 6 3.3 pin descriptions .......................................................................................................... ..... 17 4. package dimensions ..................................................................................................... 24 5. applications ....................................................................................................... ....... 26 list of figures figure 1. signal rise and fall characteristics .............................................................................. 8 figure 2. recovered clock and data switching characteristics ................................................... 8 figure 3. transmit clock and data switching characteristics ...................................................... 8 figure 4. mask of the pulse at the 2048 kbps interface ................................................................ 9 figure 5. test access port architecture ...................................................................................... 11 figure 6. tap controller state diagram ..................................................................................... 11 figure 7. 144-pin lqfp pin description drawing ....................................................................... 15 figure 8. 160-pin fbga pin description drawing ...................................................................... 16 figure 9. internal rx impedance matching ................................................................................. 26 figure 10. external rx impedance matching ............................................................................. 27 list of tables table 1. jtag instructions..................................................................................................... ....... 13 table 2. boundary scan register ................................................................................................ .14
CS61881 4 ds451pp3 1. characteristics and specifications absolute maximum ratings warning: operations at or beyond these limits may result in permanent damage to the device. normal operation is not guaranteed at these extremes 1. transient currents of up to 100 ma will not cause scr latch-up. also ttip, tring, tvcc and tgnd can withstand a continuous current of 100 ma. recommended operating conditions notes: 2. tvcc must not exceed rvcc by more than 0.3 v. 3. power consumption while driving line load over operating temperature range. includes ic and load. digital input levels are within 10% of the supply rails and digital outputs are driving a 50 pf capacitive load. 4. typical consumption corresponds to 50% ones density and medium line length at 3.3v. 5. maximum consumption corresponds to 100% ones density and maximum line length at 3.465v. parameter symbol min max units dc supply (referenced to rgnd=tgnd=0 v) rvcc tvcc - - 4.0 (rvcc) + 0.3 v v dc supply vccio -0.5 4.6 v input voltage, any digital pin v in gndio-0.5 5.8 v input voltage, any three level pin (loopn, cblsel) v in gndio-0.5 vccio+0.5 v input voltage, rtip & rring v in rgnd-0.5 (rvcc)+ 0.5 v input current, any pin (note 1) i in -10 10 a ambient operating temperature t a -40 85 c storage temperature t stg -65 150 c parameter symbol min typ max units dc supply (note 2) rvcc, tvcc 3.135 3.3 3.465 v dc supply vccio 3.135 3.3 3.465 v ambient operating temperature t a -40 25 85 c power consumption, 75 ? mode (notes 3,4,5) p c -tbd112mw power consumption, 120 ? mode (notes 3,4,5) p c -tbd99mw
CS61881 ds451pp3 5 digital characteristics (ta = -40 c to 85 c; tvcc, rvcc = 3.3 v 5%; gnd = 0 v) notes: 6. this specification guarantees ttl compatibility (v oh = 2.4 v @ i out = -400 a). 7. output drivers are ttl compatible. parameter symbol min typ max units high-level input voltage, any digital pin (note 6) v ih 2.0 - - v low-level input voltage, any digital pin (note 6) v il --0.8v low-level input voltage, any three level pin (loopn, cblsel) (note 6) v ihl - - 1/3 vccio-0.2 v mid-level input voltage, any three level pin (loopn, cblsel) (note 6) v ihm 1/3 vccio+0.2 0.5vccio 2/3 vccio-0.2 v high-level input voltage, any three level pin (loopn, cblsel) (note 6) v ihh 2/3 vccio+0.2 - - v high-level output voltage (notes 6, 7) i out = -400 a v oh 2.4 - - v low-level output voltage (notes 6, 7) i out = 1.6 ma v ol --0.4v input leakage current - - 10 a
CS61881 6 ds451pp3 analog specifications (ta = -40 c to 85 c; tvcc, rvcc = 3.3v 5%; gnd = 0 v) notes: 8. pulse amplitude measured at the output of the transformer across a 75 ? load. 9. pulse amplitude measured at the output of the transformer across a 120 ? load. 10. assuming that jitter free clock is input to tclk. 11. not production tested. parameters guaranteed by design and characterization. 12. using components in cdb61881 evaluation board parameter min typ max units transmitter output pulse amplitudes 75 ? (note 8) 120 ? (note 9) 2.14 2.7 2.37 3.0 2.6 3.3 v v positive to negative pulse imbalance (notes 8, 9, 11) amplitude at center of pulse width at 50% of nominal amplitude -5 -5 - - 5 5 % % transmit return loss - 75 ? coaxial (note 11,12) 51khz to 102khz 102khz to 2048khz 2048khz to 3072khz 17 17 17 - - - - - - db transmit return loss - 120 ? twisted pair (note 11,12) 51khz to 102khz 102khz to 2048khz 2048khz to 3072khz 17 17 17 - - - - - - db transmitter short circuit current (notes 11) - - 50 ma rms transmit intrinsic jitter; 20hz to 100khz (notes 10,11) - tbd tbd ui receiver rtip/rring input impedance 120 ? load, cblsel open 75 ? load, cblsel high or low - 40k 40k - ? receiver dynamic range 0.5 - - vp signal to noise margin (per g.703, o.151 @ 6db cable atten.) 18 - - db receiver squelch level 150 mv los threshold - 200 - mv los hysteresis 50 mv data decision threshold 43 50 57 % of peak input return loss (notes 11, 12) 20khz to 51khz 51 khz - 102 khz 102khz - 2048khz 2048 khz - 3072 khz 20 20 20 14 - - - - - - - - db db db db los occurrence to alos asserted delay 30 s los reset 10 - 255 marks
CS61881 ds451pp3 7 switching characteristics (ta = -40 c to 85 c; tvcc, rvcc = 3.3 v 5%; gnd = 0 v; inputs: logic 0 = 0 v, logic 1 = rvcc; see figures 1, 2, & 3) notes: 13. output load capacitance = 50 pf. parameter symbol min typ max units tclk frequency 2.048 mhz transmit pulse width (nrz mode) 219 244 269 ns tclk duty cycle (nrz mode) t tch /t tcpw 10 - 90 % tpos/tneg to tclk falling setup time (nrz mode) t su2 25 - - ns tclk falling to tpos/tneg hold time (nrz mode) t h2 25 - - ns tclk pulse width (rz mode) 236 252 ns txoe asserted low to tx driver hi-z - - 1 s tclk held low to driver hi-z 8 15 s rise time, all digital outputs (note 13) t r --85ns fall time, all digital outputs (note 13) t f --85ns rpos/rneg pulse width t rpw 200 244 300 ns rrtip/rring input to rpos/rneg output t rxd -85-ns rpos/rneg output to rclk output - - 5 ns
CS61881 8 ds451pp3 t r t f 10% 10% 90 % 90 % any digital output figure 1. signal rise and fall characteristics t rxd rtip rring t rpw t rpw rpos rneg t rxd figure 2. recovered clock and data switching characteristics tclk tpos / tneg t su2 t h2 t pwh2 t pw2 figure 3. transmit clock and data switching characteristics
CS61881 ds451pp3 9 2. theory of operation the CS61881 is designed to provide the analog front end (afe) for up to eight e1 lines. the device provides an interface to twisted pair or co-axial me- dia. a patented matched impedance technique is employed that reduces power and eliminates the need for matching resistors. as a result, the device can interface directly to the line through a trans- former without the need for matching resistors on either the receive side or the transmit side. 2.1 transmitter the CS61881 contains eight identical transmitters that each use a low power matched impedance driv- er to eliminate the need for external load matching resistors. as a result, the ttip/tring outputs can be direct connected to the pulse transformer allow- ing one hardware circuit for both 120 ? and 75 ? applications (see the applications section). in addi- tion, the matched impedance driver provides im- proved return loss when compared to solutions with external matching resistors. the appropriate line matching is selected via the cblsel control pin. the line drivers transmit data received in either nrz or rz format depending on the state of tclk. when tclk is driven with an external clock, nrz data sampled on tpos/tneg will be transmitted onto the line via ttip/tring. in this mode, a transmit pulse shape compliant to g.703 will be generated internally (see figure 4). data on tpos/tneg is sampled on the falling edge of tclk. if tclk is held high for at least 12 s, rz data driven into tpos/tneg is transmitted on ttip/tring. in this mode, the width of positive pulses is controlled by the width of the pulses on tpos and the width of negative pulses is con- trolled by the width of the pulses on tneg. the transmitter can be forced into a high impedance, low power state by holding tclk low. alternately, the txoe pin can be used to force all eight trans- mitters into a high impedance state. this feature is useful in applications that require redundancy. 2.2 receiver the CS61881 contains eight identical receivers that each use a matched impedance technique that al- lows a common set of external components for both 120 ? and 75 ? operation. this allows one stuffing option to accommodate both line impedances. the appropriate line matching is set via the cblsel pin. the receiver slices the incoming signal on rtip/ring and outputs the recovered data on rpos/rneg. to maximize the signal-to-noise ra- tio, the slicing threshold is dynamically adjusted based on the amplitude of the incoming signal. in the absence of a signal, a minimum threshold is maintained to reduce the occurrence of impulse noise. the receiver is capable of recovering signals with over 12 db of attenuation (referenced to 2.37 v nominal). 269 ns 244 ns 194 ns 219 ns 488 ns nominal pulse 0 10 50 80 90 100 110 120 -10 -20 percent of nominal peak voltage figure 4. mask of the pulse at the 2048 kbps interface
CS61881 10 ds451pp3 for added flexibility the receive polarity select pin (rps) is provided to define whether rpos/rneg have active high or low polarity. in addition, a re- ceiver power down pin (rpd ) is provided that powers down all receivers and places rpos, rneg, and rclk into a high impedance state. fi- nally, to support applications that employ external clock recovery, signals on rpos and rneg are xored and output on rclk. 2.3 loss-of-signal detector each receiver in the CS61881 has an analog loss- of-signal (los) detector for itu-g.775. an analog los condition will be signaled on alos when the input signal is less than 200 mv for 30 s (typ). the los condition is cleared once the signal am- plitude exceeds 250 mv. the alos signal will oc- cur between 10 and 255 bits as specified by itu g.775. notes: during los the rpos/rneg outputs will be active. 2.4 loopback the CS61881 provides two loopback modes for each port. the loop pins are used to activate or disable each port?s loopback operation. when the loop pins are left open, loopback operation is dis- abled. when a loop pin is tied either high or low, local or remote loopback is enabled respec- tively. 2.4.1 local loopback local loopback is selected by driving loop high. in this mode the data being transmitted on ttip/tring is internally connected to the receiv- er, and the rtip/rring inputs are disconnected. 2.4.2 remote loopback remote loopback is selected by driving loop low. in remote loopback, the rpos/rneg and rclk outputs are internally input to the transmit circuits for output on ttip/tring. in this mode the tclk, tpos, and tneg inputs are ignored. 2.5 5v logic support the CS61881 provides digital interface pins capa- ble of interfacing with 5 v logic. the overall power consumption will still be minimized because the ic?s core circuitry is powered by 3.3 v supplies. 2.6 jtag support the CS61881 supports the ieee boundary scan specification as described in the ieee 1149.1 stan- dards. a test access port (tap) is provided that consists of the tap controller, the boundary scan register (bsr), and the 5 standard pins (trstb, tck, tms, tdi, and tdo). a block diagram of the test access port is shown in figure 5. the test clock input (tck) is used to sample input data on tdi, and shift output data through tdo. the tms input is used to step the tap controller through its various states. the test access port consists of the tap control- ler, instruction register, by-pass register, device id register, and boundary scan register. the tms input is used to manipulate the tap controller to allow loading of the instruction and data registers. the instruction register is used to select test execu- tion or register access. the by-pass register pro- vides a direct connection between the tdi input and the tdo output. the device identification reg- ister contains an n-bit device identifier. the boundary scan register is used to support test- ing of ic inter-connectivity. using the boundary scan register, the digital input pins can be sampled and shifted out on tdo. in addition, this register can also be used to drive digital output pins to a user defined state. 2.6.1 tap controller the tap controller is a 16 state synchronous state machine clocked by the rising edge of tck. the tms input governs state transitions as shown in figure 6. the value shown next to each state tran- sition in the diagram is the value that must be on tms when it is sampled by the rising edge of tck.
CS61881 ds451pp3 11 mux tdi tck tdo jtag block boundary scan data register digital output pins digital input pins parallel latched output tap controller instruction (shift) register bypass data register device id data register parallel latched output tms trstb figure 5. test access port architecture test-logic-reset run-test/idle select-dr-scan capture-dr shift-dr exit1-dr pause-dr exit2-dr update-dr select-ir-scan capture-ir shift-ir exit1-ir pause-ir exit2-ir update-ir 1 0 0 1 1 0 1 0 1 1 0 1 0 0 1 0 1 0 0 1 1 0 1 1 0 1 0 0 1 0 1 0 figure 6. tap controller state diagram
CS61881 12 ds451pp3 2.6.2 test-logic-reset the test-logic-reset state is used to disable the test logic when the part is in normal mode of operation. this state is entered by asynchronously asserting trstb or forcing tms high for 5 tck periods. 2.6.3 run-test-idle the run-test-idle state is used to run tests. 2.6.4 select-dr-scan this is a temporary controller state. 2.6.5 capture-dr in this state, the boundary scan register captures input pin data if the current instruction is extest or sample/preload. 2.6.6 shift-dr in this controller state, the active test data register connected between tdi and tdo, as determined by the current instruction, shifts data out on tdo on each rising edge of tck. 2.6.7 exit1-dr this is a temporary state. the test data register se- lected by the current instruction retains its previous value. 2.6.8 pause-dr the pause state allows the test controller to tempo- rarily halt the shifting of data through the current test data register. 2.6.9 exit2-dr this is a temporary state. the test data register se- lected by the current instruction retains its previous value. 2.6.10 update-dr the boundary scan register is provided with a latched parallel output to prevent changes while data is shifted in response to the extest and sample/preload instructions. when the tap controller is in this state and the boundary scan register is selected, data is latched into the parallel output of this register from the shift-register path on the falling edge of tck. the data held at the latched parallel output changes only in this state. 2.6.11 select-ir-scan this is a temporary controller state. the test data register selected by the current instruction retains its previous state. 2.6.12 capture-ir in this controller state, the instruction register is loaded with a fixed value of "01" on the rising edge of j-tck. this supports fault-isolation of the board-level serial test data path. 2.6.13 shift-ir in this state, the shift register contained in the in- struction register is connected between tdi and tdo and shifts data one stage towards its serial output on each rising edge of tck. 2.6.14 exit1-ir this is a temporary state. the test data register se- lected by the current instruction retains its previous value. 2.6.15 pause-ir the pause state allows the test controller to tempo- rarily halt the shifting of data through the instruc- tion register. 2.6.16 exit2-ir this is a temporary state. the test data register se- lected by the current instruction retains its previous value. 2.6.17 update-ir the instruction shifted into the instruction register is latched into the parallel output from the shift-reg- ister path on the falling edge of j-tck. when the new instruction has been latched, it becomes the
CS61881 ds451pp3 13 current instruction. the test data registers selected by the current instruction retain their previous val- ue. 2.7 jtag instruction register (ir) the 2-bit instruction register selects the test to be performed and/or the data register to be accessed. the valid instructions are shifted in lsb first and are listed in table 1. 2.7.1 extest the extest instruction allows testing of off-chip circuitry and board-level interconnect. extest connects the bsr to the tdi and tdo pins. CS61881 inputs can be sampled by loading the bsr with the capture dr state. the sample values can then be viewed by shifting the bsr register us- ing the shift-dr state. the device output pins can be set by shifting a pattern into the boundary scan register and then using the update-dr state. 2.7.2 sample/preload the sample/preload instruction samples all device inputs and outputs. this instruction places the bsr between the tdi and tdo pins. the bsr is loaded with samples of the i/o pins by the cap- ture-dr state. 2.7.3 idcode the idcode instruction connects the device iden- tification register to the tdo pin. the device iden- tification code can then be shifted out tdo using the shift-dr state 2.7.4 bypass the bypass instruction connects a one tck de- lay register between tdi and tdo. the instruction is used to bypass the device. 2.8 boundary scan register (bsr) the bsr is a shift register that provides access to the digital i/o pins. the bsr is used to read and write the device pins to verify interchip connectiv- ity. each pin has a corresponding scan cell in the register. the pin to scan cell mapping is given in the bsr description shown in table 2. notes: 1) data is shifted lsb first into the bsr register. 2) hiz controls the rposx, rnegx, and rclkx pins. when hiz is high, the outputs are enabled; when hiz is low, the outputs are tri-stated. ir code instruction 000 extest 100 sample/preload 110 idcode 111 bypass table 1. jtag instructions
CS61881 14 ds451pp3 bsr bit pin name cell type bsr bit pin name cell type 0 loop0 i 43 rclk5 o 1 loop1 i 44 rpos5 o 2 loop2 i 45 rneg5 o 3loop3 i46 hiz5 note 1 4 loop4 i 47 alos5 o 5loop5 i48tclk4 i 6 loop6 i 49 tpos4 i 7loop7 i50tneg4 i 8 tclk1 i 51 rclk4 o 9 tpos1 i 52 rpos4 o 10 tneg1 i 53 rneg4 o 11 rclk1 o 54 hiz4 note 1 12 rpos1 o 55 alos4 o 13 rneg1 o 56 txoe i 14 hiz1 note 1 57 rps i 15 alos1 o 58 alos7 o 16 tclk0 i 59 rneg7 o 17 tpos0 i 60 rpos7 o 18 tneg0 i 61 rclk7 o 19 rclk0 o 62 hiz7 note 1 20 rpos0 o 63 tneg7 i 21 rneg0 o 64 tpos7 i 22 hiz0 note 1 65 tclk7 i 23 alos0 o 66 alos6 o 24 alos3 o 67 rneg6 o 25 rneg3 o 68 rpos6 o 26 rpos3 o 69 rclk6 o 27 rclk3 o 70 hiz6 note 1 28 hiz3 note 1 71 tneg6 i 29 tneg3 i 72 tpos6 i 30 tpos3 i 73 tclk6 i 31 tclk3 i 74 cblsel i 32 alos2 o 33 rneg2 o 34 rpos2 o 35 rclk2 o 36 hiz2 note 1 37 tneg2 i 38 tpos2 i 39 tclk2 i 40 tclk5 i 41 tpos5 i 42 tneg5 i table 2. boundary scan register
CS61881 ds451pp3 15 3. pin description 3.1 pinout - 144-pin lqfp 144 143 142 140 139 138 137 136 135 141 134 133 132 131 130 129 128 127 126 125 124 123 122 121 120 CS61881 144-pin lqfp 37 38 39 41 42 43 44 45 46 40 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 108 107 106 104 103 102 101 100 99 105 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 119 118 117 116 115 114 113 112 111 110 109 1 2 3 5 6 7 8 9 10 4 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 tneg7 rclk7 rpos7 rneg7 alos7 rtip7 rring7 tvcc7 ttip7 tring7 tgnd7 rring6 rtip6 tgnd6 tring6 ttip6 tvcc6 rtip5 rring5 tvcc5 ttip5 tring5 tgnd5 rring4 rtip4 tgnd4 tring4 ttip4 tvcc4 rps txoe alos4 rneg4 rpos4 rclk4 tneg4 tpos7 tclk7 alos6 rneg6 rpos6 rclk6 tneg6 tpos6 tclk6 rpd# gnd gnd gnd gnd gnd gnd vccio gndio rvcc0 rgnd0 loop0 loop1 loop2 loop3 loop4 loop5 loop6 loop7 tclk1 tpos1 tneg1 rclk1 rpos1 rneg1 alos1 tclk0 tpos4 tclk4 alos5 rneg5 rpos5 rclk5 tneg5 tpos5 tclk5 tdi tdo tck tms trst ref cblsel vccio gndio rvcc1 rgnd1 gnd gnd gnd gnd gnd nc nc tclk2 tpos2 tneg2 rclk2 rpos2 rneg2 alos2 tclk3 tpos3 tpos0 tneg0 rclk0 rpos0 rneg0 alos0 gnd tvcc0 ttip0 tring0 tgnd0 rtip0 rring0 tgnd1 tring1 ttip1 tvcc1 rring1 rtip1 tvcc2 ttip2 tring2 tgnd2 rtip2 rring2 tgnd3 tring3 ttip3 tvcc3 rring3 rtip3 alos3 rneg3 rpos3 rclk3 tneg3 (top view) figure 7. 144-pin lqfp pin description drawing
CS61881 16 ds451pp3 3.2 pinout - 160-pin fbga 1 2 3 4 5 6 7 8 9 10 11 12 13 14 txoe tck vccio rvcc 1 gnd nc tclk 5 rclk 4 tclk 4 rclk 5 tclk 2 rclk 3 tclk 3 rclk 2 rpos tdo cblsel ref gnd nc tpos 5 rpos 4 tpos 4 rpos 5 tpos 2 rpos 3 tpos 3 rpos 2 alos 5 tdi trst gnd gnd alos 2 tneg 5 rneg 4 tneg 4 rneg 5 tneg 2 rneg 3 tneg 3 rneg 2 alos 4 tms gndio rgnd 1 gnd alos 3 tvcc 5 tvcc 4 tvcc 4 tvcc 5 tvcc 2 tvcc 3 tvcc 3 tvcc 2 ttip 5 tring 4 ttip 4 tring 5 ttip 2 tring 3 ttip 3 tring 2 tgnd 5 tgnd 4 tgnd 4 tgnd 5 tgnd 2 tgnd 3 tgnd 3 tgnd 2 rring 5 rtip 4 rring 4 rtip 5 rring 2 rtip 3 rring 3 rtip 2 rring 6 rtip 7 rring 7 rtip 6 rring 1 rtip 0 rring 0 rtip 1 tgnd 6 tgnd 7 tgnd 7 tgnd 6 tgnd 1 tgnd 0 tgnd 0 tgnd 1 ttip 6 tring 7 ttip 7 tring 6 ttip 1 tring 0 ttip 0 tring 1 tvcc 6 tvcc 7 tvcc 7 tvcc 6 tvcc 1 tvcc 0 tvcc 0 tvcc 1 alos 7 gnd gndio loop 3 alos 0 rgnd 0 tneg 6 rneg 7 tneg 7 rneg 6 tneg 1 rneg 0 tneg 0 rneg 1 alos 6 gnd gnd loop 4 alos 1 loop 1 tpos 6 rpos 7 tpos 7 rpos 6 tpos 1 rpos 0 tpos 0 rpos 1 gnd gnd loop 0 loop 5 gnd loop 2 tclk 6 rclk 7 tclk 7 rclk 6 tclk 1 rclk 0 tclk 0 rclk 1 rpd# gnd vccio loop 6 loop 7 rvcc 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 a b c d e f g h j k l m n p a b c d e f g h j k l m n p CS61881 160 fbga (bottom view) figure 8. 160-pin fbga pin description drawing
CS61881 ds451pp3 17 3.3 pin descriptions power supplies vccio - power supply, digital interface, lqfp pins 17 & 92, bga pins g1 & g14. power supply for digital interface pins; typically +3.3 volts. gndio - ground, digital interface, lqfp pins 18 & 91. bga pins g4 & g11. power supply ground for the digital interface; typically 0 volts. rvcc0, rvcc1 - power supply, core circuitry, lqfp pins 19 & 90. bga pins h1 & h14. power supply for all subcircuits except the transmit driver; typically +3.3 volts rgnd0, rgnd1 - ground, core circuitry, lqfp pins 20 & 89, bga pins h4 & h11. ground for subcircuits except the transmit driver; typically 0.0 volts tvcc0 - power supply, transmit driver 0, lqfp pin 44, bga pins n4, p4. power supply for transmit driver 0; typically +3.3 volts. tgnd0 - ground, transmit driver 0, lqfp pin 47, bga pins n6, p6. power supply ground for transmit driver 0; typically 0 volts. tvcc1 - power supply, transmit driver 1, lqfp pin 53, bga pins l4, m4. tgnd1 - ground, transmit driver 1, lqfp pin 50, bga pins l6, m6. tvcc2 - power supply, transmit driver 2, lqfp pin 56, bga pins l11, m11. tgnd2 - ground, transmit driver 2, lqfp pin 59, bga pins l9, m9. tvcc3 - power supply, transmit driver 3, lqfp pin 65, bga pins n11, p11. tgnd3 - ground, transmit driver 3, lqfp pin 62, bga pins n9, p9. tvcc4 - power supply, transmit driver 4, lqfp pin 116, bga pins a11, b11. tgnd4 - ground, transmit driver 4, lqfp pin 119, bga pins a9, b9. tvcc5 - power supply, transmit driver 5, lqfp pin 125, bga pins c11, d11. tgnd5 - ground, transmit driver 5, lqfp pin 122, bga pins c9, d9. tvcc6 - power supply, transmit driver 6, lqfp pin 128, bga pins c4, d4. tgnd6 - ground, transmit driver 6, lqfp pin 131, bga pins c6, d6. tvcc7 - power supply, transmit driver 7, lqfp pin 137, bga pins a4, b4. tgnd7 - ground, transmit driver 7, lqfp pin 134, bga pins a6, b6. gnd - ground, lqfp pins 11-16, 43, 84-88, bga pins e2, f1-f4, g3, k2, j11-14, h12. connect these pins to ground to insure proper operation.
CS61881 18 ds451pp3 control rpd - receiver power down, lqfp pin 10, bga pin e1 when rpd is low, the complete receive path for all ports is powered down the output pins rpos, rneg and rclk are switched to the high impedance state. txoe - transmitter output enable, lqfp pin 114, bga pin e14 when txoe is asserted low, all of the tx drivers are forced to a high impedance state in 1 s (max). all other internal circuitry remains active. rps - receiver polarity select, lqfp pin 115, bga pin e13 this pin is used to set the polarity of rpos/rneg. when rps is high, rpos/rneg has an active high output polarity. when rps is low, rpos/rneg have an active low polarity. loop0 - loopback mode select port #0, lqfp pin 21, bga pin g2 this pin selects the loopback mode for liu transceiver 0. the mode is selected as follows: no loopback - loop0 is left open (unconnected) local loopback - loop0 is tied high. in this mode, data transmitted on ttip0 and tring0 is looped back into port 0 ? s receiver and output on rpos0 and rneg0. data present on rtip0 and rring0 is ignored. remote loopback - loop0 is tied low. in this mode, data received on rtip0 and rring0 is looped back for retransmission on ttip0 and tring0. data on tpos0 and tneg0 is ignored. loop1 - loopback mode select port #1, lqfp pin 22, bga pin h3 loop2 - loopback mode select port #2, lqfp pin 23, bga pin h2 loop3 - loopback mode select port #3, lqfp pin 24, bga pin j4 loop4 - loopback mode select port #4, lqfp pin 25, bga pin j3 loop5 - loopback mode select port #5, lqfp pin 26, bga pin j2 loop6 - loopback mode select port #6, lqfp pin 27, bga pin j1 loop7 - loopback mode select port #7, lqfp pin 28, bga pin k1
CS61881 ds451pp3 19 cblsel - cable impedance select, lqfp pin 93, bga pin g13 this pin is used to select the impedance matching network used by all eight transceivers. the transmitters always make use of an internal cable matching network to eliminate external line matching component. the receiver can be operated with either internal or external line matching. the cblsel input sets the desired cable matching for the transmitter and configures the receiver for either internal or external impedance matching. the application section provides sample schematics for both internal and external rx matching. status alos0 - analog loss of signal output port #0, lqfp pin 42, bga pin k4 alos0 is asserted ? high ? to indicate analog loss of signal (los) compliant to itu-t g.775. alos1 - analog loss of signal port #1, lqfp pin 35, bga pin k3 alos2 - analog loss of signal port #2, lqfp pin 75, bga pin k12 alos3 - analog loss of signal port #3, lqfp pin 68, bga pin k11 alos4 - analog loss of signal port #4, lqfp pin 113, bga pin e11 alos5 - analog loss of signal port #5, lqfp pin 106, bga pin e12 alos6 - analog loss of signal port #6, lqfp pin 3, bga pin e3 alos7 - analog loss of signal port #7, lqfp pin 140, bga pin e4 rx/tx data i/o tclk0 - transmit clock input, lqfp pin 36, bga pin n1. if a 2.048mhz transmit clock is input on this pin, the tpos and tneg inputs function as nrz inputs. in this mode, the falling edge of tclk samples nrz encoded data on tpos and tneg. if tclk0 is held high, the tpos and tneg inputs function as rz inputs. in this mode, the transmit pulse width is set by the duty cycle of the signal input on tpos and tneg. to enter this mode, tclk must be held high for at least 12 cblsel cable tx match rx matching mode no connect 120 ? ? ? high 75 ? ? ? low 75 ? ? ?
CS61881 20 ds451pp3 tpos0 - transmit positive pulse input, lqfp pin 37, bga pin n2. tneg0 - transmit negative pulse input, lqfp pin 38, bga pin n3. when tclk0 is active (nrz input mode), data on tpos0 and tneg0 is sampled on the falling edge of tclk0 and transmitted onto the line at ttip0 and tring0 respectively. an input on tpos0 results in transmission of a positive pulse; an input on tneg0 results in transmission of a negative pulse. when tclk0 is held high (rz input mode), the pulse widths of tpos0 and tneg0 determine the pulse widths output on ttip0 and tring0. if tpos0 and tring0 are high at the same time, ttip0 and tring0 will both be 0. rclk0 - receive clock output, lqfp pin 39, bga pin p1. this output is the xor of rpos and rneg. it can be used for external clock recovery circuits. this output is in a high-impedance state when rpd is low. rpos0 - receive positive pulse output, lqfp pin 40, bga pin p2. rneg0 - receive negative pulse output, lqfp pin 41, bga pin p3. these pins output the rz data recovered by the receive slicers. a positive pulse on rtip with respect to rring generates a logic 1 on rpos; a positive pulse on rring with respect to rtip generates a logic 1 on rneg. the polarity of the output on rpos/rneg is selectable with the rps pin. note: rpos and rneg will be active when the transceiver is in los. rpos/rneg will be in a high impedance state if the rpd pin is low. tclk1 - transmit clock input port 1, lqfp pin 29, bga pin l1. tpos1 - transmit positive pulse input, lqfp pin 30, bga pin l2. tneg1 - transmit negative pulse input, lqfp pin 31, bga pin l3. rclk1 - receive clock output, lqfp pin 32, bga pin m1. rpos1 - receive positive pulse output, lqfp pin 33, bga pin m2. rneg1 - receive negative pulse output, lqfp pin 34, bga pin m3. tclk2 - transmit clock input port 2, lqfp pin 81, bga pin l14. tpos2 - transmit positive pulse input, lqfp pin 80, bga pin l13. tneg2 - transmit negative pulse input, lqfp pin 79, bga pin l12. rclk2 - receive clock output, lqfp pin 78, bga pin m14. rpos2 - receive positive pulse output, lqfp pin 77, bga pin m13. rneg2 - receive negative pulse output, lqfp pin 76, bga pin m12. tclk3 - transmit clock input port 3, lqfp pin 74, bga pin n14. tpos3 - transmit positive pulse input, lqfp pin 73, bga pin n13. tneg3 - transmit negative pulse input, lqfp pin 72, bga pin l2. rclk3 - receive clock output, lqfp pin 71, bga pin p14. rpos3 - receive positive pulse output, lqfp pin 70, bga pin p13. rneg3 - receive negative pulse output, lqfp pin 69, bga pin p12.
CS61881 ds451pp3 21 tclk4 - transmit clock input port 4, lqfp pin 107, bga pin b14. tpos4 - transmit positive pulse input, lqfp pin 108, bga pin b13. tneg4 - transmit negative pulse input, lqfp pin 109, bga pin b12. rclk4 - receive clock output, lqfp pin 110, bga pin a14. rpos4 - receive positive pulse output, lqfp pin 111, bga pin a13. rneg4 - receive negative pulse output, lqfp pin 112, bga pin a12. tclk5 - transmit clock input port 5, lqfp pin 100, bga pin d14 tpos5 - transmit positive pulse input, lqfp pin 101, bga pin d13. tneg5 - transmit negative pulse input, lqfp pin 102, bga pin d12. rclk5 - receive clock output, lqfp pin 103, bga pin c14. rpos5 - receive positive pulse output, lqfp pin 104, bga pin c13. rneg5 - receive negative pulse output, lqfp pin 105, bga pin c12. tclk6 - transmit clock input port 6, lqfp pin 9, bga pin d1. tpos6 - transmit positive pulse input, lqfp pin 8, bga pin d2. tneg6 - transmit negative pulse input, lqfp pin 7, bga pin d3. rclk6 - receive clock output, lqfp pin 6, bga pin c1. rpos6 - receive positive pulse output, lqfp pin 5, bga pin c2. rneg6 - receive negative pulse output, lqfp pin 4, bga pin c3. tclk7 - transmit clock input port 7, lqfp pin 2, bga pin b1. tpos7 - transmit positive pulse input, lqfp pin 1, bga pin b2. tneg7 - transmit negative pulse input, lqfp pin 144, bga pin b3. rclk7 - receive clock output, lqfp pin 143, bga pin a1. rpos7 - receive positive pulse output, lqfp pin 142, bga pin a2. rneg7 - receive negative pulse output, lqfp pin 141, bga pin a3. ttip0 - transmit tip output, lqfp pin 45, bga pin n5. tring0 - transmit ring output, lqfp pin 46, bga pin p5. these pins are the output of the differential transmit driver. the driver matches impedances for 75 ? unbalanced and 120 ? balanced lines requiring only a 1:1.15 transformer. the cblsel pin is used to select the appropriate impedance for line matching. note: ttip and tring are forced to a high impedance state when the tclk pin is low for over 12 s. rtip0 - receive tip input, lqfp pin 48, bga pin p7. rring0 - receive ring input, lqfp pin 49, bga pin n7. the pins are the differential line inputs to the receiver. the receiver internally matches impedances for 75 ? unbalanced and 120 ? balanced lines requiring only a 1:2 transformer, two external 15 ? resistors, and one capacitor. the cblsel pin is used to select the appropriate impedance for line matching. data recovered from the signal input on these pins is output via rpos, rneg, and rclk.
CS61881 22 ds451pp3 ttip1 - transmit tip output, lqfp pin 52, bga pin l5. tring1 - transmit ring output, lqfp pin 51, bga pin m5. rtip1 - receive tip output, lqfp pin 55, bga pin m7. rring1 - receive ring output, lqfp pin 54, bga pin l7. ttip2 - transmit tip output, lqfp pin 57, bga pin l10. tring2 - transmit ring output, lqfp pin 58, bga pin m10. rtip2 - receive tip output, lqfp pin 60, bga pin m8. rring2 - receive ring output, lqfp pin 61, bga pin l8. ttip3 - transmit tip output, lqfp pin 64, bga pin n10. tring3 - transmit ring output, lqfp pin 63, bga pin p10. rtip3 - receive tip output, lqfp pin 67, bga pin p8. rring3 - receive ring output, lqfp pin 66, bga pin n8. ttip4 - transmit tip output, lqfp pin 117, bga pin b10. tring4 - transmit ring output, lqfp pin 118, bga pin a10. rtip4 - receive tip output, lqfp pin 120, bga pin a8. rring4 - receive ring output, lqfp pin 121, bga pin b8. ttip5 - transmit tip output, lqfp pin 124, bga pin d10. tring5 - transmit ring output, lqfp pin 123, bga pin c10. rtip5 - receive tip output, lqfp pin 127, bga pin c8. rring5 - receive ring output, lqfp pin 126, bga pin d8. ttip6 - transmit tip output, lqfp pin 129, bga pin d5. tring6 - transmit ring output, lqfp pin 130, bga pin c5. rtip6 - receive tip output, lqfp pin 132, bga pin c7. rring6 - receive ring output, lqfp pin 133, bga pin d7. ttip7 - transmit tip output, lqfp pin 136, bga pin b5. tring7 - transmit ring output, lqfp pin 135, bga pin a5. rtip7 - receive tip output, lqfp pin 139, bga pin a7. rring7 - receive ring output, lqfp pin 138, bga pin b7. jtag test interface trst - jtag reset, lqfp pin 95, bga pin g12. this active low input resets the jtag controller. this input is pulled up internally and may be left as a nc. tms - jtag test mode select input, lqfp pin 96, bga pin f11. this input enables the jtag serial port when active high. this input is sampled on the rising edge of jtck. this input is pulled up internally and may be left as a nc.
CS61881 ds451pp3 23 tck - jtag test clock, lqfp pin 97, bga pin f14. data on tdi is valid on the rising edge of tck. data on tdo is valid on the falling edge of tck. when tck is stopped high or low, the contents of all jtag registers remain unchanged. tie low when not used. tdo- jtag test data output, lqfp pin 98, bga pin f13. tag test data is shifted out of the device on this pin. data is output on the falling edge of tck. leave as nc when not used. tdi- jtag test data input, lqfp pin 99, bga pin f12. jtag test data is shifted into the device using this pin. the pin is sampled on the rising edge of tck. tdi is pulled up internally and may be left as a nc when not used. miscellaneous ref - reference output, lqfp pin 94, bga pin h13. this pin must be tied to ground through 13.3 k ? 1% resistor. no connects nc - no connects, lqfp pin 82-83, bga pin k13-k14.
CS61881 24 ds451pp3 4. package dimensions inches millimeters dim min nom max min nom max a --- 0.55 0.063 --- 1.40 1.60 a1 0.002 0.004 0.006 0.05 0.10 0.15 b 0.007 0.008 0.011 0.17 0.20 0.27 d 0.854 0.866 bsc 0.878 21.70 22.0 bsc 22.30 d1 0.783 0.787 bsc 0.791 19.90 20.0 bsc 20.10 e 0.854 0.866 bsc 0.878 21.70 22.0 bsc 22.30 e1 0.783 0.787 bsc 0.791 19.90 20.0 bsc 20.10 e* 0.016 0.020 0.024 0.40 0.50 bsc 0.60 0.000 4 7.000 0.00 4 7.00 l 0.018 0.024 0.030 0.45 0.60 0.75 * nominal pin pitch is 0.50 mm controlling dimension is mm. jedec designation: ms022 144l lqfp package drawing e1 e d1 d 1 e l b a1 a
CS61881 ds451pp3 25 notes: 14. all dimensions and tolerance conform to asme y 14.5 m - 1994. dimension is measured at the maximum solder ball diameter, parallel to primary datum . primary datum and seating plane are defined by the spherical crowns of the solder balls. 4. maximum mold to substrate offset shall be 0.127. 5. the surface finish of the package shall be edm charmille #18 - #21. 6. unless otherwise specified tolerance: decimal 0.05; angular 2 jedec #: mo-158 top view bottom view a b c d e f g h i j k l m pin #a1 corner 14 13 12 11 10 9 8 7 6 5 4 3 21 4.72 0.10 1.00 ref 4.72 0.10 1.00 ref 15.00/m+3a1be0.20 13.00 0.20 13.00 0.20 pin #a1 identifier (shiny) ? 1.00x0.15 depth 8xr0.5 3x ? 1.00 4x1.20x45 0.20 (4x) a 13.00 1.00 0.50 0.10 1.00 13.00 2 ? 0.30 c a b ? 0.10 c m side view 1.61 0.19 0.40 0.10 0.85 0.36 0.04 0.15 c c seating plane 3 b 15.00/m+3a1be0.20 a a 3.0 160-ball fbga (2 layer) package drawing c c 2 3
CS61881 26 ds451pp3 5. applications + rgnd +3.3v rv+ t1 1:2 ref CS61881 one channel transmit line t2 1:1.15 r1 r2 13.3k ? gnd cblsel tv+ vccio +3.3v + 0.1 f tgnd + gndio nc 120 ? cable +3.3v note 1 note 2 receive line rtip rring tring ttip 0.1 f 0.1 f 68 f 0.1 f 75 ? cable figure 9. internal rx impedance matching notes: 1) required capacitor between each tvcc, rvcc, vccio and tgnd, rgnd, gndio respectively. 2) common decoupling capacitor for all tvcc and tgnd pins. component 75 ? coaxial cable 120 ? coaxial cable r1 ( ? ) 15 15 r2 ( ? ) 15 15
CS61881 ds451pp3 27 + rgnd +3.3v rv+ t1 1:2 ref CS61881 one channel transmit line t2 1:1.15 gnd nc gnd cblsel tv+ vccio +3.3v + tgnd + gndio r1 r2 1k ? 1k ? 13.3k ? note 1 note 2 0.1 f 68 f0.1 f 0.1 f receive line rtip rring tring ttip 120 ? cable 75 ? cable 0.1 f figure 10. external rx impedance matching notes: 1) required capacitor between each tvcc, rvcc, vccio and tgnd, rgnd, gndio respectively. 2) common decoupling capacitor for all tvcc and tgnd pins. component e1 75 ? coaxial cable e1 120 ? twisted pair cable r1 ( ? ) 9.31 15 r2 ( ? ) 9.31 15

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