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the NWK954 is a fully integrated, unmanaged, 4-port fast ethernet repeater conforming to the ieee 802.3 100base-tx standard. the device integrates the 802.3 repeater functions with four 100base-tx phy modules, enabling direct connection to the isolation transformers with no additional phy components. it has built-in led drivers for display of port activity and network utilization. there is a local expansion port which allows up to six NWK954s to be cascaded to form a 24-port repeater with no additional components. with the addition of simple backplane driver/receivers, up to eight 24-port repeaters can be stacked. the NWK954 is supplied in a 128-pin pqfp and interfaces to the twisted pair media through 1:1 isolation transformers. quad rj45 quad magnetics NWK954 quad magnetics NWK954 quad magnetics NWK954 quad magnetics NWK954 quad magnetics NWK954 quad magnetics NWK954 clock drivers oscillator backplane buffers backplane controls local expansion bus fig. 1 system block diagram features n compliant with ieee 802.3 100base-tx repeater unit specification n incorporates four ieee 802.3 compliant 100base-tx ports n local expansion port for cascading to 24 ports n stackable backplane for expansion up to 192 ports n link/activity led and receive error led for each port n collision led n five led network utilization display n base line wander correction n power saving on unused ports n driven from a single 25mhz clock n single 5v supply n low power cmos technology n 128-pin pqfp package order ing information NWK954d/cg/gh1n NWK954 quad fast ethernet repeater preliminary information supersedes january 1998 version, ds4842 - 1.1 ds4842-2.1 april 1998
NWK954 2 quad rj45 quad magnetics NWK954 quad magnetics NWK954 quad magnetics NWK954 quad magnetics NWK954 quad magnetics NWK954 quad magnetics NWK954 clock drivers oscillator backplane buffers backplane controls local expansion bus hub 0 hub 1 hub 2 hub 3 hub 4 hub 5 hub 6 hub 7 fig. 2 192-port stacked repeater
NWK954 3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 51 62 63 64 ird3 ird2 diggnd2 digvdd2 p0_rxled_n p0_erled_n p1_rxled_n p1_erled_n p2_rxled_n p2_erled_n p3_rxled_n p3_erled_n actled_n4 actled_n3 actled_n2 actled_n1 actled_n0 diggnd3 digvdd3 colled_n bpdoe_n bpdie_n bpcoloe_n bpactout_n bpcolin_n bpactin_n1 bpactin_n2 bpactin_n3 diggnd4 digvdd4 ird1 ird0 ird4 lactout_n digvdd1 diggnd1 reset_n lactin_n1 lactin_n2 lactin_n3 lactin_n4 lactin_n5 tdc tdio ta4 ta3 ta2 subvdd1 p0_rxgnd3 p0_rxvdd3 p0_rxvdd2 p0_rxgnd2 p0_rxgnd1 p0_rxvdd1 p0_rxin p0_rxip p0_txvdd3 p0_txgnd3 p0_txref p0_txgnd2 p0_txvdd2 p0_txon p0_txop p0_gnd1 bpclk bpcol_n diggnd5 digvdd5 bpactin_n4 bpactin_n5 bpactin_n6 bpactin_n7 psen0 psen1 txclkin diggnd6 digvdd6 vrefgnd vrefvdd subvdd2 p3_rxgnd3 p3_rxvdd3 p3_rxvdd2 p3_rxgnd2 p3_rxgnd1 p3?xvdd1 p3_rxin p3_rxip p3_txvdd3 p3_txgnd3 p3_txref p3_txgnd2 p3_txvdd2 p3_txon p3_txop p3_txgnd1 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 p1_txgnd1 p1_txop p1_txon p1_txvdd2 p1_txgnd2 p1_txref p1_txgnd3 p1_txvdd3 p1_rxip p1_rxin p1_rxvdd1 p1_rxgnd1 p1_rxgnd2 p1_rxvdd2 p1_rxvdd3 p1_rxgnd3 p2_rxgnd3 p2_rxvdd3 p2_rxvdd2 p2_rxgnd2 p2_rxgnd1 p2_rxvdd1 p2_rxin p2_rxip p2_txvdd3 p2_txgnd3 p2_txref p2_txgnd2 p2_txvdd2 p2_txon p2_txop p2_txgnd1 NWK954 fig. 3 pin connections C top view functional description overvlew the NWK954 is a mixed-signal cmos device which integrates all of the functions required for an unmanaged 4- port 100base tx repeater as defined in the ieee 802.3 standard. the device incorporates all of the necessary 100base-tx phy functions to allow direct interfacing to a quad 1:1 magnetics module with a modest number of external passive components. the built-in expansion port allows cascading of up to 6 NWK954s to build a 24-port repeater with no additional components and also allows stacking of up to eight 24-port repeaters with the addition of simple backplane driver/receiver components. the operating status of the device is indicated on 14 outputs designed to directly drive leds. this high level of integration combined with low power consumption and low pin count offers an efficient and low cost solution for fast ethernet unmanaged repeater design. compliance with standards the NWK954 is designed for compliance with the ieee 802.3 standard, clause 24 (100base-x pcs and pma), clause 25 (100base-tx pmd) and clause 27 (repeater for 100mb/s baseband networks). clause 25 references the fddi twisted pair pmd standard, henceforth referred to as tp-pmd. compatibility with other devices the NWK954 is designed to connect directly to 5 other NWK954 devices using the expansion bus. the expansion port is identical to that used on the nwk950 repeater controller. the expansion port may be connected to a backplane through external driver/receivers. the backplane specification is identical to that used by the nwk950, so repeaters using the nwk950 may be stacked with repeaters using the NWK954. gp128
NWK954 4 port 0 transceiver p0_txop p0_txon p0_txref p0_rxip p0_rxin port 1 transceiver p1_txop p1_txon p1_txref p1_rxip p1_rxin port 2 transceiver p2_txop p2_txon p2_txref p2_rxip p2_rxin port 3 transceiver p3_txop p3_txon p3_txref p3_rxip p3_rxin reset_n psen [1:0] txclkin ta [4:2] voltage reference repeater controller power-on reset ird [4:0] lactout_n lactin_n bpactout_n bpactin_ n [7:1] bpdie_n bpdoe_n bpclk bpcol_n bpcolin_n bpcoloe_n expansion port actled_n [4:0] colled_n p0_rxled_n p0_erled_n p1_rxled_n p1_erled_n p2_rxled_n p2_erled_n p3_rxled_n p3_erled_n led drivers transceiver control scrambler descrambler line monitor sipo and decoder clock recovery equalizer and blw correction piso and encoder 125mhz synthesizer rx signal detect tx driver port [3:0] transceiver details fig. 4 NWK954 block diagram
NWK954 5 basic repeater function the repeater controller monitors activity on the 4 twisted pair ports and on the expansion port. when a packet is received on one of the twisted pair ports it is forwarded to the other 3 twisted pair ports and to the expansion port. when a packet is received on the expansion port it is forwarded to all 4 twisted pair ports. when receive activity is detected on 2 or more ports the repeater controller will send the jam signal to all twisted pair ports for the duration of all activity associated with the collision event. jabber protection the repeater controller provides receive jabber protection to ensure that the network is not disrupted by excessively long data streams. if a received data stream exceeds 65,536 bit times then the receiving port will be shutdown. in the shutdown state data received on the faulty port is ignored and packets received from other ports are not transmitted to the faulty port. a port will recover from the shutdown state when the incoming data stream ends or if the device is reset. auto-partition function the auto-partition function prevents faulty behaviour on a network segment from disrupting the entire network. the repeater controller counts consecutive collisions on each port and will partition a port that causes more than 60 consecutive collisions. in the partitioned state, packets received on the faulty port will be ignored but packets received from other ports will continue to be transmitted to the faulty port. the port will recover from the partitioned state when valid activity is detected on the port or if the device is reset. carrier integrity monitor the repeater controller detects false carrier events on all ports. a false carrier is defined as receive activity that does not commence with the correct start-of-packet sequence. when a false carrier event is detected, the repeater controller will transmit the jam signal on all ports for the duration of the false carrier event provided it does not exceed 450-500 bit times. after this time the port will be isolated and the jam signal will cease. the NWK954 will also isolate a port that suffers 2 successive false carrier events. in the isolated state, packets received from the faulty port are ignored and packets received from other ports are not transmitted to the faulty port. a port will recover from the isolated state when a valid inter-packet gap is detected and is followed by either a valid packet exceeding 450- 500 bit times or by an idle sequence exceeding 33000 ( 25%) bit times. expansion port the expansion port allows up to 6 NWK954s to be cascaded. this allows a 24-port hub to be built with no additional external components. the expansion port includes a 5-bit parallel bidirectional data bus (ird) which carries unscrambled symbol data and a 25mhz sampling clock (bpclk). each NWK954 indicates receive activity on any of its 4 twisted pair ports by asserting the local activity output (lactout_n). the lactout_n signals from each NWK954 connect to the local activity inputs (lactin_n) of all the other cascaded NWK954s. when a collision occurs between 2 twisted pair ports on an NWK954, the event is communicated to other cascaded NWK954s by asserting the collision signal (bpcol_n). this instructs all cascaded NWK954s to transmit the jam signal for the duration of the collision event. bpcol_n is also asserted when a collision occurs between 2 twisted pair ports on different NWK954s. backplane the expansion port allows hubs to be stacked via a backplane bus. this requires the addition of some simple external driver/ receivers. the functional requirement for these components is illustrated in fig. 6. contact mitel for full details of recommended components. bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin 5 5 5 5 5 5 5 5 5 5 5 5 clock driver 25mhz oscillator fig. 5 cascaded NWK954s
NWK954 6 bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin bpactin_ n [7:1] lactin_n [5:1] lactout_n bpcolin_n bpcol_n bpclk ird [4:0] txclkin bpactin_ n [7:1] bpactout_n lactin_n [5:1] lactout_n bpcolin_n bpclk bpcol_n ird [4:0] bpdoe_n bpdie_n bpcoloe_n txclkin 5 5 5 5 5 5 5 5 5 5 5 5 clock driver 25mhz oscillator 7 7 7 7 7 7 7 5 backplane data backplane clock backplane activity backplane collision ? fig. 6 external backplane drivers/receivers
NWK954 7 the ird bus in each hub is connected to the 5-bit backplane bus via a bidirectional buffer. this allows data to be driven from any hub to all other hubs in the stack. the bidirectional buffer is controlled by 2 control signals (bpdoe_n and bpdie_n) which can be taken from any one of the NWK954 devices in the hub. bpdoe_n and bpdie_n default to being active low but can be independently changed to active high by the addition of an external pull-down resistor, as shown in fig.7. this resistor is sensed during reset_n = 0. data transfers on the backplane are synchronous to the backplane clock. the backplane clock is supplied by whichever hub supplies the data. when receiving data from the backplane, the backplane clock is enabled onto the local bpclk signal by bpdie_n. bpclk connects to all NWK954s in the hub. when a hub supplies data to the backplane, bpclk is driven locally and is enabled onto the backplane by bpdoe_n. each hub in a stack indicates receive activity on any of its twisted pair ports by asserting the backplane activity output (bpactout_n). bpactout_n can be taken from any one of the NWK954s and drives one of the backplane activity signals via an external buffer. the backplane supports up to 8 backplane activity signals. the backplane activity signals from up to 7 other hubs connect to the local bpactin_n signals which are input to all NWK954s in the hub. when a collision occurs between 2 twisted pair ports in a hub, the event is communicated to other stacked hubs by bpcol_n which is enabled onto the backplane collision signal by bpcoloe_n. bpcoloe_n defaults to being active low but can be changed to active high by the addition of an external pull-down resistor. this resistor is sensed during reset_n=0. bpcol_n is also asserted when a collision occurs between two twisted pair ports on different hubs. collision events are cormmunicated to all hubs through the bpcolin_n signal which connects to all NWK954s in the hub. led drivers the NWK954 provides 2 led drivers per port to indicate port status (rxled_n and erled_n), one led driver to indicate collisions (colled_n) and 5 led drivers to indicate network utilization (actled_n). the led drivers pull the output pins low to turn the leds on. the leds are turned on or off for a minimum of 40ms to ensure observability. the port status leds indicate a variety of conditions and provide rapid diagnosis of network faults,as shown in table 1. the network utilization leds are turned on at the thresholds given in table 2. fig. 7 polarity selection on bpdoe_n, bpdie_n and bpcoloe_n port status no incoming signal incoming signal but no idle pattern recognized* link established, no incoming data packets link established, receiving data packets link established, but port partitioned due to excessive collisions or port isolated due to false carriers or port disabled due to jabber link established, false carrier or invalid data detected rxled_n off off on flash on flash off erled_n off flash off off on flash on 10k NWK954 NWK954 enable signal configured for active low operation enable signal configured for active high operation * in 802.3 a continuous signal of the required amplitude is sufficient to establish a link but no data can be passed to the repeater controller until the descrambler has locked on to an idle pattern. table 1 led actled_n0 actled_n1 actled_n2 actled_n3 actled_n4 network utilization >1% >125% >25% >50% >60% table 2
NWK954 8 100base-tx receiver the 100base-tx receiver recovers data from up to 140m of cat5 utp cable. received data is decoded and descrambled and presented to the repeater controller as 5-bit symbols. the transceiver controller sequences the start-up of the receiver and does not allow data to be passed to the repeater controller until the receiver is fully initialized and a link is established and the descrambler is synchronized. after start-up the transceiver controller monitors the receiver and takes corrective action if a fault is detected. the signal detect continuously monitors the level on the rxip/rxin differential input and indicates to the transceiver controller when the signal amplitude is within the range of the equalizer. the acceptable level is considerably less than that specified in the 802.3 standard because the NWK954 receiver is designed for recovery of signals from up to 140m of cat5 utp cable. the equalizer compensates for the signal attenuation and distortion resulting from transmission down the cable and through the isolation transformers. the equalizer self- adjusts within 1ms of signal detect indicating that the incoming signal is within the acceptable range. thereafter the equalizer continuously adjusts to small variations in signal level without corrupting the received data. the 100base-tx mlt3 code contains significant low frequency components which are not passed through the isolation transformers and cannot be restored by the equalizer. this leads to a phenomenon known as baseline wander (blw) which will cause an unacceptable increase in error rate if not corrected. the NWK954 employs a quantized feedback technique to restore the low frequency components and thus maintain a very low error rate even when receiving signals such as the killer packet described in the tp-pmd specification. the clock recovery circuit uses a phase-locked loop (pll) to derive a sampling clock from the incoming signal. the recovered clock runs at the symbol bit rate (nominally 125mhz) and is used to clock the mlt3 decoder and the serial-to-parallel converter (sipo). the recovered clock is divided by 5 to generate the receive clock which is used to strobe received data into the repeater controller. the transceiver controller monitors behaviour of the pll and re-initializes the receiver if lock is lost. the sipo and decoder convert the received signal from serial mlt3 to 5-bit parallel nrz. the link monitor implements the 802.3 link monitor state machine which indicates when a sustained signal of appropriate quality and amplitude is being received. this is the first stage in establishing a link; no data can be passed to the repeater controller until the descrambler is synchronized to the incoming signal. descrambler synchronization is established during reception of the idle pattern. after synchronization is established, the descrambler output is continuously monitored and the descrambler is re-synchronized if insufficient idle sequences are detected. 100base-tx transmitter the 100base-tx transmitter generates a 125mhz transmit clock and uses it to serialize and transmit the 5-bit symbol data input from the repeater controller. the transceiver controller sequences the start-up of the transmitter and does not allow transmission onto the twisted pair until the transmitter is fully initialized. after start-up the transceiver controller monitors the transmitter and takes corrective action if a fault is detected. the scrambler mixes the symbol data with a 2047-bit pseudo- random code, in accordance with the tp-pmd standard. the four scramblers in the NWK954 are seeded with different values based on the ta[4:2] input. when multiple NWK954s are cascaded to make a hub, each NWK954 should have a unique value on ta[4:2] to ensure that all of the scramblers in the hub are seeded with different values. the 125mhz synthesizer employs a phase-locked loop (pll) to generate a 125mhz timing reference from the 25mhz reference clock. the transceiver controller monitors behaviour of the pll and re-initializes the synthesizer if lock is lost. the piso and encoder take nrz-coded symbols from the scrambler, and convert them to serial mlt3 for outputting to the tx driver. the piso and encoder do not operate until the 125mhz synthesizer is locked to the 25mhz reference. this avoids transmission of spurious signals onto the twisted pair. the tx driver outputs the differential signal onto the txop and txon pins. it operates with 1:1 magnetics to provide impedance matching and amplification of the signal in accordance with the 802.3 specifications. the transmit current is governed by the current through the txref100 pin, which must be grounded through a resistor as described in table 10. power saving on unused ports the NWK954 incorporates a feature that will automatically shutdown the transceivers on unused ports. the shutdown occurs if signal detect indicates that no signal has been received for 25s. the transceiver is re-started when signal detect indicates that an incoming signal has been detected. this feature is intended to save power and reduce noise in unconnected ports. in certain circumstances, such as in port-to-port links between hubs, this feature should be suppressed by appropriate setting of the psen [1:0] inputs, as shown in table 3. initialization the NWK954 incorporates a power-on reset circuit for self- initialization on power-up. during power-on reset the open drain reset_n pin is driven low. it will not normally be necessary for the user to drive reset_n because the NWK954 is designed to automatically recover from fault conditions; however, if required, the user may initialize the device by pulsing reset_n low. function power saving disabled on all ports power saving enabled on ports 1, 2 and 3, disabled on port 0 power saving enabled on ports 0, 1 and 2, disabled on port 3 power saving enabled on all ports psen1 0 0 1 1 psen0 0 1 0 1 table 3 power saving functions
NWK954 9 pin descriptions active low signals are denoted by the _n suffix; all other signals are active high network interface signal p0_rxip p0_rxin p0_txop p0_txon p0_txref p1_rxip p1_rxin p1_txop p1_txon p1_txref p2_rxip p2_rxin p2_txop p2_txon p2_txref p3_rxip p3_rxin p3_txop p3_txon p3_txref description ( 1 ) differential receive signal from port 0 magnetics ( 2 ) differential receive signal from port 0 magnetics ( 1 ) differential transmit signal to port 0 magnetics ( 2 ) differential transmit signal to port 0 magnetics port 0 transmitter current setting pin, grounded externally ( 1 ) differential receive signal from port 1 magnetics ( 2 ) differential receive signal from port 1 magnetics ( 1 ) differential transmit signal to port 1 magnetics ( 2 ) differential transmit signal to port 1 magnetics port 1 transmitter current setting pin, grounded extemally ( 1 ) differential receive signal from port 2 magnetics ( 2 ) differential receive signal from port 2 magnetics ( 1 ) differential transmit signal to port 2 magnetics ( 2 ) differential transmit signal to port 2 magnetics port 2 transmitter current setting pin, grounded extemally ( 1 ) differential receive signal from port 3 magnetics ( 2 ) differential receive signal from port 3 magnetics ( 1 ) differential transmit signal to port 3 magnetics ( 2 ) differential transmit signal to port 3 magnetics port 3 transmitter current setting pin, grounded extemally table 4 expansion port signal ird4 ird3 ird2 ird1 ird0 lactout_n lactin_n5 lactin_n4 lactin_n3 lactin_n2 lactin_n1 bpactout_n description inter-repeater data . transfers 5-bit symbol data between NWK954s on the local expansion bus, and to/from the backplane drivers. transfers are synchronous to bpclk.require external pull-ups for correct operation. local activity output . indicates receive activity in this NWK954. connects to all other NWK954s on the local expansion bus. output changes asynchronously. local activity inputs . one input from each NWK954 on the local expansion bus to indicate receive activity. unused inputs must be pulled high or connected directly to digvdd. inputs are sampled on on the rising edge of txclkin. backplane activity output. indicates receive activity on any of the NWK954s on the local expansion bus. drives the backplane through an external driver. only one of the local NWK954s is required to drive this signal, the others should be left unconnected. output changes asynchronously. type analog input analog input analog output analog output analog output analog input analog input analog output analog output analog output analog input analog input analog output analog output analog output analog input analog input analog output analog output analog output pin no. 24 23 31 30 27 41 42 34 35 38 56 55 63 62 59 73 74 66 67 70 type high drive open drain digital output and digital input with pull-up high drive digital output digital input, no pull-up standard digital output pin no. 1 128 127 98 97 2 10 9 8 7 6 105 table 5 continues
NWK954 10 expansion port (continued) signal bpactin_n7 bpactin_n6 bpactin_n5 bpactin_n4 bpactin_n3 bpactin_n2 bpactin_n1 bpdie_n bpdoe_n bpclk bpcol_n bpcolin_n bpcoloe_n type digital input, no pull-up standard digital output and digital input with pull-up standard digital output and digital input with pull-up high drive open drain digital output and digital input with pull-up high drive open drain digital output and digital input with pull-up digital input, no pull-up standard digital output and digital input with pull-up pin no. 89 90 91 92 101 102 103 107 108 96 95 104 106 description backplane activity inputs. indicate activity on up to 7 other hubs connected to the backplane. received from the backplane via external receivers. each NWK954 connected to the local expansion bus receives all of these backplane activity inputs. unused inputs must be pulled high or connected directly to digvdd. inputs are sampled on the rising edge of txclkin. backplane data input enable. enables the external receivers that pass backplane data and clock onto the local ird[4:0] and bpclk lines. only one of the local NWK954s is required to drive this signal, the others should be left unconnected. this signal changes asynchronously. polarity defaults to active low but may be switched to active high by adding an external 10k w pull-down. backplane data output enable. enables the external drivers that pass the local ird[4:0] and bpclk signals onto the backplane. output changes on the rising edge of txclkin. only one of the local NWK954s is required to drive this signal, the others should be left unconnected. polarity defaults to active low but may be switched to active high by adding an external 10k w pull-down. 25mhz backplane clock. data transitions on ird[4:0] are synchronised to this clock. when another hub in the stack is sourcing data, this clock is received from the backplane to all local NWK954s through an external receiver. when a local NWK954 is sourcing data, bpclk is supplied to the backplane through an external driver. requires external pull-up for correct operation backplane collision. this signal may be driven by any of the local NWK954s to indicate that a collision has been detected, and is supplied to the backplane through an external driver. output transitions are synchronous to the rising edge of txclkin and the input is sampled on the rising edge of txclkin. requires external pull-up for correct operation. backplane collision input. indicates that a collision has been detected by any hub in the stack. received from the backplane via an external receiver. connects to all local NWK954s. must be pulled high or connected directly to digvdd if not used. input is sampled on the falling edge of txclkin. backplane collision output enable. enables the external driver that passes bpcol_n onto the backplane. only one of the local NWK954s is required to drive this signal, the others should be left unconnected. output changes on the rising edge of txclkin. polarity defaults to active low but may be switched to active high by adding an external 10k w pull-down. . table 5 (continued)
NWK954 11 led drivers signal colled_n p0_rxled_n p1_rxled_n p2_rxled_n p3_rxled_n p0_erled_n p1_erled_n p2_erled_n p3_erled_n actled_n4 actled_n3 actled_n2 actled_n1 actled_n0 type standard digital output standard digital output standard digital output standard digital output standard digital output standard digital output standard digital output standard digital output standard digital output standard digital outputs pin no. 109 124 122 120 118 123 121 119 117 116 115 114 113 112 description collision led. drives an led to indicate that a collision has occurred either locally or elsewhere in the stack. port 0 activity led. drives an led to indicate link/activity on port 0. the led is turned on when a link is established and flashes off when a packet is being received. port 1 activity led. drives an led to indicate link/activity on port 1. the led is turned on when a link is established and flashes off when a packet is being received. port 2 actlvlty led. drives an led to indicate link/activity on port 2. the led is turned on when a link is established and flashes off when a packet is being received. port 3 activlty led. drives an led to indicate link/activity on port 3. the led is turned on when a link is established and flashes off when a packet is being received. port 0 error led. drives an led to indicate an error on port 0. see the text for a full description. port 1 error led. drives an led to indicate an error on port 1. see the text for a full description. port 2 error led. drives an led to indicate an error on port 2. see the text for a full description. port 3 error led. drives an led to indicate an error on port 3. see the text for a full description. utilization leds. drives 5 leds to indicate utilization of the network segment. see the text for a full description. table 6 clocks and controls signal txclkin reset_n psen0 psen1 ta4 ta3 ta2 type digital input no pull-up open drain digital output and digital input, no pull-up digital inputs with pull-ups digital inputs, no pull-ups pin no. 86 5 87 88 13 14 15 description 25mhz reference clock. supplied from an external source to all NWK954s on the local expansion bus. asynchronous reset. this signal is driven low by the on- chip power-on reset circuit, but may also be driven low externally for manual reset. must be pulled high by an external 5k w resistor. power-savlng enables. 11 enables power-saving on all ports. 01 suppresses power saving on port 0, 10 suppresses power saving on port 3, 00 suppresses power- saving on all ports. scrambler seed. each ot the four phy modules in the NWK954 is provided with a unique scrambler seed derived from ta[4:2]. to ensure that all ot the local phys have unique scrambler seeds, each NWK954 connected to the local expansion bus should have its ta[4:2] input set to a unique value by connecting to digvdd or diggnd. table 7
NWK954 12 power signal diggnd[5: 1] digvdd[5: 1] diggnd6 digvdd6 subvdd[2:1] vrefgnd vrefvdd p0_txgnd[3:1] p0_txvdd[3:2] p0_rxgnd[3:1] p0_rxvdd[3:1] p1_txgnd[3:1] p1_txvdd[3:2] p1_rxgnd[3:1] p1_rxvdd[3:1] p2_txgnd[3:1] p2_txvdd[3:2] p2_rxgnd[3:1] p2_rxvdd[3:1] p3_txgnd[3:1] p3_txvdd[3:2] p3_rxgnd[3:1] p3_rxvdd[3:1] pin no. 94, 100, 111, 126, 4 93, 99, 110, 125, 3 85 84 81, 16 83 82 26, 28, 32 25, 29 17, 20, 21 18, 19,22 39, 37, 33 40, 36 48, 45, 44 47, 46,43 58, 60, 64 57, 61 49, 52, 53 50, 51, 54 71, 69, 65 72, 68 80, 77,76 79, 78, 75 type ground power ground power power ground power ground power ground power ground power ground power ground power ground power ground power ground power description digital ground digital power quiet digital ground quiet digital power substrate power voltage reference ground voltage reference power transmit ground for port 0 transmit power for port 0 receive ground for port 0 receive power for port 0 transmit ground for port 1 transmit power for port 1 receive ground for port 1 receive power for port 1 transmit ground for port 2 transmit power for port 2 receive ground for port 2 receive power for port 2 transmit ground for port 3 transmit power for port 3 receive ground for port 3 receive power for port 3 table 8 no connects signal tdc tdio type factory test factory test table 9 absolute maximum ratings exceeding the absolute maximum ratings may cause permanent damage to the device. extended exposure at these ratings will affect device reliability. supply voltage, v dd input voltage output voltage static discharge voltage storage temperature, t s e 05v to + 70v e 05v to v dd + 05v e 05v to v dd + 05v 4kv hbm e 40 c to +125 c recommended operating conditions neither performance nor reliability are guaranteed outside these limits. extended operation outside these limits may affect device reliability. supply voltage, v dd input voltage output voltage current per pin ambient temperature, t a + 50v 5% 0v to v dd 0v to v dd 100ma 0 c to + 70 c description do not connect to this pin do not connect to this pin pin no. 11 12
NWK954 13 power supply recommended operating conditions apply except where otherwise stated supply voltage supply current characteristic min. typ. max. 525 400 425 v dd i dd v ma value symbol includes current through external components(see fig. 8) conditions units dc electrical characteristics recommended operating conditions apply except where otherwise stated min. typ. max. digital input, no pull-up input high voltage input low voltage hysteresis input high current input low current capacitance digital input, with pull-up input high voltage input low voltage hysteresis input high current input low current capacitance standard digital output output high voltage output low voltage rise time fall time tristate leakage capacitance high drive digital output output high voltage output low voltage rise time fall time tristate leakage capacitance open drain digital output output low voltage fall time tristate leakage capacitance high drive open drain digital output output low voltage fall time tristate leakage capacitance v dd 08 1 e 1 8 v dd 08 1 e 130 8 v dd 04 4 3 1 8 v dd 04 tbd tbd 1 8 04 tbd 1 8 04 tbd 1 8 2 v ss 03 2 v ss 03 e 17 4 v ss e 1 4 v ss e 1 v ss e 1 v ss e 1 v ih v il v h i ih i il c i v ih v il v h i ih i il c i v oh v ol t r t f c o v oh v ol t r t f c o v ol t f c o v ol t f c o including package v il = 0 including package i oh = ? 6ma i ol = 6ma 04v to 24v into 20pf load 24v to 04v into 20pf load including package i oh = ? 24ma i ol = 24ma 04v to 24v into 100pf load 24v to 04v into 100pf load including package i ol = ? 6ma 5v to 04v into 30pf load including package i ol = 24ma 24v to 04v into 100pf load including package v v v m a m a pf v v v m a m a pf v v ns ns m a pf v v ns ns m a pf v ns m a pf v ns m a pf units value conditions characteristic symbol
NWK954 14 ac electrical characteristics recommended operating conditions apply except where otherwise stated txclk and reset_n typ. max. txclkin frequency duty cycle reset_n pulse width 55 - mhz % ns units conditions characteristic value 25 100ppm - f tclk t wres symbol min. 45 100 txop/txon the differential output voltage shall be in the range 950mv to 1050mv. the differential overshoot shall not exceed 5%. overshoot transients must decay to within 1% of the steady state voltage within 8ns of the start of the differential signal transition. the signal amplitude symmetry shall be in the range 98% to 102%. the return loss shall be greater than 16db from 2mhz to 30mhz. the return loss shall be greater than 16-20 log(f/30mhz)db from 30mhz to 60mhz the return loss shall be greater than 10db from 60mhz to 80mhz. the rise and fall times measured from 10% to 90% of the steady state output voltage shall be between 3ns and 5ns. difference between max. and min. rise and fall times shall be less than 05ns. duty cycle distortion must be less than 6 025ns measured at 50% of the steady state output voltage for a data sequence of 01010101 (nrz) total transmit jitter, including duty cycle distortion and baseline wander, must be less than 14ns p-p tp-pmd 9.1.2.2 tp-pmd 9.1.3 tp-pmd 9.1.3 tp-pmd 9.1.4 tp-pmd 9.1.5 tp-pmd 9.1.5 tp-pmd 9.1.5 tp-pmd 9.1.6 tp-pmd 9.1.6 tp-pmd 9.1.8 tp-pmd 9.1.9 reference characteristic rxip/rxin the return loss shall be greater than 16db from 2mhz to 30mhz. the retum loss shall be greater than 16-20 log(f/30mhz)db from 30mhz to 60mhz. the return loss shall be greater than 10db from 60mhz to 80mhz characteristic tp-pmd 9.2.2 tp-pmd 9.2.2 tp-pmd 9.2.2 reference external components (see fig. 8) component description value tol. 1% 1% 1% 1% 5% 5% 5% receiver impedance matching resistor network. receiver impedance matching resistor network. transmitter load resistors. sets the transmitter output current. this resistor is required even if the reset_n signal is not used externally. optional pull-downs on backplane enable signals. these outputs are normally active low. each output can be independently changed to active high by the addition of this resistor. pull-ups required on open drain expansion port outputs. series resistors. may be required in some applications where the expansion ports are used.* r1 r2 r3 r4 r5 r6 r7 r8 c1, c3 c2 162 w 340 w 50 w 12k w 5k w 10k w 200 w min* 001 m f 01 m f * refer to mitel table 10
NWK954 15 fig. 8 external components 1:1 magnetics valor st6184 bel 5558-5999-74 rxon3 rxop3 rxoc3 txip3 txin3 txic3 txic2 txin2 txip2 rxoc2 rxop2 rxon2 rxon1 rxop1 rxoc1 txip1 txin1 txic1 txic0 txin0 txip0 rxoc0 rxop0 rxon0 c1 c2 r2 r1 r2 r1 r2 r1 r2 r1 c1 c2 c3 c3 r3 r3 r3 r3 c1 c2 r2 r1 r2 r1 c3 c3 r3 r3 r3 r3 c1 c2 r2 r1 r2 r1 p3_rxin p3_rxip p3_txref p3_txgnd2 p3_txon p3_txop r4 p2_txop p2_txon p2_txref p3_txgnd2 p2_rxip p2_rxin 74 73 70 69 67 66 63 62 56 55 42 41 34 p1_rxin p1_rxip p1_txref p1_txgnd2 p1_txon p1_txop p0_txop p0_txon p0_txref p0_txgnd2 p0_rxip p0_rxin 31 30 24 23 bpdoe_n bpdie_n bpcoloe_n NWK954 reset_n ird0 97 ird1 98 ird2 127 r7 ird3 128 r7 ird4 1 r7 bpclk 96 r7 bpcol_n 95 r4 59 60 r8 r8 r8 r8 r4 37 38 r6 r6 r6 108 107 106 r5 5 r4 27 28 r7 r7 r7 r8 r8 r8 =v dd 35 for further details on magnetics please refer to vendor.

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