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NWK954
User Manual
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Mitel NWK954 User Manual

NWK954
QUAD FAST ETHERNET REPEATER
PRELIMINARY INFORMATION
Supersedes January 1998 version, DS4842 - 1.1 DS4842-2.1 April 1998
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.
The NWK954 is supplied in a 128-pin PQFP and interfaces to the twisted pair media through 1:1 isolation transformers.
ORDERING INFORMATION
NWK954D/CG/GH1N
FEATURES
■ Compliant with IEEE 802.3 100BASE-TX Repeater Unit Specification
■ Incorporates four IEEE 802.3 Compliant 100BASE-TX Ports
■ Local Expansion Port for Cascading to 24 Ports
■ Stackable Backplane for Expansion up to 192 Ports
■ Link/Activity LED and Receive Error LED for each Port
■ Collision LED
■ Five LED Network Utilization Display
■ Base Line Wander Correction
■ Power Saving on Unused Ports
■ Driven from a Single 25MHz Clock
■ Single 5V supply
■ Low Power CMOS Technology
■ 128-pin PQFP package
OSCILLATOR
BACKPLANE CONTROLS
NWK954
QUAD
MAGNETICS
QUAD RJ45
LOCAL EXPANSION BUS
NWK954
QUAD
MAGNETICS
BACKPLANE BUFFERS
NWK954
QUAD
MAGNETICS
Fig. 1 System block diagram
NWK954
QUAD
MAGNETICS
CLOCK DRIVERS
NWK954
QUAD
MAGNETICS
NWK954
QUAD
MAGNETICS
NWK954
Hub 7
Hub 6
Hub 5
Hub 4
Hub 3
Hub 2
Hub 1
Hub 0
BACKPLANE CONTROLS
LOCAL EXPANSION BUS
BACKPLANE BUFFERS
OSCILLATOR
CLOCK DRIVERS
NWK954
QUAD
MAGNETICS
QUAD RJ45
NWK954
QUAD
MAGNETICS
NWK954
QUAD
MAGNETICS
NWK954
QUAD
MAGNETICS
NWK954
QUAD
MAGNETICS
NWK954
QUAD
MAGNETICS
Fig. 2 192-port stacked repeater
2
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
NWK954
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
119
118
117
116
128
127
126
125
124
123
122
121
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
33343536373839404142434445464748495051525354555657585960516263
120
115
NWK954
111
114
113
112
110
109
108
107
106
105
104
103
102
101
100
999897
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
64
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–RXVDD1 P3_RXIN P3_RXIP P3_TXVDD3 P3_TXGND3 P3_TXREF P3_TXGND2 P3_TXVDD2 P3_TXON P3_TXOP P3_TXGND1
P1_RXIP
P1_TXOP
P1_TXON
P1_TXVDD2
P1_TXGND1
P1_TXREF
P1_TXGND2
P1_RXIN
P1_TXVDD3
P1_TXGND3
P1_RXVDD1
P1_RXGND1
P1_RXGND2
Fig. 3 Pin connections – top view
FUNCTIONAL DESCRIPTION Overvlew
The NWK954 is a mixed-signal CMOS device which integrates all of the functions required for an unmanaged 4­port 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.
P2_RXIP
P1_RXVDD2
P1_RXVDD3
P1_RXGND3
P2_RXGND3
P2_RXVDD3
P2_RXVDD2
P2_RXGND2
P2_RXGND1
P2_RXIN
P2_TXVDD3
P2_RXVDD1
P2_TXREF
P2_TXGND3
P2_TXOP
P2_TXON
P2_TXVDD2
P2_TXGND2
P2_TXGND1
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
3
NWK954
LACTOUT_N
BPACTOUT_N
BPACTIN_ N [7:1]
BPCOLIN_N
BPCOLOE_N
ACTLED_N [4:0]
P0_RXLED_N P0_ERLED_N P1_RXLED_N P1_ERLED_N P2_RXLED_N P2_ERLED_N P3_RXLED_N P3_ERLED_N
IRD [4:0]
LACTIN_N
BPDIE_N
BPDOE_N
BPCLK
BPCOL_N
COLLED_N
EXPANSION
PORT
LED
DRIVERS
REPEATER
CONTROLLER
PORT 0
TRANSCEIVER
PORT 1
TRANSCEIVER
PORT 2
TRANSCEIVER
PORT 3
TRANSCEIVER
P0_TXOP P0_TXON P0_TXREF P0_RXIP P0_RXIN
P1_TXOP P1_TXON P1_TXREF P1_RXIP P1_RXIN
P2_TXOP P2_TXON P2_TXREF P2_RXIP P2_RXIN
P3_TXOP P3_TXON P3_TXREF P3_RXIP P3_RXIN
VOLTAGE
REFERENCE
TX DRIVER
RX SIGNAL
DETECT
TRANSCEIVER
CONTROL
SCRAMBLER
DESCRAMBLER
LINE
MONITOR
SIPO AND
DECODER
POWER-ON
RESET
125MHz
SYNTHESIZER
RESET_N
CLOCK
RECOVERY
TA [4:2]
TXCLKIN
PSEN [1:0]
PISO
AND
ENCODER
EQUALIZER
AND BLW
CORRECTION
Port [3:0] transceiver details
Fig. 4 NWK954 block diagram
4
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.
BPACTIN_ N [7:1]
5
LACTIN_N [5:1] LACTOUT_N BPCOLIN_N BPCOL_N BPCLK
5
IRD [4:0]
NWK954
TXCLKIN
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
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]
5
LACTIN_N [5:1] LACTOUT_N BPCOLIN_N BPCOL_N BPCLK
5
IRD [4:0]
BPACTIN_ N [7:1]
5
LACTIN_N [5:1] LACTOUT_N BPCOLIN_N BPCOL_N BPCLK
5
IRD [4:0]
BPACTIN_ N [7:1]
5
LACTIN_N [5:1] LACTOUT_N BPCOLIN_N BPCOL_N BPCLK
5
IRD [4:0]
BPACTIN_ N [7:1]
5
LACTIN_N [5:1] LACTOUT_N BPCOLIN_N BPCOL_N BPCLK
5
IRD [4:0]
BPACTIN_ N [7:1]
5
LACTIN_N [5:1] LACTOUT_N BPCOLIN_N BPCOL_N BPCLK
5
IRD [4:0]
TXCLKIN
TXCLKIN
TXCLKIN
TXCLKIN
TXCLKIN
Fig. 5 Cascaded NWK954s
CLOCK
DRIVER
25MHz
OSCILLATOR
5
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