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Supersedes January 1998 version, DS4842 - 1.1
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.
ORDERING INFORMATION
NWK954D/CG/GH1N
BACKPLANE CONTROLS
LOCAL EXPANSION BUS
NWK954
QUAD
MAGNETICS
QUAD RJ45
NWK954
NWK954
QUAD
QUAD
MAGNETICS
MAGNETICS
Fig. 1 System block diagram
QUAD FAST ETHERNET REPEATER
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
BACKPLANE BUFFERS
NWK954
QUAD
MAGNETICS
NWK954
PRELIMINARY INFORMATION
DS4842-2.1 April 1998
OSCILLATOR
CLOCK DRIVERS
NWK954
NWK954
QUAD
QUAD
MAGNETICS
MAGNETICS
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Table of Contents
Summary of Contents for Mitel NWK954
- Page 1 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 FEATURES Ethernet Repeater conforming to the IEEE 802.3 100BASE-TX Compliant with IEEE 802.3 100BASE-TX Repeater Standard.
- Page 2 NWK954 Hub 7 Hub 6 Hub 5 Hub 4 Hub 3 Hub 2 Hub 1 Hub 0 OSCILLATOR BACKPLANE CONTROLS BACKPLANE BUFFERS CLOCK DRIVERS LOCAL EXPANSION BUS NWK954 NWK954 NWK954 NWK954 NWK954 NWK954 QUAD QUAD QUAD QUAD QUAD QUAD MAGNETICS MAGNETICS MAGNETICS MAGNETICS...
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Page 3: Functional Description
NWK954 IRD4 BPCLK LACTOUT_N BPCOL_N DIGVDD1 DIGGND5 DIGGND1 DIGVDD5 RESET_N BPACTIN_N4 LACTIN_N1 BPACTIN_N5 LACTIN_N2 BPACTIN_N6 LACTIN_N3 BPACTIN_N7 LACTIN_N4 PSEN0 LACTIN_N5 PSEN1 TXCLKIN TDIO DIGGND6 DIGVDD6 VREFGND VREFVDD SUBVDD1 SUBVDD2 P0_RXGND3 P3_RXGND3 P0_RXVDD3 P3_RXVDD3 P0_RXVDD2 P3_RXVDD2 NWK954 P0_RXGND2 P3_RXGND2 P0_RXGND1 P3_RXGND1 P0_RXVDD1 P3–RXVDD1 P0_RXIN... - Page 4 NWK954 P0_TXOP P0_TXON IRD [4:0] P0_TXREF PORT 0 LACTOUT_N TRANSCEIVER P0_RXIP LACTIN_N P0_RXIN BPACTOUT_N BPACTIN_ N [7:1] EXPANSION BPDIE_N PORT BPDOE_N P1_TXOP BPCLK P1_TXON BPCOL_N P1_TXREF PORT 1 BPCOLIN_N TRANSCEIVER P1_RXIP BPCOLOE_N P1_RXIN REPEATER CONTROLLER P2_TXOP P2_TXON P2_TXREF ACTLED_N [4:0] PORT 2 TRANSCEIVER P2_RXIP...
- Page 5 The Expansion Port allows hubs to be stacked via a backplane OSCILLATOR 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 Fig. 5 Cascaded NWK954s components.
- Page 6 NWK954 BPACTIN_ N [7:1] LACTIN_N [5:1] LACTOUT_N BPCOLIN_N TXCLKIN BPCOL_N BPCLK IRD [4:0] BPACTIN_ N [7:1] LACTIN_N [5:1] LACTOUT_N BPCOLIN_N TXCLKIN BPCOL_N BPCLK IRD [4:0] BPACTIN_ N [7:1] LACTIN_N [5:1] LACTOUT_N BPCOLIN_N TXCLKIN BPCOL_N BPCLK IRD [4:0] BACKPLANE DATA BPACTIN_ N [7:1] LACTIN_N [5:1] LACTOUT_N BPCOLIN_N...
- Page 7 NWK954 The IRD bus in each hub is connected to the 5-bit backplane LED Drivers bus via a bidirectional buffer. This allows data to be driven from The NWK954 provides 2 LED drivers per port to indicate any hub to all other hubs in the stack. The bidirectional buffer is port status (RXLED_N and ERLED_N), one LED driver to controlled by 2 control signals (BPDOE_N and BPDIE_N) which indicate collisions (COLLED_N) and 5 LED drivers to indicate...
- Page 8 NWK954 100BASE-TX Receiver 100BASE-TX Transmitter The 100BASE-TX receiver recovers data from up to 140m The 100BASE-TX transmitter generates a 125MHz transmit of Cat5 UTP cable. Received data is decoded and descrambled clock and uses it to serialize and transmit the 5-bit symbol data and presented to the repeater controller as 5-bit symbols.
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Page 9: Pin Descriptions
NWK954 PIN DESCRIPTIONS Active low signals are denoted by the _N suffix; all other signals are active high Network Interface Signal Pin no. Type Description P0_RXIP Analog input (1) Differential receive signal from port 0 magnetics P0_RXIN Analog input (2) Differential receive signal from port 0 magnetics P0_TXOP Analog output (1) Differential transmit signal to port 0 magnetics... - Page 10 NWK954 Expansion Port (Continued) Signal Pin no. Type Description BPACTIN_N7 Digital input, Backplane activity inputs. Indicate activity on up to 7 BPACTIN_N6 no pull-up other hubs connected to the backplane. Received from the BPACTIN_N5 backplane via external receivers. Each NWK954 BPACTIN_N4 connected to the local expansion bus receives all of these BPACTIN_N3...
- Page 11 NWK954 LED Drivers Signal Pin no. Type Description COLLED_N Standard Collision LED. Drives an LED to indicate that a collision digital output has occurred either locally or elsewhere in the stack. P0_RXLED_N Standard Port 0 activity LED. Drives an LED to indicate link/activity digital output on port 0.
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Page 12: Absolute Maximum Ratings
NWK954 Power Signal Pin no. Type Description DIGGND[5: 1] 94, 100, 111, 126, 4 Ground Digital ground DIGVDD[5: 1] 93, 99, 110, 125, 3 Power Digital power DIGGND6 Ground Quiet digital ground DIGVDD6 Power Quiet digital power SUBVDD[2:1] 81, 16 Power Substrate power VREFGND... -
Page 13: Power Supply
NWK954 POWER SUPPLY Recommended Operating Conditions apply except where otherwise stated Value Characteristic Symbol Units Conditions Min. Typ. Max. Supply voltage 4·25 5·25 Supply current Includes current through external components(see Fig. 8) DC ELECTRICAL CHARACTERISTICS Recommended Operating Conditions apply except where otherwise stated Value Units Characteristic... -
Page 14: Ac Electrical Characteristics
Each output can be independently changed to active high by the addition of this resistor. 200 min* Pull-ups required on open drain expansion port outputs. Series resistors. May be required in some applications where the expansion ports are used.* C1, C3 0·01 F 0·1 F * Refer to Mitel Table 10... - Page 15 NWK954 =V DD RXON3 P3_RXIN P3_TXREF RXOP3 P3_RXIP P3_TXGND2 RXOC3 P2_TXREF P3_TXON TXIP3 P3_TXGND2 P3_TXOP TXIN3 P1_TXGND2 TXIC3 P1_TXREF TXIC2 P0_TXREF P2_TXOP TXIN2 P0_TXGND2 P2_TXON TXIP2 BPDOE_N RXOC2 BPDIE_N P2_RXIP MAGNETICS RXOP2 BPCOLOE_N P2_RXIN RXON2 VALOR NWK954 ST6184 RXON1 P1_RXIN RXOP1 RESET_N P1_RXIP...
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Page 16: Package Details
Swindon Tel: (01793) 726666 Fax : (01793) 518582 These are supported by Agents and Distributors in major countries world-wide. © Mitel Corporation 1998 Publication No. DS4842 Issue No. 2.1 April 1998 TECHNICAL DOCUMENTATION – NOT FOR RESALE. PRINTED IN UNITED KINGDOM This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned.