Functional Description - Mitel NWK954 Manual

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

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.
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Fig. 3 Pin connections – top view
NWK954
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.
NWK954
96 BPCLK
95 BPCOL_N
94 DIGGND5
93 DIGVDD5
92 BPACTIN_N4
91 BPACTIN_N5
90 BPACTIN_N6
89 BPACTIN_N7
88 PSEN0
87 PSEN1
86 TXCLKIN
85 DIGGND6
84 DIGVDD6
83 VREFGND
82 VREFVDD
81 SUBVDD2
80 P3_RXGND3
79 P3_RXVDD3
78 P3_RXVDD2
77 P3_RXGND2
76 P3_RXGND1
75 P3–RXVDD1
74 P3_RXIN
73 P3_RXIP
72 P3_TXVDD3
71 P3_TXGND3
70 P3_TXREF
69 P3_TXGND2
68 P3_TXVDD2
67 P3_TXON
66 P3_TXOP
65 P3_TXGND1
GP128
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