NWK954
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
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
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
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
NWK954
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
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_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
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
GP128
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 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.
3
MITEL [ MITEL NETWORKS CORPORATION ]
