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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
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