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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