Aeroflex Circuit Technology

4

SCDCT2561 REV A 8/16/99 Plainview NY (516) 694-6700

29

LWORD

-

Last word output during BC mode indicates last data word of the current

message transfer has been transferred on the parallel bus.

30

MSGERR

O

Output signal which indicates an error occurred during the current message

sequence.

31

TXDATA A

O

Bipolar serial data output to positive input of bus transceiver.

32

RXDATA A

I

Bipolar serial input from negative output of bus transceiver.

33

RTADP

I

Parity bit input for RT address.

34

RTAD1

I

Bit 1 of RT address input.

35

RTAD3

I

Bit 3 of RT address input.

36

RESET

I

System reset input - resets all inputs in module.

37

TXDATA B

O

Bipolar serial data output to negative input bus transceiver.

38

RXDATA B

I

Bipolar serial data input from positive output of bus transceiver.

39

16MHz

I

16MHz TTL clock input.

40

GROUND

-

Signal ground.

41

BCSTART

I

Cycle enable input Logic "0" initiates bus controller message transfer operation.

42

NBGRNT

O

New bus grant output from RT indicates beginning of message transfer

sequence.

43

BITEN

O

Built in Test enable output indicates RT is transferring BlT word on internal 16 bit

bus.

44

WR

O

Write enable output for control of subsystem memory.

45

BUSGRNT

I

Bus request input in response to DTREQ. Allows BC/RT to transfer data to

subsystem.

46

LOOPERR

O

Loop error output. Logic "0" indicates failure of loop back transmitted data.

47

SSBUSY

I

Subsystem busy input for RT status word.

48

ILLCMD

I

Illegal command input to RT, used to block RT response to an illegal command.

49

ADRINC

O

Increment output pulse. Goes LOW at the completion of each word transfer

to/from subsystem. Can increment external address counter.

50

CHASSIS

-

Frame ground electricity isolated from signal ground

51

WC0

O

LSB of current command word count field.

52

WC2

O

Bit 2 of word count field.

53

WC4

O

Bit 4 of word count field.

54

TXINH A

O

Transmitter inhibit output signal for Channel A.

55

LMC

O

Latched Mode Command. Logic "1" indicates current word command is a mode

code word, WC0-WC4.

56

TESTIN

-

Factory test point. Do not connect.

Table 1A – Pin Function Table (78 Pin Plug-In) (continued)

Pin #

Symbol

I/O

Description