CT2565 datasheet(25/31 Pages) AEROFLEX

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SCDCT2565 REV B 8/10/99 Plainview NY (516) 694-6700

Table 9A – Pin Function Table (78 Pin DDIP)

Pin #

Symbol

Description

RT/BC

Mode Select input - logic "1" for RT mode, logic “0” for BC mode.

Monitor mode enable. When unit is operating as a BC, a logic “0” will select monitor

mode.

STATEN

Output signal in RT mode that indicates status word is being transferred on the

internal bus.

TIMEOUT

Indicates No Response Timeout has occured during BC and RTU (RT to RT transfer).

HSFAIL

Output in RT mode indicating the DMA transfer did not occur in time to allow proper

operation on the 1553 bus.

DBACCEPT

Input signal used to set DBACCEPT bit in status register for response to a valid mode

command on the 1553 bus.

SSFLAG

Input which controls the SSFLAG bit in the status register.

SVCREQ

Input which controls the service request bit in the status word.

INCMD

Output signal indicating the RT is currently in a message transfer sequence.

SSER

Input which controls the subsystem error bit in the status register.

TESTOUT

Factory test point. Do not connect.

WC1

WC bit 1 - latched output of command word.

WC3

WC bit 3 - latched output of command word.

TXINH B

Transmitter inhibit output for channel B.

T/R

Output indicating T/R bit of current command word in RT mode.

CHA/CHB

Output indicating current selected channel (0 = Channel A).

Chip Select output for subsystem memory control.

Output Enable output for subsystem memory control.

BUSREQ

Output signal used to initiate transfer to/from subsystem.

+5V

+5 Volt DC input.

DB0

Least significant bit - 16 bit parallel data bus.

DB2

Bit 2 of data bus.

DB4

Bit 4 of data bus.

DB6

Bit 6 of data bus.

DB8

Bit 8 of data bus.

DB10

Bit 10 of data bus.

DB12

Bit 12 of data bus.

DB14

Bit 14 of data bus.

LWORD

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

transfer has been transferred on the parallel bus.

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