ACT3492 datasheet(13/49 Pages) AEROFLEX

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SCD3492 REV B 6/26/01 Plainview NY (516) 694-6700

TX/RX

OUTPUT

H10

Transmit/Receive - The state of this line informs the subsystem

whether it is to transmit or receive data. The signal is valid while

INCMD is low.

INCMD

OUTPUT

In Command - Goes low when the RT is servicing a valid

command. The subaddress and word count lines are valid while

the signal is low.

WC0-WC4

OUTPUT

B7,C8

A6,B6

Word Count - These five lines specify the requested number of

data words to be received or transmitted. Valid when INCMD is

low.

SA0-SA4

OUTPUT

J10,K8

H7,K3

Sub Address - These five lines are a label for the data being

transferred. Valid when INCMD is low.

CWC0-CWC4

OUTPUT

H4,H8

K4,J8

Current Word Count - These five lines define which data word

in the message is currently being transferred.

SYNC

OUTPUT

Synchronize - Goes low when a synchronize mode code is

being serviced.

VECTEN/DWEN

OUTPUT

Vector Word Enable/DataWord Enable - In the RT mode, this

signal is provided to enable the contents of the vector word latch

(which is situated in the subsystem) onto the ASIC’s internal

highway. This signal, when in the Bus Controller mode, is used

to enable mode code data from the subsystem onto the internal

highway.

RESET

OUTPUT

Reset - This line pulses low for 500ns on completion of the ser-

vicing of a valid and legal mode command to reset remote ter-

minal.

SSERR

INPUT

Subsystem Error - By taking this line low, the subsystem can

set the Subsystem Flag in the Status Word.

BUSY

INPUT

Busy - This signal should be driven low if the subsystem is not

ready to perform a data transfer to or from the ASIC.

SERVREQ

INPUT

Service Request - This signal should be driven low to request

an asynchronous transfer and left low until the transfer has

taken place.

INCLK

OUTPUT

G10

Internal Clock (2 MHz) - This is made available for

synchronization use by the subsystem if required. However,

many of the outputs to the subsystem are asynchronous.

EOT

OUTPUT

End of Transmission - Goes low if a valid sync plus two data

bits do not appear in time to be contiguous with preceding word.

RTADER

OUTPUT

Remote Terminal Address Error - This line goes low if an error

is detected in the RT address parity of the selected receiver.

Any receiver detecting an error in the RT address will turn itself

off.

Pin Description (Cont.)

Signal

Direction

Signal Description

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