ACT3492 datasheet(15/49 Pages) AEROFLEX

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

PASMON

INPUT

Passive Monitor - When functioning as a Bus Controller this

line acts as a passive monitor select. The active going edge of

this line will cause the REQBUS lines to be latched and that

bus, now selected will be monitored so long as PASMON

remains low. All traffic on the bus will be handed, after

validation, to the subsystem via STATSTB for status and

commands words, and RMDSTB for data words.

BCOPSTB

INPUT

Bus Controller Operation Strobe - When functioning as a Bus

Controller a low going pulse on this line will initiate the selected

bus controller operation on the requested bus, using BCOPA&B

and REQBUSA&B.

BCOPA

INPUT

B10

Bus Control Operation A - Least significant bit of the bus

controller operation select lines.

BCOPB

INPUT

C10

Bus Control Operation B - Most significant bit of the bus

controller operation select lines.

REQBUS A

BIDIR

Request Bus A - This line, when in RT mode, is the least

significant bit of the bus request lines which specify the origin of

the command, i.e. they are sources. When in BC mode these

lines are sinks and specify which bus is to be used for the next

command.

REQBUS B

BIDIR

Request Bus B - Most significant bit of the bus request lines.

(See above for description.)

RT/BC

INPUT

Remote Terminal/Bus Control - This line when high causes

the ASIC to function as a remote terminal. When low the ASIC

functions as a bus controller or passive monitor.

DBCACC

INPUT

Dynamic Bus Control Accept - This line should be

permanently tied low if a subsystem is able to accept control of

the bus if offered.

LTFAIL

OUTPUT

Loop Test Fail - This line goes low if any error in the transmitted

waveform is detected or if any parity error in the hardwired RT

address is detected.

ERROR

OUTPUT

Error - This line latches low if a Manchester or parity error is

detected. It is reset by the next CMSYNC (RT mode) and also

by RTO in the BC mode.

RTO

OUTPUT

Reply Time Out - This signal will pulse low whenever the reply

time for a transmitting terminal has been exceeded. This line is

intended for the bus controller use.

TXTO

OUTPUT

Transmitter Time Out - This line latches low if the transmitter

time out limits are exceeded.

PARER

OUTPUT

Parity Error - This line will pulse low if a parity error is detected

by the decoder.

Pin Description (Cont.)

Signal

Direction

Signal Description

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