CT1990 查看數據表（PDF） - Aeroflex Corporation

零件编号

产品描述 (功能)

生产厂家

CT1990

MIL-STD-1553B Remote Terminal, Bus Controller, or Passive Monitor Hybrid with Status Word Control

Aeroflex Corporation 

Pin Description (Cont.)

Signal

Direction

Signal Description

STATEN/

STATSTB

STAT UPDATE

BITEN/

RMDSTB

DWSYNC

ENABLE

CMSYNC

NDRQ

NEXT STAT

PASMON

BCOPSTB

RMDSTB

BCOPA

BCOPB

REQBUS A

REQBUS B

OUTPUT

INPUT

OUTPUT

OUTPUT

INPUT

OUTPUT

OUTPUT

INPUT

INPUT

INPUT

INPUT

INPUT

BI-DIRECTIONAL

BI-DIRECTIONAL

Status Enable/Status Strobe - This line pulses low to enable the status word

onto the internal highway for transmission. When in RT mode this line must not

be used to enable data from the subsystem. This line also pulses high, when in

the Bus Control mode, to strobe received status words into the subsystem.

When PASMON is true this line pulses high for Command and Status words.

Status Update - When held low, causes TF or SSF to appear in Status Word

response to Transmit Status or Transmit Last Command issued immediately

after fault occurrence

Built In Test Enable/Receive Mode Data Strobe - This line pulses low when

servicing a valid and legal mode command to transmit the internal BIT word.

This signal is for information only and must not be used to enable data from the

subsystem. This line also pulses high when in the Bus Control mode when

mode data is received to be passed to the subsystem and when data is passed

to the subsystem during PASMON.

Data Word Sync - This line goes low if a data word sync and two Manchester

biphase bits are valid. CT1990 only.

Enable - When held low, enables Bit Decode, Next Status, and Status Update

program lines.

Command Word Sync - This line goes low if a command word sync and two

Manchester biphase bits are valid. CT1990 only.

No Data Required - This line goes low if the encoder transmit buffer is full i.e.

another word is going to be transmitted. This signal is for information only and

must not be used to enable data from the subsystem.

Next Status - When held low, causes TF or SSF to appear in very next Status

Word after fault occurrence (except for Transmit Status or Transmit Last Com-

mand).

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.

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.

See BITEN/RMDSTB.

Bus Control Operation A - Least significant bit of the bus controller operation

select lines.

Bus Control Operation B - Most significant bit of the bus controller operation

select lines.

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.

Request Bus B - Most significant bit of the bus request lines. (See above for

description.)

Aeroflex Circuit Technology

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SCDCT1990 REV B 8/21/00 Plainview NY (516) 694-6700

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