CT1990 Ver la hoja de datos (PDF) - Aeroflex Corporation

Número de pieza

componentes Descripción

Fabricante

CT1990

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

Aeroflex Corporation 

Pin Description (Cont.)

Signal

Direction

NBGT

OUTPUT

MEREQ

INPUT

TX/RX

OUTPUT

INCMD

OUTPUT

WC0-WC4

OUTPUT

SA0-SA4

OUTPUT

CWC0-CWC4

OUTPUT

SYNC

VECTEN/DWEN

OUTPUT

OUTPUT

RESET

SSERR

BUSY

SERVREQ

INCLK

OUTPUT

INPUT

INPUT

INPUT

OUTPUT

EOT

RTADER

OUTPUT

OUTPUT

HSFAIL

OUTPUT

LSTCMD/CWEN

OUTPUT

Signal Description

New Bus Grant - Pulses low whenever a new command is accepted by the

ASIC.

Message Error Request - Positive-going edge will cause Message Error Bit in

Status Word to be set.

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.

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.

Word Count - These five lines specify the requested number of data words to

be received or transmitted. Valid when INCMD is low.

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

when INCMD is low.

Current Word Count - These five lines define which data word in the message

is currently being transferred.

Synchronize - Goes low when a synchronize mode code is being serviced.

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 - This line pulses low for 500ns on completion of the servicing of a valid

and legal mode command to reset remote terminal.

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

Subsystem Flag in the Status Word.

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

perform a data transfer to or from the ASIC.

Service Request - This signal should be driven low to request an

asynchronous transfer and left low until the transfer has taken place.

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.

End of Transmission - Goes low if a valid sync plus two data bits do not

appear in time to be contiguous with preceding word.

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.

Handshake Failure - This line pulses low if the allowable time for DTAK

response has been exceeded during the ASIC/subsystem data transfer

handshaking.

Last Command/Command Word Enable - This line pulses low when

servicing a valid and legal mode command to transmit last command. When in

RT mode this line must not be used to enable data from the subsystem. This

line also pulses low, when in the Bus Control mode, when a command word is

required for transmission.

Aeroflex Circuit Technology

11

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

Share Link: