CT1995 datasheet(8/25 Pages) AEROFLEX

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Aeroflex Circuit Technology

SCDCT1995 REV A 11/21/01 Plainview NY (516) 694-6700

SA 0-4

SOURCE

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

when INCMD is low.

CWC 0-4

SOURCE

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

is currently being transferred.

SYNC

SOURCE

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

VECTEN/DWEN

SOURCE

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

SOURCE

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

and legal mode command to reset remote terminal.

SSERR

SINK

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

Subsystem Flag in the Status Word.

BUSY

SINK

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

perform a data transfer to or from the ASIC.

SERVREQ

SINK

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

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

INCLK

SOURCE

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

SOURCE

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

SOURCE

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.

HSFAIL

SOURCE

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

response has been exceeded during the ASIC/subsystem data transfer

handshaking.

LSTCMD/CWEN

SOURCE

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.

STATEN/

STATSTB

SOURCE

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.

BITEN/

RMDSTB

SOURCE

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.

Pin Description (Cont.)

Signal

Hybrid

Sink or Source

Signal Description

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