CT2565 datasheet(16/31 Pages) AEROFLEX

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SCDCT2565 REV B 8/10/99 Plainview NY (516) 694-6700

Figure 16 – RT Receive Command Timing

EOM (57)

NRGRNT (42)

INCMD (9)

D0 - D15

(REQ, GRNT, ACK)

HANDSHAKE

BCSTRCV (75)

1553 BUS

NODT (71)

(CS, WR, ADRINC)

MEM-WRITE

STAT

RTA

CMD RTA

RCV P DATA

(16 BITS)

3.9µs

10.75±0.75µs

Note: All timing is typical unless otherwise noted.

SOM (78)

STATEN (3)/

BUFFENA (58)

CHA/CHB (16)

WC0-4 T/R (15)

REF

7.5±0.5µs

5.5±0.5µs

4.5±0.5µs

7.5±0.5µs

3.4±0.5µs

0.5µs

1.5µs

3.2±0.5µs

5.5±0.5µs

4µs

400ns

667ns

166ns

CMD

DATA

STAT

Use of Status Word

The

status

word

may

captured

the

subsystem as it is transmitted to the 1553 port by

pulsing BUFENA (pin 58) low during STATEN (pin

520ns low pulse).

Data becomes valid

approximately 50ns after the falling edge of

BUFENA.

This

corresponds

with

all

non-broadcast

message

transfers

and

the

TRANSMIT STATUS WORD mode command.

Note that the status word may be transmitted prior

to an error condition (See Transmit CMD). These

conditions will be indicated in the "next" status

word and may be monitored if the BC requests the

SW before it is altered (See Mode Commands).

Subsystem Control

The CT2565 allows the subsystem total control

over the status word flags using the inputs

indicated in Table 7.

BIT Word

The BIT Word (Built-In-Test) becomes available in

response to a TRANSMIT BIT WORD mode

command

and

provides

additional

status

information (See Figure 19) to that provided by the

status word. The subsystem may capture the BIT

word on the parallel data bus by pulsing BUFENA

(pin 58) low during BITEN (pin 43: approximately

520ns

low

pulse).

Data

Becomes

valid

approximately 50ns after the falling edge of

BUFENA.

Like the status word, the BIT word

cannot be altered by the subsystem.

SYMBOL

DESCRIPTION

DBACCEPT

RT accepts BC operation

responsibility (See Table 2).

SSFLAG

Transmitted data may be

invalid sets SSFLAG bit.

SVCREQ

Service Request; see

Transmit Vector mode

command.

SSER

RTU fault exists: sets

TERMINAL FLAG bit.

SSBUSY

Subsystem cannot service

1553 request at this time.

ILLCMD

Mode command subsystem

illegalization: Sets MSGERR

bit, doesn’t suppress status

word.

Table 7 – Subsystem Control of RT-Status

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