CT2565-201-2 데이터 시트보기 (PDF) - Aeroflex Corporation

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CT2565-201-2

Bus Controller, Remote Terminal and BUS Monitor

Aeroflex Corporation 

Use of Status Word

The status word may be captured by the

subsystem as it is transmitted to the 1553 port by

pulsing BUFENA (pin 58) low during STATEN (pin

3: 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.

PIN

#

SYMBOL

DESCRIPTION

6 DBACCEPT RT accepts BC operation

responsibility (See Table 2).

7 SSFLAG

Transmitted data may be

invalid sets SSFLAG bit.

8 SVCREQ

Service Request; see

Transmit Vector mode

command.

10 SSER

RTU fault exists: sets

TERMINAL FLAG bit.

47 SSBUSY

Subsystem cannot service

1553 request at this time.

48 ILLCMD

Mode command subsystem

illegalization: Sets MSGERR

bit, doesn’t suppress status

word.

Table 7 – Subsystem Control of RT-Status

1553 BUS CMD RTA RCV P DATA (16 BITS) P

NRGRNT (42)

BCSTRCV (75)

INCMD (9)

HANDSHAKE

(REQ, GRNT, ACK)

1.5µs

3.4±0.5µs

0.5µs

3.2±0.5µs

REF

10.75±0.75µs

7.5±0.5µs

3.9µs

STAT RTA

5.5±0.5µs

P

7.5±0.5µs

4.5±0.5µs

SOM (78)

MEM-WRITE

(CS, WR, ADRINC)

D0 - D15

NODT (71)

STATEN (3)/

BUFFENA (58)

EOM (57)

WC0-4 T/R (15)

CHA/CHB (16)

Aeroflex Circuit Technology

5.5±0.5µs

CMD

667ns

DATA

STAT

4µs

400ns

166ns

Note: All timing is typical unless otherwise noted.

Figure 16 – RT Receive Command Timing

16

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

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