CT2565 datasheet(20/31 Pages) AEROFLEX

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

Simultaneous Transmission

Transmissions

appearing

simultaneously

alternate 1553-bus channels will be captured by

CT2565

sequentially

providing

that

each

BUSREQ is answered by the subsystem with a

BUSGRNT within the handshake timeout period.

RESET Signal

Pulsing RESET low will suspend MT operation by

(1) INCMD goes high (EOM goes low on the rising

edge) and (2) the CT2565 enters an idle state.

operation

may

restored

pulsing

BCSTART low (above) or another mode of

operation may be selected (See Table 2).

Handshake Failure

Note that a handshake failure will abort the

current transfer.

Monitoring will resume upon

receipt of a valid word on the 1553 bus.

MODE CODES

Nine of the 13 available, dual redundant mode

codes are handled by the CT2565 without user

intervention.

Of the four remaining codes,

Dynamic Bus Control and Synchronize (no data)

require subsystem notification.

The remaining

two mode codes, Transmit Vector Word and

Synchronize (with data) involve data transfer with

the subsystem. Mode command illegalization and

handling are detailed in the RTU Operation

section and listed in Table 8.

D0 - D15

CS (17)

DATA VALID

WR (44)

BUSACK (59)

BUSGRNT (45)

BUSREQ (19)

ADRINC (49)

t10

ID-WORD VALID

Figure 22 – MT Transfer Timing

CYCLE

SYM

DESCRIPTION

MIN

TYP

MAX

UNITS

Handshake

BUSREQ to BUSGRNT delay

800

BUSGRNT pulse width

166

BUSGRNT to BUSACK delay

Write Only

BUSACK to WR delay

320

330

370

WR to CS time

WR and CS pulse width

150

166

175

DATA VALID setup

CS to ADRINC delay

ARINC pulse width

166

t10

ID WORD VALID setup

100

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