CT2565 datasheet(11/31 Pages) AEROFLEX

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

CMD

RTA

STAT

RTA P DATA

LCMD

CTL

CMD

LOOP

STAT

LCMD

EOM (57)

900ns

5.0±0.5µs

INCMD (9)

LWORD (29)

D0 - D15

1553 BUS

BUSREQ (19)

ADRINC (49)

80/166ns

70/80µs

400/500ns

Figure 10 – BC Mode Code Transmit Last Command (10010) Timing

CMD

RTA

CTL

CMD

LOOP

STAT

EOM (57)

900ns

INCMD (9)

LWORD (29)

D0 - D15

1553 BUS

BUSREQ (19)

ADRINC (49)

80/166ns

50/80µsec

400/500ns

Figure 11 – BC Mode Code Transmit Status Word (00010) Timing

STAT

RTA

40/60µsec

Notes:

All timing is typical unless otherwise noted.

RTU Operation

Each RTU is assigned a unique address on the

1553 bus. It processes commands issued by the

its

address

through

Broadcast

commands.

Upon receipt of a valid command in the RTU

mode, the CT2565 will attempt to (1) transfer

1553 data received to the subsystem, (2) read

data from the subsystem for transmission on the

1553 bus, (3) transmit status information to 1553,

or (4) set status conditions.

All data block

transfers are accompanied by a 1553 Status

Word. Figure 12 details a RTU single message

transfer.

RTU Address

RTU Address pins 33-34 and 72-74 and Address

Parity pin (odd parity) should be programmed to

a unique RTU (1553) address.

These inputs

have internal pull-ups and will default a high state

if left unconnected. The CT2565 will not respond

odd

parity

compromised

(See

Error

Handling).

RTU Initialization

Initialize the CT2565 as an RTU per Table 2.

Upon receipt of valid command word from the

serial bus (RTU addressed or broadcast CMD),

the CT2565 will pulse NBGRNT (New Bus Grant)

pin 42 low.

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