CT2565 Datasheet, PDF (11/31 Pages) Aeroflex Circuit Technology – CT2565 Bus Controller, Remote Terminal and BUS Monitor FOR MIL-STD-1553B

1553 BUS
CMD RT_A P
STAT RT_A P DATA LCMD P
INCMD (9)
BUSREQ (19)
ADRINC (49)
D0 - D15
LWORD (29)
EOM (57)
CTL CMD
70/80µs
900ns
80/166ns
LOOP
STAT
5.0±0.5µs
LCMD
400/500ns
Figure 10 – BC Mode Code Transmit Last Command (10010) Timing
1553 BUS
INCMD (9)
BUSREQ (19)
ADRINC (49)
D0 - D15
LWORD (29)
EOM (57)
CMD RT_A P
STAT RT_A P
CTL CMD
50/80µsec
900ns
80/166ns
LOOP
40/60µsec
STAT
400/500ns
Notes:
All timing is typical unless otherwise noted.
Figure 11 – BC Mode Code Transmit Status Word (00010) Timing
RTU Operation
Each RTU is assigned a unique address on the
1553 bus. It processes commands issued by the
BC to its address or 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
if odd parity is 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.
Aeroflex Circuit Technology
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SCDCT2565 REV B 8/10/99 Plainview NY [phone]