CT2565 Aeroflex Circuit Technology, CT2565 Datasheet - Page 11

• Manufacturer Part Number: CT2565
• Description: CT2565 Bus Controller/ Remote Terminal and BUS Monitor FOR MIL-STD-1553B
• Manufacturer: Aeroflex Circuit Technology

Aeroflex Circuit Technology
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.
transfers are accompanied by a 1553 Status
Word. Figure 12 details a RTU single message
transfer.
BUSREQ (19)
ADRINC (49)
LWORD (29)
BUSREQ (19)
ADRINC (49)
LWORD (29)
INCMD (9)
1553 BUS
EOM (57)
D0 - D15
INCMD (9)
1553 BUS
EOM (57)
D0 - D15
Figure 10 – BC Mode Code Transmit Last Command (10010) Timing
Figure 11 – BC Mode Code Transmit Status Word (00010) Timing
CTL
CTL
CMD
Notes:
All timing is typical unless otherwise noted.
CMD
All data block
CMD
CMD
RT
RT
A
A
P
P
11
50/80µsec
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.
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.
40/60µsec
70/80µs
LOOP
LOOP
STAT
STAT
80/166ns
900ns
80/166ns
900ns
RT
A
RT
P DATA
A
STAT
SCDCT2565 REV B 8/10/99 Plainview NY [phone]
400/500ns
P
STAT
5.0±0.5µs
LCMD
P
400/500ns
LCMD
These inputs