CT2565 Aeroflex Circuit Technology, CT2565 Datasheet - Page 5

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

Aeroflex Circuit Technology
Note: Messages-transmission (routing) status pin (pin 16, Chan A/B) becomes active after loading the control word and command word
RECEIVE
Control Word
Receive Command
Data 1
Last Data
Looped Data Word
RTU Status
BIT
BUS CHANNEL A/B
MASK BROADCAST BIT
MODE CODE
BROADCAST
RT-RT
respectively. The signal is cleared by RESET or EOM low.
•
•
Table 3 – BC Memory Allocation
TRANSMIT
Control Word
Transmit Command
Looped Command Word
RTU Status
Data 1
Last Data
15
MASK BROADCAST BIT
•
•
BUS CHANNEL A/
DEFINITION
When logic "1" transmits over 1553 Bus A.
When logic "0" transmits over 1553 Bus B
(See note)
Always set to "0"
Command Word count field signifies mode code type
Multiple RTU’s addressed, no status word expected
When set, RTU(b) transmits, RTU(a) receives. Both RTU Status Words
are validated and sent to subsystem.
NOT USED
Figure 4 – BC Control Word
BROADCAST
MODE CODE
NOT USED
NOT USED
RT-RT
B
5
8
Loop Test
Upon receipt from the subsystem, the last word
to be transmitted within a given message
transfer (command or Data word) is stored in a
CT2565 internal register.
transmitted to the 1553 bus, it is looped back
through the active receiver channel for auto-BC,
Short Loop verification. A LOOPERR (.5us typ)
low pulse indicates a mismatch between the
stored and looped word.
initiates a handshake with a memory write to the
subsystem
(subsystem, CT2565, subsystem) verification.
Note that both short and long loop testing are
initiated for all transfers (on the last word
transmitted to 1553). Subsystems response to
use Long Loop Test is to compare the loaded
word to what was looped back into memory.
for
SCDCT2565 REV B 8/10/99 Plainview NY [phone]
user-defined,
0
The CT2565 also
As this word is
"long
loop"