Core1553BBC MIL-STD-1553B Bus Controller
Message Types
The 1553B bus supports ten message transfer types, allowing basic point-to-point and broadcast BC to RT data
transfers, mode code messages, and direct RT-to-RT messages. Figure 4 shows the message formats.
BC-to-RT Transfer
BC
BC
RT
Transmit
Command
Data
0
Data
. . .
Data
n
Response
Time
Status
Word
Message
Gap
Next
Command
RT-to-BC Transfer
BC
RT
BC
Receive
Command
Response
Time
Status
Word
Data
0
Data
. . .
Data
n
Message
Gap
Next
Command
RT-to-RT Transfer
BC
BC
RT1
RT2
Receive
Command Command
Transmit Response
Status
Word
Data
0
Data
. . .
Data
n
Response
Time
Status
Word
Message
Gap
Next
Command
Time
BC-to-all-RTs Broadcast
BC
BC
Transmit
Command
Data
0
Data
. . .
Data
n
Message
Gap
Next
Command
RT-to-all RTs Broadcast
BC
RT
BC
Receive
Command Command
Transmit Response
Status
Word
Data
0
Data
. . .
Data
n
Message
Gap
Next
Command
Time
Mode Command, No Data
BC
BC
RT
Mode
Command
Response
Time
Status
Word
Message
Gap
Next
Command
Mode Command, RT Transmit Data
BC
BC
RT
Mode
Command
Response
Time
Status
Word
Mode
Data
Message
Gap
Next
Command
Mode Command, RT Receive Data
BC
BC
RT
Mode
Command
Mode
Data
Response
Time
Status
Word
Message
Gap
Next
Command
Broadcast Mode Command, No Data
BC
BC
Mode
Command
Message
Gap
Next
Command
Broadcast Mode Command with Data
BC
BC
Mode
Command
Mode
Data
Message
Gap
Next
Command
Figure 4 • 1553B Message Formats
v4.0
5
ACTEL [ Actel Corporation ]
