Table 2. Mode Code Operation
Mode Code (7)
Number
Legal (L)/
Illegal (I)
Operation 1553A
(see below) Mode
Notes
Dynamic Bus Control
00000
I
Synchronize
00001
L
Transmit Status Word
00010
L
Initiate Self-Test
00011
L
Transmitter Shutdown
00100
L
Override Transmitter
00101
L
Shutdown
Inhibit Terminal Flag Bit
00110
L
Override Inhibit
00111
L
Terminal Flag Bit
Reset Remote Terminal
01000
L
1
L(2)
2
L(2)
3
L(2)
2
L(2)
3,8
L(2)
3,8
L(2)
3,8
L(2)
3,8
L(2)
2
L(2)
Reserved
01001
I
01111
1
L(2)
Transmit Vector Word
10000
L
Synchronize
10001
L
Transmit Last Command
10010
L
Transmit Bit Word
10011
L
Selected Transmitter
10100
L
Shutdown
Override Selected
10101
L
Transmitter Shutdown (6)
4
L(2)
4
N/A
5
L(2)
4
L(2)
4
N/A
4
N/A
Reserved
10110-
I
11111
1
L(2)
Definition of operations:
1. The RTMP sets the Message Error bit, sends a status word, and stores the 1553
command word, but takes no internal action.
2. The RTMP sends a status word, stores the 1553 command word, but takes no
internal action
3. The RTMP sends a status word, stores the 1553 command word, and takes the
appropriate internal action.
4. The RTMP sends a status word, stores the 1553 command word, accesses memory
for the associated data word, but takes no internal action.
5. The RTMP sends a status word, updates the 1553 command word in an internal register,
accesses memory for the associated data word, but takes no internal action.
6. The RTMP must receive an Override Selected Transmitter Shutdown before the channel
that was disabled can be enabled.
7. Undefined mode codes in MIL-STD-1553B are illegalized.
8. Illegalized mode code is still executed.
No mode code with data
Status word only
No mode code with data
No mode code with data
6.0 RTMP SYSTEM INTERFACE
The RTMP system interface consists of the major functional
interfaces between the host processor and the RTMP. These
interfaces (1) allow the host to control the functions of the
RTMP and determine its operational status; (2) permit the
RTMP and the host to exchange the information from the
1553 data bus; and (3) allow the host to select the RTMP’s
terminal address.
The system interface provides a description of the following
aspects of the RTMP’s operation:
• Assigning the RTMP’s terminal address
• Controlling the RTMP’s DMA interface
• Interfacing with the RTMP’s internal registers
RTMP-27