HI-6110 (BUS CONTROLLER MODE)
BC OPERATION
COMMAND WORD 1 REGISTER (Write only) Write Address: X000
Subaddress /
Mode
Data Word Count /
Mode Code
RT Address
The Command Word 1 register is loaded by the host with the
MIL-STD-1553 Command Word to be issued by the Bus
Controller. Bit 10 should be set forTransmit, reset for Receive.
MSB 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
LSB
For RT to RT commands, Command Word 1 register holds the
receive command word and Command Word 2 register holds
the transmit command word.
COMMAND WORD 2 REGISTER (Write only) Write Address: X001
Used only for RT-to-RT commands, the Command Word 2
register is loaded by the host with the MIL-STD-1553 transmit
Command Word addressed to the transmitting Remote
Terminal. The Command Word 1 register is loaded with the
receive Command Word addressed to the receiving Remote
Terminal.
Subaddress /
Mode
Data Word Count /
Mode Code
RT Address
1
MSB 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
LSB
If the next Message is not an RT-to-RT transfer, it is necessary
to write theTransmit/Receive bit 10 to “0”.
STATUS WORD 1 REGISTER (Read only) Read Address: 0000
The Status Word 1 register holds the returned MIL-STD-1553
Status Word received from an RT responding to a BC issued
command.
RT Address
For RT to RT commands, the Status Word 1 register captures
the status word returned by the receiving remote terminal,
while the Status Word 2 register captures the status word
returned by the transmitting remote terminal
R
R
R
MSB 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
LSB
STATUS WORD 2 REGISTER (Read only) Read Address: 0001
RT Address
Used only for RT to RT commands, the Status Word 2 register
captures the MIL-STD-1553 status word returned by the
transmitting remote terminal.
R
R
R
MSB 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
LSB
BUS A WORD REGISTER (Read only) Read Address: 1001
BUS B WORD REGISTER (Read only) Read Address: 1010
Bus A/B Word 15:0
In BC mode, the Bus A Word register holds the last valid MIL-
STD-1553 word received on Bus A. The Bus B Word register
holds the last valid MIL-STD-1553 word received on Bus B.
MSB 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
LSB
While /STROBE is low to read a Bus Word register, the sync
type associated with the stored word can be determined from
the RF0 and RF1 pins. The RF1 signal is high for Command
Sync, the RF0 signal is high for Data Sync.
HOLT INTEGRATED CIRCUITS
6
HOLTIC [ HOLT INTEGRATED CIRCUITS ]
