HI-6110 (REMOTE TERMINAL MODE)
RT OPERATION
RECEIVE DATA FIFO (Read only) Read Address: 0100
MIL-STD-1553 Message Data Word 15:0
15 14 13 12 11 10
The Receive Data FIFO is 32-words deep and holds MIL-
STD-1553 data words received by the RT. The FIFO is cleared
on Master Reset or after all words have been read by the host.
9
8
7
6
5
4
3
2
1
0
MSB
LSB
Alow FFEMPTY flag (pin or Status register) means FIFO data
is available to be read by the host. Successive data reads
cause FFEMPTYto go high when the last data word is read.
COMMAND WORD 1 REGISTER (Read only) Read Address: 0000
For all commands except RT to RT, the Command Word 1
register contains the last valid Command Word received.
Subaddress /
Mode
Data Word Count /
Mode Code
If the last valid command received was RT to RT, the
Command Word 1 register holds the first (receive) command
word and the Command Word 2 Register holds the second
(transmit) command word. Then if Message Register bits 3
and 9 are both 0, the Command Word 1 register contains the
valid command.
RT Address
MSB 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
LSB
COMMAND WORD 2 REGISTER (Read only) Read Address: 0001
If the last valid command received was RT to RT, the
Command Word 2 register contains the second (transmit)
command word. (See note above for Command Word 1.)
Whenever Message Register bit 3 or bit 9 is set, the valid
command is contained in the Command Word 2 register.
Subaddress /
Mode
Data Word Count /
Mode Code
RT Address
1
Whenever RCV is asserted, the active Command Word
register can always be determined by checking Message
Register bits 3 and 9.
MSB 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
LSB
TRANSMIT STATUS WORD REGISTER (Write only) Write Address: X000
The Transmit Status Word register holds bits 10:0 for the
status word transmitted by the remote terminal in response to
a (non-broadcast) command. Status word bits 15:11 are
automatically set to match the RT Address present at the
RTA4:0 input pins. The HI-6110 automatically transmits a
status word in response to valid non-broadcast commands.
The register may be changed anytime prior to status word
mid-sync bit. The Transmit Status Word register is not
affected by MR, master reset.
RT Address
R
R
R
MSB 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
LSB
RECEIVED STATUS WORD REGISTER (Read only) Read Address: 0011
RT Address
Updated only during RT to RT transmit messages, the
Received Status Word register captures the MIL-STD-1553
status word transmitted by the receiving remote terminal.
R
R
R
MSB 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
LSB
HOLT INTEGRATED CIRCUITS
14
HOLTIC [ HOLT INTEGRATED CIRCUITS ]
