HI-6110 (BUS MONITOR MODE)
MT OPERATION
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
RT Address
T/R
When RCV is asserted, if Message Register bit 2 or bit 8 is set,
the new message is RT to RT. The Command Word 1 register
holds the first (receive) command and the Command Word 2
Register holds the second (transmit) command.
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
Subaddress /
Mode
Data Word Count /
Mode Code
The Command Word 2 register contains the second (transmit)
command word from the last RT-RT message. (See note
above for Command Word 1.)
RT Address
Whenever RCV is asserted, RT-RT messages can be
detected by checking Message Register bits 2 and 8.
MSB 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
LSB
RECEIVE MODE DATA REGISTER (Read only) Read Address: 0010
Mode Data Word 15:0
The read-only Receive Mode Data Register holds the Mode
Code Data Word received during a Mode Code with Data
Word (Receive) Command.
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
MSB
LSB
BUS MONITOR OPERATION (MT mode)
When configured as a Bus Monitor with no assigned RT address,
the HI-6110 continuously monitors the selected MIL-STD-1553
bus and passively captures all bus traffic. The HI-6110 never
transmits information onto the bus. When a Command Word is
received, a validation check is performed. If the Command Word
contains no errors, the RFLAG pin goes low and the HI-6110 MT
captures the complete message in its internal registers and
Receiver Data FIFO as appropriate.
If the valid Command Word was received on Bus A, the RCVA
signal goes high to notify the host that a new message has
commenced. The RCVB pin is asserted when the valid Command
Word arrived on Bus B.
The Command Word may be read from the Command Word 1
register, or the Message register can be read to directly learn the
type of command received.
BUS MONITOR OPERATION (MT/RT mode)
When configured as a Monitor with assigned RT address, the HI-
6110 responds to all commands that match its hard-wired RT
address as described in the RT section of this data sheet.All other
bus traffic is monitored as described in this MTsection.
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HOLTIC [ HOLT INTEGRATED CIRCUITS ]
