hi-6131pqtf QuickLogic Corp, hi-6131pqtf Datasheet - Page 150

• Manufacturer Part Number: hi-6131pqtf
• Description: Mil-std-1553 / Mil-std-1760 3.3v Bc / Mt / Rt Multi-terminal Device
• Manufacturer: QuickLogic Corp

18.8. Remote Terminal 1 (RT1) Bus A Select Register (0x001C)
These 16-bit registers are Read-Write and are fully maintained by the host. These registers are cleared after MR pin
master reset, but are unaffected by assertion of RTxRESET remote terminal software reset in the Master Status and
Reset Register (0x0001).
The Bus A Select register is only used when the AUTOBSD bit in the RT Configuration Register equals 1. This AUTOBSD
setting means the device automatically fulfills mode commands MC20 (decimal) “selected transmitter shutdown” or
MC21 “override selected transmitter shutdown”. “Transmitter shutdown” or “shutdown override” can only occur for
the inactive bus. If either mode command is received on Bus B, the inactive bus is Bus A. The device compares the
received mode data word to the contents of the Bus A Select register to determine whether inactive Bus A is selected
for “transmitter shutdown” or “transmitter shutdown override”. (Bus shutdown or shutdown override can only occur for
the inactive bus.) If the data word matches the value stored in the Bus A Select register and AUTOBSD equals 1, the
device automatically fulfills MC20 “transmitter shutdown” or MC21 “shutdown override” without host assistance: If the
mode command received was MC20 (bus shutdown), the Transmit Shutdown A bit in the RT’s BIT (built-in test) Word
Register is asserted. If mode command MC21 (override bus shutdown) was received, the Transmit Shutdown A bit in
the BIT Word Register is negated.
18.9. Remote Terminal 1 (RT1) Bus B Select Register (0x001D)
These 16-bit registers are Read-Write and are fully maintained by the host. These registers are cleared after MR pin
master reset, but are unaffected by assertion of RTxRESET remote terminal software reset in the Master Status and
Reset Register (0x0001).
The Bus B Select register is only used when the AUTOBSD bit in the RT Configuration Register equals 1. This AUTO-
BSD setting means the device automatically fulfills mode commands MC20 (decimal) “selected transmitter shutdown”
or MC21 “override selected transmitter shutdown”. “Transmitter shutdown” or “shutdown override” can only occur for
the inactive bus. If either mode command is received on Bus A, the inactive bus is Bus B. The device compares the
received mode data word to the contents of the Bus B Select register to determine whether inactive Bus B is selected
for “transmitter shutdown” or “transmitter shutdown override”. (Bus shutdown or shutdown override can only occur for
the inactive bus.) If the data word matches the value stored in the Bus B Select register and AUTOBSD equals 1, the
device automatically fulfills MC20 “transmitter shutdown” or MC21 “shutdown override” without host assistance: If the
mode command received was MC20 (bus shutdown), the Transmit Shutdown B bit in the RT’s BIT (built-in test) Word
Register is asserted. If mode command MC21 (override bus shutdown) was received, the Transmit Shutdown B bit in
the BIT Word Register is negated.
MSB
MSB
15 14 13 12 11 10
15 14 13 12 11 10
0
0
0
0
Remote Terminal 2 (RT2) Bus A Select Register (0x0025)
Remote Terminal 2 (RT2) Bus B Select Register (0x0026)
0
0
0
0
0
0
0
0
Register Value
Register Value
0
9
0
9
0
8
0
8
RW
RW
7
7
0
0
0
6
0
6
0
0
5
5
4
4
0
0
0
3
0
3
HOLT INTEGRATED CIRCUITS
0
0
2
2
HI-6130, HI-6131
0
1
0
1
LSB
LSB
0
0
0
0
MR Reset
Host Access
Bit
MR Reset
Host Access
Bit
150