HI-6121PQMF HOLTIC [Holt Integrated Circuits], HI-6121PQMF Datasheet - Page 90

• Manufacturer Part Number: HI-6121PQMF
• Description: MIL-STD-1553 Remote Terminal ICs
• Manufacturer: HOLTIC [Holt Integrated Circuits]

RT MESSAGE RESPONSES, OPTIONS & EXCEPTIONS, Cont.
Circumstances for
Received Message
Mode code command
with mode code 00100
and T/ bit equals 1
MC4 EXCEPTIONS:
Invalid command word.
——— OR ———
T/ bit equals 0 and
UMCINV bit in Config.
Register 1 equals 1 ***
——— AND ———
UMCINV bit in Config.
Register 1 equals 0.
The Illegalization Table
bit equals 0 *
——— AND ———
UMCINV bit in Config.
Register 1 equals 0.
The Illegalization Table
bit equals 1 **
Mode code command
word is followed by a
contiguous data word
* Command is illegal but terminal is not using “illegal command detection” (in form response).
** Command is illegal and terminal is using “illegal command detection”
*** Undefined mode command rendered invalid by UMCINV option bit. Command’s bit in Illegalization Table is “don’t care”.
TRANSMITTER
T/ bit equals 0
T/ bit equals 0
R
SHUTDOWN
R
R
(MC4)
R
Terminal Response
to Received Command
Default response: Reset
Message Error (ME) status
then transmit Status Word. If
broadcast, set Status Word
BCR bit and suppress status.
transmit. After Status trans-
mission, inhibit the inactive bus:
The device automatically shuts down either
the inactive bus, depending on the state of the SDSEL bit in Configuration Register 2.
(See description of SDSEL and MCOPT4 bits in Configuration Register 2 for further information.
When a bus transmitter (or transmitter and receiver) is shut down by mode command, bus status
is reflected by assertion of a TXASD or TXBSD bit in the Built-In Test Register at register address
0x0014. If SDSEL equals logic 0, an RXASD or RXBSD bit will also be asserted. See Built-In Test
Register description for further information.
Once shutdown, the inactive bus transmitter (or transmitter and receiver) can only be
reactivated by an “Override Transmitter Shutdown” MC5 or MC21 or “Reset Remote Terminal” MC8
mode code command, or by software reset (by setting the SRST bit in Configuration Register 1)
or by hardware reset initiated by asserting the
No terminal response,
the message is ignored.
No Status Word change.
(mode code is undefined
when T/ bit equals 0)
Respond “In form”: Reset
Message Error (ME) status.
If not broadcast, transmit
Status Word. If broadcast,
set the BCR status bit and
suppress status response.
Set Message Error (ME)
status. If not broadcast,
transmit Status Word.
If broadcast, also set
Status Word BCR bit and
suppress Status response.
No Status Word transmit.
Set the Message Error
(ME) status bit.
R
FOR THE HI-6120 / HI-6121 REMOTE TERMINAL
SUMMARY OF MESSAGE RESPONSES
HOLT INTEGRATED CIRCUITS
HI-6120, HI-6121
90
Bits Updated
in Descriptor
Control Word
DBAC bit reset.
BCAST bit updated.
DPB bit toggles.
No change.
DBAC bit set.
BCAST bit updated.
DPB bit toggles.
DBAC bit set.
BCAST bit updated.
DPB bit toggles.
DBAC bit set.
BCAST bit reset.
DPB bit toggles.
transmit and receive
MR
master reset input pin.
or
transmit only
Bits Updated
in Data Buffer
Msg Info Word
Normal CS update:
BUSID bit updated.
MERR bit reset.
ILCMD bit reset.
RTRT bit reset.
(All error bits reset.)
No Message Info
Word is written
Normal CS update:
BUSID bit updated.
MERR bit reset.
ILCMD bit reset.
RTRT bit reset.
(All error bits reset.)
ILCMD bit set.
MERR bit set.
BUSID bit updated.
RTRT bit reset.
(Other error bits reset.)
MERR bit set.
WCTERR bit set.
BUSID bit updated.
ILCMD bit reset.
RTRT bit reset.
(Other error bits reset.)
for
Interrupt
Options
ILCMD
MERR
None
IWA
IWA
IWA
IWA
IBR
IBR
IBR