HI-6137 Datasheet, PDF (206/230 Pages) Holt Integrated Circuits – 40 MHz SPI Host Interface

HI-6137
Circumstances for
Received Message
Terminal Response to
Received Command
Bits Updated
in Descriptor
Control Word
Bits Updated in Data Interrupt
Buffer Msg Info Word Options
TRANSMITTER
SHUTDOWN (MC4):
Mode code command
with mode code
00100
and T/R bit equals 1
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-
DBAC bit reset.
BCAST bit
updated.
DPB bit toggles.
mission, inhibit the inactive bus:
Normal CS update:
BUSID bit updated.
MERR bit reset.
ILCMD bit reset.
RTRT bit reset.
(All error bits reset.)
IWA
IBR
The device automatically shuts down either transmit and receive or transmit only for the inactive bus,
depending on the state of the BSDTXO bit in the Master Configuration Register. Refer to the description of the
AUTOBSD bit in the “Remote Terminal Configuration Register (0x0017)” for further information. When MC4 results
in transmitter shutdown, the condition is reflected by assertion of a TXASD or TXBSD bit in the corresponding
“Remote Terminal Built-In Test (BIT) Word Register (0x001E)”. If BSDTXO equals logic 0, an RXASD or RXBSD
bit will also be asserted, indicating full bus shutdown (transmit and receive). Once shutdown, the inactive bus
transmitter (or transmitter and receiver) can be reactivated by an “Override Transmitter Shutdown” MC5 or MC21
or “Reset Remote Terminal” MC8 mode code command, or by software reset (initiated by setting the RTRESET
bit in the “Master Status and Reset Register (0x0001)”) or by hardware reset initiated by asserting the MR Master
Reset input pin.
MC4 EXCEPTIONS:
Invalid command word.
OR
T/R bit equals 0 and
UMCINV bit in the RT
Configuration Register
equals 1 ***
No terminal response,
the message is ignored.
No Status Word change.
(mode code is undefined
when T/R bit equals 0)
No Change
No Message Info
Word is written
None
T/R bit equals 0
AND
UMCINV bit in the RT
Configuration
Register equals 0.
The Illegalization Table
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.
Normal CS update:
DBAC bit set. BUSID bit updated.
BCAST bit
MERR bit reset.
IWA
updated.
ILCMD bit reset.
IBR
DPB bit toggles. RTRT bit reset.
(Other error bits reset.)
T/R bit equals 0
AND
UMCINV bit in the RT
Configuration Register
equals 0.
The Illegalization Table
bit equals 1 **
Set Message Error (ME)
status. If not broadcast,
transmit Status Word.
If broadcast, also set
Status Word BCR bit and
suppress Status response.
DBAC bit set.
BCAST bit
updated.
DPB bit toggles.
ILCMD bit set.
MERR bit set.
BUSID bit updated.
RTRT bit reset.
(Other error bits reset.)
ILCMD
IWA
IBR
Mode code command
word is followed by a
contiguous data word
No Status Word transmit.
Set the Message Error
(ME) status bit.
DBAC bit set.
BCAST bit reset.
DPB bit toggles.
MERR bit set.
WCTERR bit set.
BUSID bit updated.
ILCMD bit reset.
RTRT bit reset.
(Other error bits reset.)
MERR
IWA
* 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”.
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