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7.3.5 SCSI Mode Select0 (SCSIMODE0) R/W
Makes the operational settings related to SCSI interface.
7
6
5
SINTEN
DTCD
-
BIT7 SCSI INTERRUPT ENABLE
If this bit is HIGH, any SCSI interruption but DTCMP is enabled.
[ASCMP may occur if this bit is HIGH. If the IC is used in polling processing, make firmware ignore the ASCMP
interruption.]
BIT6 DTCMP DISABLE
If this bit is HIGH, DTCMP interrupt is disabled.
BIT5 RESERVED
BIT4 ULTRA SCSI
If this bit is HIGH, ULTRA-SCSI transfer is enabled. It is valid only when RATE bit of SYNCMODE register is set
to "0" or "1".
BIT3 AUTO1 (auto status)
Executes automatically STS_MSG, Busfree, and Wait_SEL_CMD after DMA_DATA_IN/OUT command was
executed.
At the end of execution, ASCMP interrupt occurs. The bit is valid also in FIFO-DMA mode.*AUTO
BIT2 AUTO2 (status message stop)
Executes automatically STS_MSG after DMA_DATA_IN/OUT command was executed.
At the end of execution, ASCMP interrupt occurs. The bit setting is valid also in FIFO-DMA mode.
[When this bit is used, EXECbit is not turned OFF even if ASCMP occurs. Configure the firmware so that it ignores
the status of EXECbit.] *AUTO
*AUTO :
During the execution of AUTO1 or 2, AUTO bit of SCSIMODE1 register is deemed as "1".
Also, EXEC bit is "1" during the execution of AUTO1 or 2. Because internal sequencer writes the command in
SCSI block for CPU, COMMAND register can read the command value then under execution.
DTCMP interrupt occurs irrespective of the settings of AUTO1or 2. Set DTCD (bit6) of this register to "Hi" to
disable such interruption.
BIT1 ACTIVE NEGATION CONTROL
HIGH of this bit enables the function of active negation of SCSI REQ/ACK signals.
BIT0 ACTIVE NEGATION DATA
HIGH of this bit enables the function of active negation of the SCSI data and parity signals.
Rev.1.1
4
3
2
ULTRAS
AUTO1
AUTO2
S1R72104 Technical Manual
1
0
09h
AN_C
AN_D
ACTIVE NEGATION DATA
ACTIVE NEGATION CONTROL
AUTO2 (status message stop)
AUTO1 (auto status)
ULTRA SCSI
DTCMP DISABLE
SCSI INTERRUPT ENABLE
EPSON
13
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