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S1R72105 Technical Manual
Parity error in the SCSI data phase or command stop operation by detecting ATN
The following points should be noted when the port interface is used as slave:
If a setting has been made that a parity error or detection of ATN in SCSI data phase stops the operation of a
command (STATN/STPPE/SPCEN bit of SCSIMODE register), the occurrence of such factor and subsequent
command stop causes negation of PDREQ being output to the port interface at the internal timing of the IC.
Accordingly, use such setting after checking that it causes no problem in handshake on the LSI side connected
to the IC.
In such a case, no problem occurs in the internal sequence of the IC if XPDACK or XPRD/XPWR may come
from the port side. Though, data transfer to and from FIFO may be obstructed depending on timing
(The data may not be written in or read from FIFO).
In such a case, FIFO terminates in uncompleted manner, so it requires clearing before going to the status phase.
Rev.1.0
EPSON
61
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