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M3099GX/GH OEM Manual
Reset Condition
The reset condition is used to immediately clear all SCSI devices
from the bus. This condition shall take precedence over all other
phases and condtions. Any SCSI device may create the reset
condition by asserting the RST signal for a minimum of a reset hold
time.
All SCSI devices shall release all SCSI bus signals (except the RST
signal) within a bus clear delay of the transition of the RST signal to
true. The BUS FREE phase always the reset condition.
The effect of the reset condition on I/O processes which have not
completed, SCSI device reservations, and SCSI device operation
modes is determined by whether the SCSI device has implemented
the hard reset alternative or the soft reset alternative (one of which
shall be implemented) as defined in ANSI SCSI-2 6.2.2.1 and
6.2.2.2. The hard and soft reset alternative is implemented is
provided in the SftRe bit of the INQUIRY data. This scanner
supports Hard Reset alternative as below.
Hard Reset Alternative:
1) Clear all I/O process including queued I/O process.
2) Release all SCSI device reservations.
3) Return any SCSI device operation modes to their appropriate
initial conditions, similar to those conditions that would be
found after a normal power-on reset. MODE SELECT
conditions shall be restored to their last saved values if saved
values have been established. MODE SELECT conditions for
which no values have been save shall be returned to their default
values.
4) Unit attention condition shall be set.
Note: I/O process queuing in (1) and parameter saving in (3) are
not supported in this scanner.
INTERFACE
3-25
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