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.

 

INTERFACE

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.

M3099GX/GH OEM Manual

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