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• Note that the initiator will release the SEL signal and may change
the DATA BUS no less than two deskew delays after it detects
that the BSY signal is true. The drive waits until the SEL signal
is false before asserting the REQ signal to enter an information
transfer phase. Other signals (e.g., MSG, C/D) may also be
asserted.
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Two optional time-out procedures are specified for clearing the SCSI bus if the
initiator waits a minimum of a selection time-out delay and there has been no BSY
signal response from the drive.
1. The initiator asserts the RST signal.
2. The initiator follows these steps:
a) Continues asserting the SEL and ATN signals and releases the
DATA BUS.
b) If it has not detected the BSY signal to be true after at least a
selection abort time plus two deskew delays, the drive releases the
SEL and ATN signals, allowing the SCSI bus to go to the BUS
FREE phase.
When responding to selection, SCSI devices ensure that the selection was still
valid within a selection abort time of their assertion of the BSY signal. Failure to
comply with the requirement could result in an improper selection.