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RESELECTION is an optional phase that allows a drive to reconnect to an initiator
to continue an operation that was previously started by the initiator but was
suspended by the drive.
The initiator determines that it is reselected when the SEL and I/O signals and its
SCSI ID bit are true, and the BSY signal is false for at least one bus settle delay.
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1. Upon completing the ARBITRATION phase, asserts both the BSY and
SEL signals.
2. Delays at least one bus clear delay plus one bus settle delay.
3. Asserts the I/O signal.
4. Sets the DATA BUS to the logical OR of its SCSI ID bit and the
initiator’s SCSI ID bit.
5. Waits at least two deskew delays.
6. Releases the BSY signal.
7. Waits at least one bus settle delay before looking for a response from
the initiator.
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8. Determines that it is selected when the following occur for at least one
bus settle delay: SEL, I/O, and the initiator’s SCSI ID bit are true and
BSY is false.
9. Examines the DATA BUS to determine the SCSI ID of the reselecting
drive.
10. Asserts the BSY signal within a selection abort time of its most recent
detection of being reselected.
• The initiator does not respond to a RESELECTION phase if bad
parity is detected or if more than two SCSI ID bits are on the
DATA BUS.