SCSI Description

The initiator asserts the RST signal and 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.

3.5.4 RESELECTION Phase

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.

3.5.4.1 Reselection Sequence

The drive:

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.

The initiator:

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.

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Reselection Phase, Reselection Sequence
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DLT 7000 specifications

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