Quantum DLT 8000 Handbuch PDF herunterladen (Seite 123)

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SCSI Description

Quantum DLT 8000 Tape System 3-21

3.5.5.1 Asynchronous Data Transfer

Drive to Initiator Transfer Procedure

1. The drive drives the DB (0-15, P, & P1) signals to their desired values.

2. Drive delays at least one deskew delay plus a cable skew delay.

3. Drive asserts the REQ signal.

4. Initiator reads the DB (0-15, P, & P1) signals.

5. Initiator indicates its acceptance of the data by asserting the ACK signal.

6. When ACK is true at the drive, drive can change or release the DB (0-15, P, & P1)

signals.

7. Drive negates the REQ signal.

8. Initiator negates the ACK signal.

9. Drive can continue the transfer by driving the DB (0-15, P, & P1) signals and

asserting the REQ signal (Steps 1 – 3).

Initiator-to-Drive Transfer Procedure

1. Drive asserts the REQ signal.

2. Initiator drives the DB (0-15, P, & P1) signals to their desired values.

3. Initiator delays at least one deskew delay plus a cable skew delay.

4. Initiator asserts the ACK signal.

5. When ACK is true at the drive, drive reads the DB (0-15, P, & P1) signals.

6. Drive negates the REQ signal.

7. Initiator can change or release the DB (0-15, P, & P1) signals.

8. Initiator negates the ACK signal.

9. Drive can continue the transfer by asserting the REQ signal (Step 1).

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