Exabyte EXB-8205 Betriebsanleitung PDF herunterladen (Seite 62)

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101

Message Sequence

When the CTS connects to the SCSI bus, the following sequence of

events occurs:

1. The initiator indicates its ability to accommodate more than the

Command Complete message by asserting the Attention signal

in the Selection phase before the Select signal is driven true and

the Busy signal is driven false.

2. To indicate its ability to accommodate more than the Command

Complete message, the CTS responds to the Attention signal by

transitioning to the Message Out phase immediately after

completing the Selection phase.

3. If the initiator supports messages other than Command

Complete, the first message sent by the initiator after the

Selection phase is the Identify message. This allows the physical

path to be established for the LUN specified by the initiator. The

CTSsupportsanLUNof0only.

4. If the DiscPriv bit (bit 6) in the Identify message is set, the CTS

may send the Disconnect message to the initiator to indicate that

the physical path will be broken temporarily.

If the DiscPriv bit is not set, the CTS will not send the Disconnect

message and will not temporarily suspend the physical path.

5. If the physical path has been broken temporarily, the CTS will

re-establish the communication path with the initiator by

entering the Reselection phase. After completing the reselection,

the CTS will send an Identify message to the initiator to

re-establish the physical path.

2-22

EXB-8205 and EXB-8505

(Standard and XL)

510503

2 SCSI Communication

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