HP 220mx Guide de l'utilisateur télécharger pdf (Page 23)

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101

SCSI Command Overview

Drive Control Commands

Chapter 11-4

Data phase

The data phase encompasses both the “data in” phase and the “data out”

phase to transfer data to and from the drive. Synchronous and

asynchronous data transfers are supported.

The data in phase allows the target to request that data be sent to the

initiator from the target.

The data out phase allows the target to request that data be sent from

the initiator to the target.

Command phase

The command phase sends the Command Descriptor Block (CDB) from

the initiator to the drive.

Message phase

The message phase refers to a message in or a message out phase.

Multiple messages may be sent during either phase. The first byte

transferred in either of these phases is either a single-byte message or

the first byte of a multiple-byte message. Multiple-byte messages are

wholly contained within a single message phase.

Message In phase allows the target to request that messages be sent to

the initiator from the target.

Message Out phase allows the target to request that messages be sent

from the initiator to the target. The target invokes this phase in response

to the attention condition created by the initiator.

See Table 1-1 on page 1-5 for a list of supported messages.

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HP 220mx Guide de l'utilisateur Page 23

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