1.3.3Disconnect/reconnect processing

When processing is performed by the TARG during the command execution process which does not require operation on the SCSI bus, the TARG can return the SCSI bus to the BUS FREE phase temporarily by disconnect processing and execute command internally. Through this function, the INIT is enabled to process multiple commands on the SCSI bus.

(1)Disconnect permission conditions and commands with executing disconnect process

If all of the conditions shown below for permitting a disconnect are satisfied, the IDD executes disconnect processing. However, As shown in Table 1.2, disconnect processing may be valid or invalid, and the disconnect processing execution timing may differ, depending on the type of command.

Conditions for Permitting a Disconnect

1)The SCSI ID of the INIT is notified in the SELECTION phase.

2)The INIT generates the ATTENTION condition in the SELECTION phase.

3)The INIT notifies the TARG that disconnect processing is permitted by an IDENTIFY message.

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Fujitsu MAN3735, MAN3367, MAN3184 specifications Disconnect/reconnect processing, Conditions for Permitting a Disconnect
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MAN3735, MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES, MAN3367, MAN3184 specifications

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