SCSI Description

∙When switching the DATA BUS from in to out, the drive releases the DATA BUS no later than a deskew delay after negating the I/O signal.

∙The ATN and RST signals can change as defined under the descriptions for the attention condition (Section 3.6.1) and reset condition (Section 3.6.2).

3.5.5.4STATUS Phase

The tape drive enters the status phase just once per command unless a retry is requested by the initiator. The only exception is during error cases when the device goes immediately to bus free, as defined in the ANSI SCSI-2 specification.

Status bytes the tape drive can return are listed in the following table:

Table 3–6 Status Bytes

Status Bytes Returned from Tape Drive

Definition

 

 

GOOD (00h)

This status indicates that the drive successfully completed

 

the command.

CHECK CONDITION (02h)

A contingent allegiance condition occurred. The REQUEST

 

SENSE command should be sent following this status to

 

determine the nature of the event.

BUSY (08h)

Target is busy. This status is returned whenever the device

 

is unable to accept a command from an otherwise

 

acceptable initiator. The initiator should reissue the

 

command at a later time.

INTERMEDIATE GOOD (10h)

This status is returned instead of GOOD for commands

 

issued with the LINK bit set = 1. Following the return of

 

this status, the drive proceeds to the COMMAND phase for

 

the transfer of the next linked command.

RESERVATION CONFLICT (18h)

This status is returned by the drive whenever a SCSI device

 

attempts to access the drive when it has been reserved for

 

another initiator with a RESERVE UNIT command.

COMMAND TERMINATED (22h)

This status is returned for a command that was terminated

 

via a TERMINATE I/O PROCESS message. This status also

 

indicates that a contingent allegiance condition has

 

occurred.

 

 

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Status Phase, Status Bytes
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DLT 7000 specifications

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