Quantum Instruments DLT 7000 manual Status Phase, Status Bytes

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 3-23