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SCSI Description
Quantum DLT 7000 Tape System 3-23
• 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).
3.5.5.4 STATUS 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.