Status Phase - Quantum DLT 8000 Product Manual

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).

3.5.5.4 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 as follows:
Status Bytes Returned from Tape
Drive
GOOD (00h)
CHECK CONDITION (02h)
BUSY (08h)
INTERMEDIATE GOOD (10h)
RESERVATION CONFLICT (18h)
COMMAND TERMINATED (22h)
3-26
Definition
This status indicates that the drive successfully
completed the command.
A contingent allegiance condition occurred. The
REQUEST SENSE command should be sent following
this status to determine the nature of the event.
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.
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.
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.
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 8000 Tape System