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CDU-541 CD-ROM DRIVE SCSI INTERFACE MANUAL
If the ROM Diagnostic field is set to one, it indicates that the controller
ROM has failed.
If the ROM Diagnostic field is set to two, it indicates that
the drive control ROM has failed.
If the RAM Diagnostic field is set to one, it indicates that the controller
RAM has failed.
If the RAM Diagnostic field is set to two, it indicates that
the drive control RAM has failed.
If the Data Buffer Diagnostic field is set to one, it indicates that the
controller data buffer has failed.
If the Data Buffer Diagnostic field is set
to two, it indicates that the drive control data buffer has failed.
If the
Data Buffer Diagnostic field is set to four, it indicates that the drive
control error RAM has failed.
If the Interface Diagnostic field is set to one, it indicates that the
controller - drive control interface has failed.
If the Interface Diagnostic
field is set to two, it indicates that the drive control - mechanism control
interface has failed.
5
.2.26 . RELEASE Command
==============================================================================
Bit:
7
6
5
4
3
2
1
o
Byte
1
==============================================================================
o
1
Operation Code (17h)
\
-----1------------------------:----------------------------------------------\
1
I
Logical Unit Number
I
3rdPty
I
Third Party Device 10
I
Reserved \
-----\-----------------------------------------------------------------------1
2
:
Reserved
:
-----1-----------------------------------------------------------------------1
3
I
Reserved
\
-----\-----------------------------------------------------------------------1
4
I
Reserved
\
-----1-----------------------------------------------------------------------1
5
I
Control Byte
\
==============================================================================
The RELEASE command is used to release previously reserved logical units.
It is not an error for an initiator to attempt to release a reservation tha·t
is not currently active.
In this case, the controller returns GOOD status
without altering any other reservation.
This command will cause the controller to terminate the logical unit
reservation from the initiator
The third-party release for the RELEASE command allows an initiator to
release a logical unit reserved using third-party reservation.
If the third-party (3rdPty) bit is zero, then the third-party release option
is not requested.
If the 3rdPty bit is one, the controller will release the
specified logical unit only if the reservation was made using the third-party
reservation option by the initiator that is requesting the release for the
same initiator as specified in the third-party device 10 field.
5-50
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