Table A-9: Scsi B_T_L Target Descriptor Format - Spectra Logic Spectra S50 User Manual

SCSI B_T_L Target Descriptor Format
Targets identified using their SCSI Bus, Target ID, and LUN are identified using the
target descriptor format shown in Table A-9. The Descriptor Type Code for this
descriptor is E3h.

Table A-9: SCSI B_T_L Target Descriptor Format

Bit
Byte 7
0
1
2
3
4
5
6
7
8
M
The Address Type is 3. Byte 5 is defined as the SCSI Bus of the target device, Byte 6 is
defined as the SCSI Target ID of the target device, and Byte 7 is logical unit number of
the target device.
The Device Type Field is as identified in Target Descriptors on page 85.
The Device-Type Specific field is defined in Target Descriptor Device-Specific Fields on
page 90.
Target Descriptor Device-Specific Fields
Device-specific fields directly follow the Device Target Descriptors. The device-specific
fields are used to convey information specific to the device defined by the target
descriptor.
Prior to executing a segment descriptor, the copy manager may verify the information
in the target descriptor's device-specific fields; however, the copy manager will not
issue any commands that change the state of the target device to verify the
information.
Appendix A. Extended Copy—83h—143r1 Specifications
6 5 4
Descriptor Type Code (E3h)
Reserved
Target Descriptor Length
SCSI Target ID
Logical Unit Number
Device-Type Specific
90
3 2
Device Type
Reserved
Reserved
SCSI Bus
1 0