Operation Code Format; Table 12 Command Descriptor Block - Field Descriptions; Table 13 Operation Code Format - Data Format; Table 14 Operation Code Format-Field Descriptions - Quantum LTO 2 User Manual

Table 12 Command Descriptor
Block — Field Descriptions

Operation Code Format

Table 13 Operation Code
Format — Data Format
Table 14 Operation Code
Format—Field Descriptions
LTO-2 SCSI Interface Guide
Field Byte
Operation
Code
Ignored
Logical Unit
Command
Dependent
Reserved
Control
Fields that are one byte or longer have no entry in the Bits column.
The Operation Code is composed of the Group Code and Command
2
Code (see table 13
Bit
7
Byte
Group Code
0
Field
Group Code
Command Code
Bits Description
0 The Operation Code is made up
of the Group Code and the
Command Code (see
1 5-7 The LUN field is vestigial from
the SCSI-1 standard and is
ignored.
1 0-4 See the specific command.
2-4 or
2-8
All reserved bits must be 0.
Last The Control byte is made up of
the Vendor Unique, Flag and
Link bits. See
Format on page
and table 14).
6 5 4
Byte Bits Description
0 5-7 The SCSI command group.
0 0-4 The SCSI command code.
Chapter 2 SCSI Commands
Command Descriptor Blocks
table 13).
Control Byte
29.
3 2 1
Command Code
0
28