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Page 18
Field Descriptions
Operation Code Format
Field Descriptions
Control Byte Format
Field Descriptions
Field
Byte
Bits
Operation
0
Code
Ignored
1
5-7
Logical
Unit
Command
1
0-4
Dependent
2-4
2-8
Reserved
Control
Last
Fields that are one byte or longer have no entry in the Bits column.
Bits
Byte
7
6
0
Group Code
Field
Byte
Bits
Group
0
5-7
Code
Command
0
0-4
Code *
NOTE: The Group Code and Command Code together make the Operation Code.
Bits
Byte
7
6
Last
Vendor Unique
Field
Byte
Bits
Vendor
Last
6-7
Unique
Reserved
Last
2-5
Flag and
Last
0-1
Link bits
Description
The Operation Code is made up of the Group Code and the Com-
mand Code. See Operation Code Format, below.
The LUN field is residual from the SCSI-1 days and is ignored.
See the specific command.
All reserved bits must be 0.
The Control byte is made up of the Vendor Unique, Flag and Link
bits. See Control Format, below.
5
4
3
Command Code
Description
The SCSI command group.
The SCSI command code.
5
4
3
Reserved
Description
Not used, always 0.
All reserved bits must be 0.
These bits are not supported by the Viper drive.
LTO SCSI Interface Manual
2
1
0
2
1
0
Flag
Link
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