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Chapter 4 SCSI Commands
REPORT SUPPORTED OPERATION CODES Command (A3h/0Ch)
DLT-S4 Interface Reference Guide
298
Figure 152 All_commands
Command Descriptor — Data
Format
Table 165 All_commands
Command Descriptor
—
Field
Descriptions
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation Code
1
Reserved
2 — 3
(MSB)
Service Action
(LSB)
4
Reserved
5
Reserved
ServActV
6 — 7
(MSB)
CDB Length
(LSB)
Field
Description
Operation Code The operation code of the returned command.
Service Action
The service action of the returned command. If the
command does not have service actions, this field is
set to 00h.
ServActV
Service Action Valid. When set to 0, indicates that
the returned command does not have service actions
and that the Service Action field should be ignored.
When set to 1, indicates that the returned command
has service actions and that the Service Action field
contains valid information.
CDB Length
Contains the length of the CDB indicated by the
Operation Code and, if the ServActV bit is set to 1,
the Service Action fields.