Quantum LTO 4, User Manual

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SCSI Commands: 36BREPORT DEVICE IDENTIFIER Page 158
3.24 REPORT DEVICE IDENTIFIER
The host uses this command to retrieve the Device Identifier. The Device Identifier is
set using the SET DEVICE IDENTIFIER command and shall persist through power
cycles.
3.24.1 REPORT DEVICE IDENTIFIER Command Descriptor Block
The following table shows the layout of the CDB.
Byte Bits
7 6 5 4 3 2 1 0
0 Operation Code (A3h)
1 Ignored LUN Service Action (05h)
2 Reserved
3 Reserved
4 Reserved
5 Reserved
6 (MSB)
7
8
9
Allocation Length
(LSB)
10 Reserved
11 Control
3.24.1.1 REPORT DEVICE IDENTIFIER Command Field
Descriptions
Field Bytes Bits Description
Operation
Code 0 The Operation code for REPORT DEVICE IDENTIFIER is A3h.
Ignored
Logical Unit 1 5-7 The LUN field is vestigial from the SCSI-1 standard and is
ignored.
Service
Action 1 0-4 The Service Action field is 05h and identifies the function to be
performed under the more general command function
specified in the operation code.
Allocation
Length 6-9 Specifies the amount of data to be returned, in bytes.
Reserved All reserved bits must be 0.
Control 11 See SCSI Command Control Byte Format on page 25.
3.24.2 REPORT DEVICE IDENTIFIER Data
The following data is returned by the REPORT DEVICE IDENTIFIER command.
Byte Bits
7 6 5 4 3 2 1 0
0 (MSB)
3
Identifier Length (n-3)
(LSB)
4
n
Identifier