Quantum LTO 4, User Manual

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SCSI Commands: 22BMODE SELECT Page 79
Field Bytes Bits Description
Parameter List
Length 4 Specifies the number of bytes in the MODE SELECT parameter
list to be transferred from the host to the drive. A value of 0 is a
valid entry and indicates no data.
Reserved All reserved bits must be 0.
Control 5 See SCSI Command Control Byte Format on page 25.
A value in the Parameter List Length field that truncates a parameter list causes the
drive to return a Check Condition, and the REQUEST SENSE data is set to Illegal
Request.
3.10.1.3 MODE SELECT(10) Command Descriptor Block
Bits
Bytes
7 6 5 4 3 2 1 0
0 Operation Code (55h)
1 Ignored LUN PF Reserved
2 Reserved
3 Reserved
4 Reserved
5 Reserved
6 Reserved
7 (MSB)
8
Parameter List Length
(LSB)
9 Control
3.10.1.4 MODE SELECT(10) CDB Field Descriptions
Field Bytes Bits Description
Operation
Code 1 The Operation Code for MODE SELECT is 55h.
Ignored
Logical
Unit 1 5-7 The LUN field is vestigial from the SCSI-1 standard and is ignored.
PF 1 4 Always 1, indicating SCSI-2 format.
Parameter
List Length
7-8
Specifies the number of bytes in the MODE SELECT parameter list
to be transferred from the host to the drive. A value of 0 is a valid
entry and indicates no data.
Reserved All reserved bits must be 0.
Control 9 See SCSI Command Control Byte Format on page 25.
A value in the Parameter List Length field that truncates a parameter list causes the
drive to return a Check Condition, and the REQUEST SENSE data is set to Illegal
Request.