Mode Select Parameters - Seagate Viper 200 Scsi Interface Manual

Page 52
10-Byte Command Descriptor Block
Field Descriptions

Mode Select Parameters

Field Bytes Bits
Control 5
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.
Bits
Byte 7 6
0
1 Ignored LUN
2
3
4
5
6
7
8
9
Field Bytes Bits
Operation 1
Code
Ignored 1 5-7
Logical
Unit
PF 1 4
Parameter 7-8
List Length
Reserved
Control 9
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.
The Mode Select parameter list, for both the 6-byte CDB and 10-byte CDB versions
is in the following general format:
Mode Parameter Header
Block Descriptor
Mode Parameter Pages
Description
See Control Byte Format on page 18.
5 4 3
Operation Code (55h)
PF Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Parameter List Length, MSB
Parameter List Length, LSB
Control
Description
The Operation Code for Mode Select is 55h.
The LUN field is residual from the SCSI-1 days and is ignored.
Always 1, indicating SCSI-2 format.
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 en-
try and indicates no data.
All reserved bits must be 0.
See Control Byte Format on page 18.
The Mode Parameter Header is required.
The Block Descriptor is optional.
Zero or more Mode Parameter Pages may be
included.
LTO SCSI Interface Manual
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