Table of Contents
Advertisement
SCSI Commands
10-Byte Command Descriptor Block
Field
Bytes
Bits
PC
2
6-7
Page
2
0-5
Code
Allocation
4
Length
Reserved
Control
5
Bits
Byte
7
6
0
1
Ignored LUN
2
PC
3
4
5
6
7
8
9
Field Descriptions
Field
Bytes
Bits
Operation
0
Code
Ignored
1
5-7
Logical
Unit
DBD
1
3
Description
Page Control specifies the type of values to be returned.
00b = Report current values.
01b = Report changeable values. Any bit that can be changed by
Mode Select is set to 1; otherwise, the bits are set to 0.
10b = Report default values. Returns the power-up, or reset, values.
11b = Report saved values. Returns the power-up, or reset, values.
The Page Code selects the page or pages to be returned by the
drive.
00h = Return only the Parameter List Header/Block Descriptor
02h = Return the Disconnect/Reconnect Page
0Ah = Return the Control Mode Page
0Fh = Return the Data Compression Control Page
10h = Return the Device Configuration Page
1Ch = Return the Information Exceptions Page
21h = Return the Drive Capabilities Page
22h = Return the Interface Control Page
3Fh = Return all available pages in ascending order starting from
page 02h
Specifies the number of bytes the host has allocated for returned
Mode Sense data. The drive will not return more than this amount of
data. A value of 0 is a valid entry and indicates no data.
All reserved bits must be 0.
See Control Byte Format on page 18.
5
4
3
Operation Code (5Ah)
Reserved
DBD
Page Code
Reserved
Reserved
Reserved
Reserved
Allocation Length, MSB
Allocation Length, LSB
Control
Description
The Operation Code for the 6-byte version of Mode Sense is 1Ah.
The LUN field is residual from the SCSI-1 days and is ignored.
0 = Return the block descriptor in the Mode Sense data.
1 = Disable Block Descriptors (DBD).
NOTE: When the DBD is 1, the Block Descriptor Length in the pa-
rameter header is 0.
Page 65
2
1
0
Reserved
Advertisement
Table of Contents
