SCSI Commands
Page
39
Field
Bytes
Bits
Description
Control
9
See Control Byte Format on page 18.
Note:
Pages 00h, 0Ch, 30h, and 31h cannot be reset by Log Select.
The drive does not maintain a separate set of log parameters for each initiator.
Therefore, a Log Select command affects all initiators.
Note:
The subsequent section discusses the Log Sense command. The log page
codes and the log parameter codes are described in that section.
Log Pages
A log page is made up of a four-byte page header and one or more log parameters.
A log parameter is made up of a four-byte parameter header and one or more
associated parameter data bytes.
The following table shows the log page header format.
Byte
Bits
7
6
5
4
3
2
1
0
0
Reserved
Page Code
1
Reserved
2
Page Length, MSB
3
Page Length, LSB
Field Descriptions
Field
Bytes
Bits
Description
Page
Code
0
0-5
Identifies the page.
Page
Length
2-3
Indicates the length of log parameters (in bytes) which follow the
page header.
Reserved
All reserved bits must be 0.
Log Parameter
The following table shows a typical log parameter format.
Byte
Bits
7
6
5
4
3
2
1
0
0
Parameter Code, MSB
1
Parameter Code, LSB
2
DU
DS
Reserved
3
Parameter Length (n-3)
4
Parameter Value
n
Parameter Value
Field Descriptions
Field
Bytes
Bits
Description
Parameter
Code
0-1
Identifies the log parameter. Log Parameters are always in ascend-
ing order.
