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SCSI Interface Product Manual, Rev. B
The LOG SENSE command and its DATA IN phase use the format of Table 110. Explanations pertaining to the
table apply generally to both LOG SELECT and LOG SENSE commands, with differences noted. However,
only one log page at a time is returned with each LOG SENSE command (see Section 8.9). This table is not
given in Section 8.8, though it applies.
Table 110:
Log Page format
Bit
7
Byte
0
Reserved
1
Reserved
2
(MSB)
3
LOG PARAMETER (First) [4]
4 to
x+3
(Length X bytes)
:
: [4]
LOG PARAMETER (Last) [4]
n-Y
to n
(Length Y bytes)
[1]
PAGE CODE. Refer to Table 113.
[2]
The PAGE LENGTH field gives the total number of bytes of LOG PARAMETER structures that follow
these first four control block bytes. If the initiator sends a PAGE LENGTH that results in the truncation of
any parameter, the target shall terminate the command with CHECK CONDITION status. The sense key
shall be set to ILLEGAL REQUEST with the additional sense code set to Invalid Field In Parameter List.
[3]
Most log pages contain one or more special data structures called Log Parameters. Log Parameters may
be data counters that record a count of a particular event (or events) or list parameters (strings) that con-
tain a description of a particular event. List parameters are not currently supported by the drives repre-
sented by this manual.
[4]
Each LOG PARAMETER structure begins with a four-byte parameter header followed by one or more
bytes of parameter value data. LOG PARAMETER structures are in the format given in Table 111.
Table 111:
Log Parameters
Bit
7
Byte
0
(MSB)
1
2
DU [2]
3
PARAMETER LENGTH (n-3 bytes) [8]
4
– –
:
– –
n
[1]
The PARAMETER CODE field identifies the specific parameter that is being transferred with the Log
Page. These codes are listed and explained in the individual page code descriptions following Table 113.
Byte 2 is referred to as the PARAMETER CONTROL byte. The meanings of the various fields are dis-
cussed in notes [2] through [7]. For a LOG SELECT command, these bits perform a control function, but
on a LOG SENSE command, they only report the drive settings of these bits in this same format on the
Data In part of the LOG SENSE command.
6
5
PAGE LENGTH (n-3) [2]
Log Parameter Structure(s) [3]
6
5
PARAMETER CODE [1]
DS [3]
TSD [4]
PARAMETER VALUE [9]
4
3
PAGE CODE [1]
4
3
ETC [5]
TMC [6]
2
1
(LSB)
2
1
(LSB)
Reserved
LP [7]
175
0
0
– –
– –
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