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LOG SENSE
Bit
7
Byte
0
Reserved
1
2
(MSB)
3
4
x+3
n-y
n
Page code: Identifies which page of data is being transferred. If the Page Code field value is reserved or not
implemented by the target, the target shall terminate the command with a CHECK CONDITION status. The sense
key shall be set to ILLEGAL REQUEST, and the additional sense code shall be set to INVALID FIELD IN
PARAMETER LIST.
Page Length: The Page Length field indicates the total number of bytes that follow this byte. The value returned for
this field depends on the value you specified for the Page Code and the Parameter Pointer in the CDB. This value is
independent of what you specified for the Allocation Length. A Page Length value that results in the truncation of any
parameter shall cause the target to terminate the command with CHECK CONDITION status. The sense key shall
be set to ILLEGAL REQUEST and the additional sense code shall be set to INVALID FIELD IN PARAMETER LIST.
6.6.2. The Log Parameter Descriptor
Most log pages contain one or more special data structures called log parameters. These may be data counters
which record the occurrence of certain events, or they may be more complex structures which describe activities or
other events which occur within the device. Each parameter structure begins with a 4-byte parameter header
followed by one or more bytes of parameter structure data. The 4-byte header is shown below:
Bit
7
Byte
0
(MSB)
1
2
DU
3
4
n
Parameter Code: Identifies which parameter of data is being transferred. If the parameter code value is reserved or
not implemented by the target, then the target shall terminate the command with CHECK CONDITION status. The
sense key shall be set to ILLEGAL REQUEST and the additional sense code shall be set to INVALID FIELD IN
PARAMETER LIST.
The DU, DS, TSD, ET, TMC, and LP fields are collectively referred to as the control byte.
DU: The DU bit (Disable Update) is not defined for threshold values (indicated by the PC field of the LOG SENSE
command descriptor block). The target shall ignore the value of any DU bits in a LOG SELECT command.
DS: The DS (Disable Save) bit informs the initiator that savable parameters are disabled (i.e. not supported), and
should always be 1. If it is 0 the command will terminate with CHECK CONDITION status with sense key set to
ILLEGAL REQUEST and additional sense code of ILLEGAL FIELD IN PARAMETER LIST.
SONY AIT-4 drive SDX-900V series Ver.2.1
Table 6-10: Log Page Format
6
5
Page Length (n-3)
Log Parameters (s)
The First Log Parameter
The Last Log Parameter
Table 6-11: Log Parameter
6
5
Parameter Code
DS (1)
TSD
ETC (0)
Parameter Length (n-3)
Parameter Value
4
3
2
Page Code
Reserve
(Length x)
.
.
.
(Length y)
4
3
2
TMC (00)
6.Command Specification
1
0
(LSB)
1
0
(LSB)
LBIN
LP
6-15
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