Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E 111
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Table 5.1.3.2-1. The Log Select command
Bit
7
6
5
4
3
2
1
0
Byte(s)
0
0
1
0
0
1
1
0
0
1
Logical Unit Num
Reserved
PCR
SP [2]
0
0
0
[1]
2
PC [3]
Reserved
3
Reserved
4
Reserved
5
Reserved
6
Reserved
7
(MSB)
Parameter List Length [4]
8
(LSB)
9
0
0
0
0
0
0
Flag [5]
Link [5]
[1] Parameter Code Reset (PCR). A PCR bit of one and a Parameter List Length of zero causes all imple-
mented parameters to be set to the drive-defined default values (most likely zero). If the PCR bit is one
and the parameter list length is greater than zero, the command is terminated 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 CDB. A PCR bit of Zero specifies that the log parameters shall not be reset.
[2] Save Parameters (SP) bit. An SP bit of one indicates that after performing the specified Log Select
operation the drive shall save to non-volatile memory all Log Select parameters identified as savable by
the DS bit in the Log parameter sections of the Log Page (see Table 5.1.3.2-3). An SP bit of zero specifies
that parameters shall not be saved. Log Parameters are also saved after each thermal calibration if the
TSD bit in the Log Parameter pages (see Table 5.1.3.2-4) is zero.
It is not an error to set the SP bit to one and to set the DS bit of a log parameter to one. In this case, the
parameter value for that log parameter is not saved.
[3] Page Control field (PC). This field defines the type of log parameter the initiator selects to change with
the Log Select Command. The PC field is defined in Table 5.1.3.2-2.
Table 5.1.3.2-2. Page Control Field
PC Field
Value
Type of Log Parameter
00b
Log Current Threshold Values
01b
Log Current Cumulative Values
10b
Log Default Threshold Values
11b
Log Default Cumulative Values
The drive only updates the cumulative values to reflect the number of events experienced by the drive,
but the initiator can set the threshold or cumulative log (00 or 01) parameter values using the Log Select
command with the PC field set as applicable.
The drive sets the current log values to default values in response to a Log Select command with the
parameter list length set to zero and the PC field set to the applicable value (10 or 11) per Table
5.1.3.2-2.
