Chapter 4 SCSI Commands
LOG SELECT Command (4Ch)
DLT-S4 Interface Reference Guide
58
Table 33
LOG SELECT
Command Descriptor Block —
Field Descriptions
Field
Description
PCR
Parameter Code Reset. If this bit is set to 1 and the Parameter List Length field is
set to 0, all accumulated values of page codes 2, 3, and 0C are set to 0 and all
threshold values are set to default. If PCR is set to 1 and the Parameter List Length
field is set to a non-zero value, the drive terminates the command with
CHECK
CONDITION
status, Sense Key set to
ILLEGAL REQUEST
, and Additional Sense Code
(ASC) set to
INVALID FIELD IN CDB
.
SP
Save Parameters. Must be set to 0.
PC
Page Control. Defines the type of parameter values to be selected:
Code
Types of Parameter Value
00b
Current Threshold Values
01b
Current Threshold Values
10b
Default Threshold Values
11b
Default Threshold Values
When the PC field is set to 10b and the Parameter List Length field is set to 0, all
Current Threshold Values are reset to the Default Threshold Values. When the PC
field is set to 11b and the Parameter List Length field is set to 0, all Current
Cumulative Values are reset to the Default Cumulative Values. This is equivalent
to clearing all log pages that can be cleared.
Note:
The drive ignores the PC field value if the PCR bit is set to 1.
Parameter List
Length
Specifies the length, in bytes, of the
LOG SELECT
parameter list to be transferred
from the initiator to the drive during
DATA OUT
.
A Parameter List Length of 0 indicates that no data is to be transferred. This
condition is not considered an error.
