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LOG SELECT Command (4Ch) SDLT 600 SCSI Interface Guide

4-32 January 2005 81-81200-02 REV A01

Table 4-18. LOG SELECT Command Descriptor Block — Field Descriptions

Field Name 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 32 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. (See the Note

under SP [Save Parameters] below.)

SP Save Parameters. When set to 1, indicates that after performing the specified

LOG SELECT operation the drive saves to nonvolatile memory all parameters

identified as saveable by the DS bit in the log page. When set to 0, specifies

that the drive does not save the parameters.

Note: If PCR and SP are both set to 1, the drive terminates the command with

a CHECK CONDITION status, Sense Key set to ILLEGAL REQUEST,

and Additional Sense Code set to INVALID FIELD IN CDB.

PC Page Control. Defines the type of parameter values to be selected:

Code Type of Parameter Value

00b Current Threshold Values

01b Current Cumulative Values

10b Default Threshold Values

11b Default Cumulative 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 the DATA OUT phase. A

Parameter List Length of 0 indicates that no data is to be transferred. This

condition is not considered an error.

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