Specifications

ATAPI For Streaming Tape QIC-157 Rev B
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Table 6-23 Log Parameter
Bit
Byte
7 6 5 4 3 2 1 0
0 (MSB) Parameter Code
1 (LSB)
2 0 (DU) 1 (DS) 0 (TSD) 0 (ETC) 00 (TMC) Reserved 0 (LP)
3 Parameter Length (n-3)
4 Parameter Value
n
Each log parameter begins with a four-byte parameter header followed by one or more bytes of
Parameter Value data.
[Editor's Note: Due to hardware restrictions all parameter values should be padded to a multiple of
4.]
The Parameter Code field identifies which log parameter is being transferred for that log page.
A Disable Save (DS) bit of one indicates that the Device does not support saving that log parameter in
response to a LOG SELECT command with a SP bit of one.
The Parameter Length field specifies the length in bytes of the following parameter value. If the
Host sends a Parameter Length value that results in the truncation of the Parameter Value, the
Device 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.
Implementor's Note:
1. For log page codes 02h and 03h, the parameter length field shall be set to 4 and thus the Parameter Value shall be 4
bytes long.
2. For log page code 30h, the parameter length field shall be set to 8 and thus the Parameter Value shall be 8 bytes
long.
6.8.6.29.Supported Log Pages Code 00h
The supported log page returns the list of log pages implemented. Devices that implement the LOG
SENSE command shall implement this log page.
Table 6-24 Supported Log Page
Bit
Byte
7 6 5 4 3 2 1 0
0 Reserved Page Code (00h)
1 Reserved
2 (MSB) Page Length (n-3)
3 (LSB)
4 Supported Page List
n
This page is not defined for the LOG SELECT command. This log page returns the list of supported
log pages.