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MODE SELECT
7.7.
MODE SELECT 15h
Bit
7
Byte
0
1
2
3
(MSB)
4
5
6
7
8
9
10
11
MODE SELECT enables the Host to configure the drive. Similarly MODE SENSE enables the Host to identify
which configuration parameters the drive supports and what its current configuration is. Implementing MODE
SELECT and MODE SENSE requires a certain amount of "handshaking" between the Host and the drive. Before
configuring the drive, the Host should issue a MODE SENSE. This allows the drive to return its current
configuration and indicate what parameters are configurable. The Host interprets this information and may then
issue a MODE SELECT command to set up the drive to the Host's preferred configuration.
Note: In the MODE SELECT and MODE SENSE (operation code 1Ah) descriptions much of the information
overlaps and therefore the two descriptions should be read in conjunction.
The MODE SELECT command provides a means to specify medium or Device parameters. MODE SENSE should
be issued prior to MODE SELECT to determine supported pages, page lengths, and other parameters.
The drive always powers-up with its default configurations set. This is also true, if the drive receives a Software
Reset, or a Hardware Reset.
PF: The Page Format bit indicates that the data sent by the Host after the MODE SELECT header and block
descriptors complies with the definition of pages as set out in SCSI-2.
SP: The Save Parameters bit instructs the drive to save all savable pages. This bit is not supported and the drive
will return a CHECK CONDITION status with an ILLEGAL REQUEST sense key, if it is set.
The Parameter List Length field specifies the length in bytes of the MODE SELECT parameter list that shall be
transferred to the Device as data. A Parameter List Length of zero indicates that no data shall be transferred.
This condition shall not be considered as an error. A Parameter List Length that results in the truncation of any
descriptor, header or page of parameter shall cause the Device 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
PARAMETER LIST LENGTH ERROR.
The Device shall terminate the MODE SELECT command with "Check Condition" status, set the Sense Key to
ILLEGAL REQUEST and set the Additional Sense Code to INVALID FIELD IN PARAMETER LIST for the
following conditions:
1.
An attempt to send an unsupported value in the MODE SELECT header, block descriptor, or any page
header.
2.
An attempt to send a page with a length not equal to the parameter length reported for that page by the
MODE SENSE command.
3.
An attempt to send a value for a parameter that is outside the range supported by the Device and rounding is
not implemented for that parameter.
SONY AIT-2 Turbo drive SDX-570V series Ver.1.0
6
5
Operation Code (15h)
Reserved
Parameter List Length
7. ATAPI Packet Command Specification
4
3
2
PF
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1
0
SP (0)
(LSB)
7-23
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