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6.Command Specification MODE SELECT
6-40 SONY AIT-5 drive SDX-1100V series Ver.1.0
6.7. MODE SELECT(6/10) 15h and 55h
Mode Select (6) CDB Format:
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (15h)
1 Reserved PF Reserved SP (0)
2 Reserved
3 Reserved
4 Parameter List Length
5 Control
Mode Select (10) CDB Format:
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (55h)
1 Reserved PF Reserved SP (0)
2 Reserved
3 Reserved
4 Reserved
5 Reserved
6 Reserved
7 Parameter List Length (MSB)
8 Parameter List Length (LSB)
9 Control
The MODE SELECT (6/10) commands enable the initiator to configure the drive. Similarly MODE SENSE enables
the initiator 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
initiator and the drive. Before configuring the drive, the initiator will issue a MODE SENSE. This allows the drive to
return its current configuration and indicate what parameters are configurable. The initiator interprets this
information and may then issue a MODE SELECT command to set up the drive to the initiator’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 will be read in conjunction.
MODE SELECT allows the initiator to specify configuration parameters to the drive.
PF: The Page Format bit indicates that the data sent by the initiator after the MODE SELECT header and block
descriptors complies with the definition of pages as set out in SCSI-2 or SCSI-3.
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.
Parameter List Length: This specifies the length, in bytes, of the MODE SELECT parameter list that is
transferred during the DATA OUT phase. A ZERO parameter list length indicates that no data is transferred. The
Parameter List length must be a value which coincides with header, block descriptor or page boundaries. If this
does not occur then the drive will return a CHECK CONDITION status with an ILLEGAL REQUEST sense key set.