Fujitsu M2488 manual Mode Select MC command 15h, Mode Select Field Description

MEDIA CHANGER COMMANDS M2488 PRODUCT GUIDE

6-2.2 MODE SELECT MC command 15h

The MODE SELECT medium-changer command provides a means for the initiator to specify medium changer device parameters to the target by sending data relevant to such parameters in a data phase following the command. Initiators should issue MODE SENSE prior to MODE SELECT to determine supported pages, page lengths, and other parameters. A single set of Mode Select parame- ters kept by the controller are common to all initiators for a specific LUN. Buffered write data is syn- chronized to tape prior to activating the new mode parameters.

Mode Select parameters remain in effect until modified by another MODE SELECT command or until reset to their saved values following a power on sequence, SCSI bus reset, or SCSI device reset. Refer to the description of the Mode Sense command for an explanation of the different types of parameters (PC field).

6-2.2.1 MODE SELECT CDB Description

MODE SELECT is a six-byte command. The bytes are shown below and described in the follow- ing paragraphs. Common fields are described in paragraph 4-3.1 on page 4-4.

								BITS
BYTES	7	6	5		4				3	2	1		0
0	0	0	0		1				0	1	0		1
1
		LUN					PF			Reserved				SP
2								Reserved
3								Reserved
4
						Parameter List Length
5
				Reserved								Flag		Link

Note: Changeable fields in the CDB are shaded.

Table 6-4. MODE SELECT Field Description

BYTE	BIT	VALUE	DESCRIPTION
0	0-7	15h	Operation code.
1	0	0	A Save Pages (SP) bit of zero indicates the target shall perform the specified MODE
			SELECT operation, and shall not save any pages in non-volatile memory.
		1	An SP bit of one indicates that the target shall perform the specified MODE
			SELECT operation, and shall save to a non-volatile location all the savable pages
			sent during the DATA OUT phase.
1	4	0, 1	A PF bit of 0 or 1 both indicate that the Mode Select parameters are structured as
			pages of related parameters as defined by the ANSI standard.
4	0-7	>0	The parameter list length field specifies the length in bytes of the MODE SELECT
			parameter list to be transferred from the initiator to the target.
			A parameter list length of zero indicates that no data is transferred. This condition is
			not an error.

6-6 CG00000-011503 REV. A March 1997