Fujitsu M2488 manual Mode Select Parameter Header, Mode Select Mode Parameter Header, Descriptors

M2488 PRODUCT GUIDE MEDIA CHANGER COMMANDS

MODE SELECT Parameter Header

The four bytes of the Mode Parameter Header are shown in Table 6-6.

Table 6-6. MODE SELECT Mode Parameter Header

						BITS
BYTES	7	6	5		4		3	2	1	0
0						Reserved
1						Reserved
2						Reserved
3				Block Descriptor Length (00h)

The block descriptor is not supported for the Medium Changer so its length must be specified as 00h.

Page Descriptors

Following the parameter list header are the MODE SELECT pages.

Table 6-7. Page Descriptors

					BITS
BYTES	7	6	5	4		3	2	1	0
0	PS=0	Reserved				Page Code
1				Additional Page Length
2-N			Page Defined or Vendor Unique Parameter Bytes

			Table 6-8. Page Descriptor Field Description
BYTE	BIT	VALUE		DESCRIPTION
0	0-5			The Page Code field identifies the format and parameters for that page. For Medium
				Changer LUNs, this controller supports page 1Dh (Element Address Assignments),
				1Eh (Transport Geometry Parameters), 1Fh (Device Capabilities Page), and 00h
				(Vendor Unique Parameters)
0	7	0		When using a MODE SELECT command, the PS (Parameters Savable) bit is
				reserved and must be zero.
1	0-7			The additional page length indicates the number of bytes in that page. The additional
				page length field value does not include bytes 0 and 1 of that page (the page code
				and additional page length fields, respectively).

If the initiator sends an incorrect length in the Page Length field or sends page fields with values that are not supported by the target or are not changeable, the target returns a CHECK CONDI- TION status with the sense key field set to ILLEGAL REQUEST in the sense data. In this case, no parameters are changed by this command.

March 1997 CG00000-011503 REV. A 6-9