6-2.2 Mode Select Mc Command 15H; 6-2.2.1 Mode Select Cdb Description; Table 6-4. Mode Select Field Description - Fujitsu M2488 Product Manual

MEDIA CHANGER COMMANDS
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.
BYTES 7
0 0
1
2
3
4
5
Note: Changeable fields in the CDB are shaded.
BYTE BIT VALUE
0 0-7
1 0
1 4
4 0-7
6-6
6 5 4
0 0 1
LUN PF
Parameter List Length
Reserved

Table 6-4. MODE SELECT Field Description

15h Operation code.
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.
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.
>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.
CG00000-011503 REV. A
M2488 PRODUCT GUIDE
BITS
3 2
0 1
Reserved
Reserved
Reserved
DESCRIPTION
1 0
0 1
SP
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March 1997