4-3.12 Mode Select Command 15H; 4-3.12.1 Mode Select Cdb Description; Table 4-42. Mode Select Field Description - Fujitsu M2488 Product Manual

M2488 PRODUCT GUIDE
4-3.12 MODE SELECT command 15h
The MODE SELECT command provides a means for the initiator to specify medium, logical unit,
and peripheral device parameters to the target by sending data relevant to such parameters in a
DATA OUT phase during 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 parameters kept by the controller is common to all initiators for a specific LUN. The
MODE SELECT command can be completed without error whether or not the LUN is ready. Buff-
ered write data is synchronized to tape prior to activating the new mode parameters.
4-3.12.1 MODE SELECT CDB Description
MODE SELECT is a six-byte command. The bytes are shown below and described in Table 4-42.
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.
VALU
BYTE BIT
E
0 0-7 15h
1 0
1 4 0 or 1
4 0-7
The Unit Attention/Mode Parameters Changed sense data will be reported to other initiators after a
Mode Select command if and only if the setting of at least one parameter was actually changed
from its previous setting. Therefore, issuing a Mode Select command with parameters that are the
April 1997
6 5 4
0 0 1
LUN PF
Parameter List Length
Reserved

Table 4-42. MODE SELECT Field Description

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 A 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.
A PF (Page Format) 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.
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 considered an error.
CG00000-011503 REV. A
TAPE UNIT SCSI COMMANDS
.
BITS
3 2
0 1
Reserved
Reserved
Reserved
DESCRIPTION
1 0
0 1
SP
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4-51