M2488 PRODUCT GUIDE
TAPE UNIT SCSI COMMANDS
April 1997
CG00000-011503 REV. A
4-51
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
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
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 4-42. MODE SELECT Field Description
BYTE
BIT
VALU
E
DESCRIPTION
0
0-7
15h
Operation Code.
1
0
0
1
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.
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.
1
4
0 or 1
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.
4
0-7
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.
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