4-3.13 Mode Sense Command 1Ah; 4-3.13.1 Mode Sense Cdb Description; Table 4-51. Mode Sense Field Description - Fujitsu M2488 Product Manual

TAPE UNIT SCSI COMMANDS
4-3.13 MODE SENSE command 1Ah
The MODE SENSE command provides a means for a target to report its medium, logical unit, or
peripheral device parameters to the initiator by sending the parameters during the data phase of this
command. The MODE SENSE command is a complementary command to the MODE SELECT
command.
4-3.13.1 MODE SENSE CDB Description
MODE SENSE is a six-byte command. The bytes are shown below and described in Table 4-51.
Common fields are described in paragraph 4-3.1 on page 4-4.
BYTES 7
0 0
1
2 PC
3
4
5
Note: Changeable fields in the CDB are shaded.
BYTE BIT VALUE
0 0-7
1 3
2 0-5
2 6-7
4 0-7
4-56
6 5 4
0 0 1
LUN Reserved
Allocation Length
Reserved

Table 4-51. MODE SENSE Field Description

1Ah Operation code.
1 The Disable Block Descriptor (DBD) bit value of 1 specifies that no block
descriptor is returned in the MODE SENSE data.
0 When this bit is set to 0, the target will return a block descriptor in the MODE
SENSE data.
The Page Code allows the initiator to select any one specific page or all of the
pages supported by a target. Pages are used to set and return device parameters.
Refer to the Page Code descriptions in Table 5-1 on page 5-1.
The Page Control (PC) field indicates the type of page parameter values to be
returned by the target. The PC field is defined in Table 4-52.
The Allocation Length specifies the number of bytes the initiator has allocated
for returned Mode Sense data. An Allocation Length of 00h indicates no Mode
Sense data is to be transferred; this condition is not considered an error.
CG00000-011503 REV. A
M2488 PRODUCT GUIDE
BITS
3 2
1 0
DBD
Page Code
Reserved
DESCRIPTION
1 0
1 0
Reserved
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April 1997