4-3.23 Request Sense Command 03H; 4-3.23.1 Request Sense Cdb Description; Table 4-99. Request Sense Field Description - Fujitsu M2488 Product Manual

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M2488 PRODUCT GUIDE
4-3.23
REQUEST SENSE command 03h
The REQUEST SENSE command requests that the target transfer sense data to the initiator. The con-
troller is capable of supplying 44 bytes (2Ch bytes) of sense. Refer to section 8-3 on page 8-4 for a
description of the sense data received via this command.
4-3.23.1
REQUEST SENSE CDB Description
REQUEST SENSE is a six-byte command as shown below and described in Table 4-99. 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
4
0-7
4-3.23.2
REQUEST SENSE CHECK CONDITION Status
The sense data is valid for a CHECK CONDITION status returned on the prior command. This
sense data is preserved by the target for the initiator until retrieved by the REQUEST SENSE com-
mand or until the receipt of any other command for the same logical unit from the initiator that
issued the command resulting in the CHECK CONDITION status. Sense data is cleared upon
receipt of any subsequent command (including Request Sense) to the logical unit from the initiator
receiving the CHECK CONDITION status.
The REQUEST SENSE command returns the CHECK CONDITION status only to report fatal
errors for the REQUEST SENSE command.
April 1997
6
5
4
0
0
0
LUN
Allocation Length
Reserved

Table 4-99. REQUEST SENSE Field Description

03h
Operation code.
The Allocation Length field specifies the maximum number of sense data bytes
to be returned to the initiator. An allocation length of zero indicates that no sense
data is returned and is not considered an error. The target terminates the sense
data transfer when the allocation length bytes have been transferred or when all
of the sense data have been transferred to the initiator, whichever is less.
The additional sense length in the sense data is not altered to reflect truncation
due to insufficient allocation length.
CG00000-011503 REV. A
TAPE UNIT SCSI COMMANDS
BITS
3
2
0
0
Reserved
Reserved
Reserved
DESCRIPTION
1
0
1
1
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