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5.23 REQUEST SENSE:(03
Bit
Byte
0
1
Logical Unit Number
2
3
4
5
Vendor Unique
The REQUEST SENSE command returns the sense data of the unit describing the
CHECK CONDITION status indicated to the host computer. The sense data is held
pending in the controller so that it may be transferred to the host computer.
This sense data is cleared when the unit in the check state receives a new command
from the host computer that received the CHECK CONDITION status.
The allocation length specifies the number of bytes to be allocated by the host
computer for the sense data to be transferred. The other allocation length values
specify the maximum number of bytes to be transferred. The controller terminates
the Data In phase when it has transferred the number of sense data bytes specified
by the allocation length or all sense data bytes, whichever is shorter.
This command returns the Check Condition status only when one of the following
fatal errors occurs
· The controller receives a non-zero reserved bit n the CDB.
· The controller detects an unrecoverable parity error on the data bus.
· The sense data transfer is prevented by a controller error.
The sense data transferred when a fatal error occurred during a REQUEST SENSE
command is invalid.
The sense data transferred by this SCSI controller is all in the extended sense format
(see Chapter 6, "SENSE DATA" for the extended sense data).
REQUEST SENSE:(03h)
5 COMMAND DESCRIPTIONS
)
H
7
6
5
0
0
0
0
0
0
0
0
0
0
0
0
4
3
Operation Code (03
H
0
0
Reserved
0
0
Reserved
0
0
Reserved
0
0
Allocation Length
Reserved
0
0
OEM MANUAL:K6602924
2
1
)
0
1
0
0
0
0
0
0
Flag
Link
0
Revision: 1 / Date: 2003.03.06
Page: 223 / 273
0
1
0
0
0
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