OEM MANUAL:K6602771
6 COMMAND DESCRIPTIONS
Revision: 2 / Date: 2002.12.19
Page: 291 / 313
6.40 XDREAD:(52
H
)
Bit
Byte
7
6
5
4
3
2
1
0
0
Operation Code(52
H
)
0
1
0
1
0
0
1
0
1
Logical Unit Number
Reserved
0
0
0
0
0
2
Logical Block Address (MSB)
3
Logical Block Address
4
Logical Block Address
5
Logical Block Address (LSB)
6
Reserved
0
0
0
0
0
0
0
0
7
Transfer Length (MSB)
8
Transfer Length (LSB)
9
Vendor Unique
Reserved
Flag
Link
0
0
0
0
0
0
The XDREAD command requests that the target transfer to the initiator the XOR
data generated by an XDWRITE command.
The XOR data transferred is identified by the Logical Block Address and the Transfer
Length. The Logical Block Address and the Transfer Length shall be the same as
those specified in a prior XDWRITE command. If a match is not found, the command
is terminated with CHECK CONDITION status and the sense key is set to ILLEGAL
REQUEST with the additional sense code set to INVALID FIELD IN CDB.
The Logical Block Address specifies the starting logical block to write by this
command.
The Number of Blocks specifies the number of consecutive logical blocks to be
written.
The Number of Blocks of 0 specifies to continue writing till the last available logical
block.
XDREAD:(52h)