Xdwriteread (32) Command - Seagate 77767496 Product Manual

12.73

XDWriteRead (32) command

The XDWriteRead (32) command requests that the target xor the data transferred (data-out) with the data on
the medium and return the resulting xor data (data-in). This is the equivalent to an XDWrite (32) command fol-
lowed by an XDRead (32) command with the same Logical Block Address and Transfer Length. This command
is only available on transport protocols supporting bidirectional commands.
Table 238: XDWriteRead (32) command (7Fh)
Bit 7
Byte
0 0
Control
1
2
Reserved
:
6
Additional CDB Length
7
8 (MSB)
9
10
Reserved
11
12 (MSB)
13
14
15
16
17
18
19
20
Reserved
:
27
28 (MSB)
29
30
31
Field definitions (listed alphabetically)
Table
number
Additional CDB Length
238
The Additional CDB Length field indicates the number of additional CDB bytes. This value in the Additional CDB Length
field shall be a multiple of 4. If the number of CDB bytes delivered by the service delivery subsystem is not sufficient to con-
tain the number of bytes specified by the Additional CDB Length field, the command shall be terminated with a Check Con-
dition status. The sense key shall be set to Illegal Request and the additional sense code shall be set to Invalid Field in
CDB.
350
7Fh
6 5
1 1
Reserved
4 3
1 1
Service Action (0007h)
DPO FUA
Logical Block Address
Transfer Length
Fibre Channel Interface Manual, Rev. D
2 1
1 1
Disable Reserved
Write
0
1
(LSB)
(LSB)
(LSB)