Seagate Ultra160 Product Manual page 290

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[3] The SOURCE DESCRIPTORS identify the source device target identifiers and starting LOGICAL BLOCK
ADDRESSes on those devices for the REGENERATE or REBUILD operation. See Table 203 for the
source descriptor format.
[4] The PAD field contains invalid data and shall be ignored.
Note. The PAD field is included to accommodate initiators which require the intermediate data to be
aligned on a particular memory boundary.
[5] The INTERMEDIATE DATA field contains data that shall be used in the Xor operation with the data from
the specified source devices. The length of the data is equal to the REBUILD/REGENERATE length multi-
plied by the block size.
Table 203: Source Descriptor format
Bit 7
Byte
0 (MSB
:
7
8 (MSB
:
11
12 (MSB
:
15
[1] The SOURCE DEVICE ADDRESS field specifies a SAM-compliant target identifier of a device that is a
data source.
[2] The SOURCE STARTING LOGICAL BLOCK ADDRESS field indicates the starting LOGICAL BLOCK
ADDRESS to use when reading data from the source specified in the SOURCE DEVICE ADDRESS field.
6 5
SOURCE DEVICE ADDRESS [1]
SOURCE STARTING LOGICAL BLOCK ADDRESS [2]
SCSI Interface Product Manual, Rev. B
4 3
Reserved
2 1
(LSB)
(LSB)
(LSB)
0