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SAS Interface
82 C141-C013
ATTRIBUTE code is specified, a drive will treat the task as one with the SIMPLE
task attribute.
Table 1.35 TASK ATTRIBUTE field
Code Task attribute
000b SIMPLE
001b HEAD OF QUEUE
010b ORDERED
011b Reserved
100b ACA (not supported)
101b-111b Reserved
The ADDITIONAL CDB LENGTH field contains the length of the
ADDITIONAL CDB field in dwords (four bytes). A drive expects a max 64-byte
long COMMAND frame.
The CDB and ADDITIONAL CDB BYTES fields together contain the CDB to be
interpreted by the addressed logical unit.
The contents of the CDB are defined in the SCSI command standards (e.g.,
SPC-3).
When a drive receives a COMMAND frame, the following items are checked:
• HASHED DESTINATION SAS ADDRESS field
When this field contains a value different from the Hashed SAS address of
the drive, the drive sends the ACK and CREDIT_BLOCKED primitives, and
discards the COMMAND frame.
• HASHED SOURCE SAS ADDRESS field
When this field contains a value different from the SOURCE SAS
ADDRESS field of the OPEN frame, the drive sends the
CREDIT_BLOCKED primitive, and discards the COMMAND frame.