Table 1.35 Task Attribute Field - Fujitsu MAU3147RC SERIES Technical Manual

Serial Attached SCSI (SAS) Interface
ATTRIBUTE code is specified, a drive will treat the task as one with the SIMPLE
task attribute.
The ADDITIONAL CDB LENGTH field contains the length of the
ADDITIONAL CDB field in dwords (four bytes). However, drives do not
support this ADDITIONAL CDB LENGTH field. Therefore, a drive expects a
28-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.
1-62

Table 1.35 TASK ATTRIBUTE field

Code
000b SIMPLE
001b HEAD OF QUEUE
010b ORDERED
011b Reserved
100b ACA (not supported)
101b-111b Reserved
Task attribute
C141-C009