HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
59
• The HASHED DESTINATION SAS ADDRESS field contains the hashed value of the destination SAS address.
• The HASHED SOURCE SAS ADDRESS field contains the hashed value of the source SAS address.
•The TLR CONTROL field is not supported
•The RETRY DATA FRAMES is not supported
•The CHANGING DATA POINTER is not supported
• The NUMBER OF FILL BYTES field indicates the number of fill bytes between the INFORMATION UNIT field and
the CRC field. The RETRANSMIT bit is set to one for RESPONSE frames when attempting to retransmit this frame
due to receiving an error during the initial transmission. It shall be set to zero for all other frame types. The NUM-
BER OF FILL BYTES field shall be set to zero for all frame types except DATA frames
•. The TAG field contains a value that allows the SSP port to establish a context for commands and task management func-
tions.
• The TARGET PORT TRANSFER TAG field is set and used by the drive. The initiator should echo this field in out-
bound data IU.
• The INFORMATION UNIT field contains the information unit, the format of which is defined by the FRAME TYPE
field.
• Fill bytes shall be included after the INFORMATION UNIT field so the CRC field is aligned on a four byte boundary.
17.7.1 Command Information Unit
The COMMAND frame is sent by an SSP initiator port to request that a command be processed by the drive.
Table 32: COMMAND Information Unit
• The LOGICAL UNIT NUMBER field contains the address of the logical unit. The drive only supports a LUN of 0’s.
• A DISABLE FIRST BURST bit is not supported by the drive
• The TASK ATTRIBUTE field is defined as follows:
Byte Bit
76543210
0-7 Logical Unit Number
8 Reserved
9 Disable
first
burst=0
Reserved
Task
Attribute
10 Reserved
11 Additional CDB Length (in Dwords) Rsvd
12-27 CDB
28-n Additional CDB Bytes
Value Attribute
000b Simple_Q
001b Head_of_Q
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