Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
75
 FRAME TYPE field, which defines the format of the INFORMATION UNIT field as follows:
Table 41 FRAME TYPE Field
Code
Name of Frame
Information Unit
Originator
IU Size (bytes)
01h
DATA
Data
Initiator or Target
1-1024
05h
XFER_RDY
Data Transfer
Ready
Target 12
06h
COMMAND
Command
Initiator
28-284
07h
RESPONSE
Response
Target
24-1024
16h
TASK
Task Management
Function
Initiator 28
f0-ffh
Vendor Specific
all others
Reserved
 Hashed Destination SAS Address contains the hashed value of the destination SAS address
 Hashed Source SAS Address contains the hashed value of the source SAS address
 TLR Control is not supported
 Retry Data Frames is not supported
 Changing Data Pointer is not supported
 Number of Fill Bytes 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 Number of Fill
Bytes field shall be set to zero for all frame types except DATA frames
 Tag field contains a value that allows the SSP port to establish a context for commands and task management
functions
 Target Port Transfer Tag is set and used by the drive. The initiator should echo this field in outbound data IU.
 Information Unit 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.