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1.6 Transport layer
C141-C013 79
Table 1.33 defines the FRAME TYPE field.
Table 1.33 FRAME TYPE field
Code Name of frame Information Unit Originator
Information unit size
(bytes)
01h DATA frame DATA INIT or TARG 1 to 1024
05h XFER_RDY
frame
Transfer ready SSP TARG port 12
06h COMMAND
frame
Command SSP INIT port 28 to 280
NO_DATA: 24
RESPONSE_DATA: 28
07h RESPONSE frame Response SSP TARG port
SENSE_DATA: 72
16h TASK frame Task
management
function
SSP INIT port 28
All others Reserved (unknown frame)
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 RETRY DATA FRAMES bit is set to one for XFER_RDY frames and shall
be set to zero for all other frame types. When set to one this bit specifies that the
SSP INIT port may retry write DATA frames that fail.
The RETRANSMIT bit is set to one for TASK frames, RESPONSE frames, and
XFER_RDY frames and shall be set to zero for all other frame types. This bit
specifies that the frame is a retransmission after the SSP port failed in its previous
attempt to transmit the frame.
The CHANGING DATA POINTER bit is set to one for DATA frames and shall
be set to zero for all other frame types. When set to one this bit specifies that the
frame is a retransmission after the SSP TARG port failed in its previous attempt
to transmit the frame or a subsequent frame and the dataoffset field of the frame
may not be sequentially increased from that of the previous frame.
The NUMBER OF FILL BYTES field specifies the number of fill bytes between
the INFORMATION UNIT field and the CRC field. The NUMBER OF FILL
BYTES field shall be set to zero for all frame types except DATA frames (i.e., all
other frame types are already four-byte aligned).