Fujitsu MBA3147RC, MBC2036RC Transport layer, Frame Type field, Nodata, Responsedata, Sensedata

1.6 Transport layer

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	Transfer ready	SSP TARG port	12
	frame
06h	COMMAND	Command	SSP INIT port	28 to 280
	frame
07h	RESPONSE frame	Response	SSP TARG port	NO_DATA: 24
				RESPONSE_DATA: 28
				SENSE_DATA: 72
16h	TASK frame	Task	SSP INIT port	28
		management
		function
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).

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