Fujitsu MBC2036RC, MBC2073RC, MBA3300RC, MBA3147RC Response Data, Xferrdy information unit

SAS Interface

The drive checks for duplication of tags between multiple TASK frames or between a COMMAND frame and a TASK frame.

If a tag is found to be duplicated in the INIT, the drive sends the ACK primitive to temporarily close the connection. Then the drive reports the RESPONSE CODE of the OVERLAPPED TAG ATTEMPTED (0x0A).

∙CRC field

When a CRC error is detected, the drive sends the NAK primitive, and discards the TASK frame.

∙Frame length

When the IU length is other than 28 bytes, the drive reports INVALID

FRAME (Response Code=0x02).

∙LOGICAL UNIT NUMBER field

If this field is other than zero, the drive sets the response code to INVALID LOGICAL UNIT NUMBER (0x09), and sends the RESPONSE frame of

RESPONSE DATA.

∙TASK MANAGEMENT FUNCTION field

If this field is other than ABORT TASK, ABORT TASK SET, CLEAR TASK SET, LOGICAL UNIT RESET, or QUERY TASK, the drive sets the response code to TASK MANAGEMENT FUNCTION NOT SUPPORTED (0x04), and sends the RESPONSE frame of RESPONSE DATA.

1.6.2.3XFER_RDY information unit

Table 1.38 defines the transfer ready IU. The XFER_RDY frame is sent by an SSP TARG port to request write data from the SSP INIT port.

Table 1.38 XFER_RDY information unit

	Bit		6	5		4		3	2	1	0
Byte		7
0		(MSB)			REQUESTED OFFSET
3											(LSB)
4		(MSB)			WRITE DATA LENGTH
7											(LSB)
8							Reserved
11

The REQUESTED OFFSET field contains the application client buffer offset of the segment of write data that is sent to the SSP (initiator port as a logical unit). The requested offset is a multiple of four (i.e., each DATA frame begins transferring data on a dword boundary). The REQUESTED OFFSET field is always zero for the first XFER_RDY frame of a command (drives do not support the ENABLE FIRST BURST field of the COMMAND frame).

86 C141-C013