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SAS Interface
92 C141-C013
1.6.2.5 RESPONSE information unit
Table 1.41 defines the response IU. The RESPONSE frame is sent by an SSP
TARG port to deliver SCSI status (e.g., GOOD or CHECK CONDITION) and
sense data, or to deliver SSP-specific status (e.g., illegal frame format). The
maximum size of the RESPONSE frame is the maximum size of any IU in an SSP
frame.
Table 1.41 RESPONSE information unit
Bit
Byte
7 6 5 4 3 2 1 0
0
9
Reserved
10 Reserved DATAPRES
11 STATUS
12
15
Reserved
16 (MSB)
19
SENSE DATA LENGTH (n bytes)
(LSB)
20 (MSB)
23
REPONSE DATA LENGTH (m bytes)
(LSB)
24 RESPONSE DATA (DATAPRES: 01h)
23+m
24+m SENSE DATA (DATAPRES: 10b)
23+m+n
Table 1.42 defines the DATAPRES field.
Table 1.42 DATAPRES field
Code Name Description
00b NO_DATA The SENSE DATA LENGTH field is zero, and the
RESPONSE DATA LENGTH is zero.
01b RESPONSE_DATA The SENSE DATA LENGTH field is zero, and the
RESPONSE DATA LENGTH is four.
10b SENSE_DATA The SENSE DATA LENGTH field is 48, and the
RESPONSE DATA LENGTH is zero.
11b Reserved
The SSP TARG port shall return a RESPONSE frame with the DATAPRES field
set to NO_DATA if a command completes without response data or sense data to
return.