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SAS Interface
78 C141-C013
1.6 Transport layer
1.6.1 SSP frame format
This layer defines the processing of each of a COMMAND frame, TASK frame,
DATA frame, XFER_RDY frame and RESPONSE frame.
Table 1.32 contains the definitions of the SSP frame format. An SSP frame
consists of the header part, information unit part, and CRC.
Table 1.32 SSP frame format
Bit
Byte
7 6 5 4 3 2 1 0
0 FRAME TYPE
1 (MSB)
3
HASHED DESTINATION SAS ADDRESS
(LSB)
4 Reserved
5 (MSB)
7
HASHED SOURCE SAS ADDRESS
(LSB)
8 Reserved
9 Reserved
10 Reserved
RETRY
DATA
FRAMES
RETRA-
NSMIT
CHANGING
DATA
POINTER
11 Reserved
NUMBER OF FILL
BYTES
12 Reserved
13
15
Reserved
16 (MSB)
17
TAG
(LSB)
18 (MSB)
19
TARGET PORT TRANSFER TAG
(LSB)
20 (MSB)
23
DATA OFFSET
(LSB)
24 (MSB)
m
INFORMATION UNIT
(LSB)
Fill bytes (0 to 3bytes)
n-3 (MSB)
n
CRC
(LSB)