Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
74
17.6
Transport Layer
The Transport layer defines frame formats. The Transport layer is the interface between the Application layer and
Port layer. It is responsible for constructing and parsing frame contents. For SSP, the Transport layer only receives
frames from the Port layer that are going to be ACKed by the Link layer. This section describes Transport layer
behaviors of the drive. For a complete description of SAS Transport layer, please see the ANSI specification, SPL-3.
The Transport layer defines the frame format as follows.
Table 40 SAS Frame Format
Byte
Bit
7 6 5 4 3 2 1 0
0
Frame Type
1-3
Hashed Destination Address
4
Reserved
5-7
Hashed Source Address
8-9
Reserved
10
Reserved TLR Control = 00b
Retry Data
Frames =0b
Retransmit RSVD
11
Reserved # of fill bytes
12-15
Reserved
16-17
Tag
18-19
Target Port Transfer Tag
20-23
Data Offset
24-m
Information Unit
Fill Bytes (if needed)
(n-3)-n
CRC