Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
68
17.5
Link Layer
The SAS Link layer defines primitives, address frames, and connections. The Link layer is the interface between the
Port layer and the PHY layer. This section describes Link layer behaviors of the drive. For a complete description of
SAS Link layer, please see the ANSI specification, SPL-3.
17.5.1
Address Frames
Address frames are used for the identification sequence and for connection requests and are only sent outside
connections. The Address Frame format is defined below:
Table 33 Address Frame Format
Byte
Bit
7
6
5
4
3
2
1
0
0
RSVD Device Type Address Frame Type
1-27
Frame Type Dependent bytes
28-31
CRC
 Address Frame Type indicates the type of address frame and is defined in Table 33. This field determines the
definition of the frame type dependent bytes.
Table 34 Frame Type:
Value
Address Frame Type Description
0000b
IDENTIFY: Identification Sequence
0001b
OPEN: Connection Request
Others
Reserved