Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
183
18.10.12.3
PHY Control and Discover (Subpage 1)
Table 150 PHY Control and Discover (Subpage 1)
Byte
Bit
Default
7
6
5
4
3
2
1
0
0
PS
SPF=1
Page Code = 19h
D9h
1
Subpage Code = 1
01h
2-3
(MSB)
Page Length = 0064h
(LSB)
0064h
4
Reserved
00h
5
Reserved Protocol Identifier = 6h
06h
6
Generation Code
00h
7
Number of PHYS = 2
02h
8-55
SAS PHY Mode Descriptor 0
...
56-103
SAS PHY Mode Descriptor 1
...
The PHY Control and Discover subpage contains PHY-specific parameters. MODE SENSE command returns the
current settings for the initiator.
 Protocol Identifier has a value of 6h indicating this is a SAS SSP specific mode page.
 Generation Code is a one-byte counter that shall be incremented by one by the device server every time the
values in this mode page or the SAS-3 PHY mode page (see 10.2.7.7) field values are changed. A
GENERATION CODE field set to 00h indicates the generation code is unknown. The device server shall wrap
this field to 01h as the next increment after reaching its maximum value (i.e., FFh). The GENERATION CODE
field is also contained in the Protocol-Specific Port log page and may be used to correlate PHY settings across
mode page and log page accesses.
 Number of PHYS is set to 2, to represent the dual ported drive (one PHY per port)
 SAS PHY Mode Descriptor are defined in Table 148. There are two SAS PHY Mode Descriptor fields, one
per port.