HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
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18.10.12.3 PHY Control and Discover (Subpage 1)
Table 119: PHY Control and Discover (Subpage 1)
The Phy Control And Discover subpage contains phy-specific parameters. MODE SENSE command returns the current set-
tings for the initiator.
• Protocol Identifier has a value of 6h indicating this is a SAS SSP specific mode page.
• The GENERATION CODE field 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-2 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 field is set to 2, to represent the dual ported drive (one PHY per port)
Byte
Bit
Default
76543210
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 ...
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