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SCSI Commands Reference Manual, Rev. J 445
www.seagate.com Parameters for direct access devices
5.3.29 Enhanced Phy Control mode page (19h/03h)
The Enhanced Phy Control mode page contains parameters that affect SAS target phy operation. If the mode page is
implemented by one logical unit in a SCSI target device, then it shall be implemented by all logical units in the SCSI target device
that support the MODE SELECT or MODE SENSE commands.
The mode page policy (see 5.4.14) for this mode page shall be shared.
Table 417 defines the format of this mode page.
The Parameters Saveable (PS) bit is defined in 5.3.5.
The SubPage Format (SPF) bit is defined in 5.3.5 and shall be set to the value defined in table 417.
The PAGE CODE field is defined in 5.3.5 and shall be set to the value defined in table 417.
The SUBPAGE CODE field is defined in 5.3.5 and shall be set to the value defined in table 417.
The PAGE LENGTH field is defined in 5.3.5 and shall be set to the value defined in table 417 (i.e., 4 + (the value of the NUMBER OF PHYS field) ยด (the
length in bytes of the SAS phy mode descriptor)).
PROTOCOL IDENTIFIER field
The PROTOCOL IDENTIFIER field is defined in 5.3.23 and shall be set to the value defined in table 417 indicating that this is a SAS specific mode
page.
GENERATION CODE field
The GENERATION CODE field is defined in the Phy Control and Discover mode page (see 5.3.27).
NUMBER OF PHYS field
The NUMBER OF PHYS field contains the number of phys in the SAS target device and indicates the number of enhanced phy control mode
descriptors in the enhanced phy control mode descriptor list. This field shall not be changeable with the MODE SELECT command.
ENHANCED PHY CONTROL MODE DESCRIPTOR
The enhanced phy control mode descriptor list contains an enhanced phy control mode descriptor for each phy in the SAS target device, not
just the SAS target port, starting with the lowest numbered phy and ending with the highest numbered phy.
Table 417 Enhanced Phy Control mode page
Bit
Byte
7 6 5 4 3 2 1 0
0 PS SPF(1b) PAGE CODE (19h)
1 SUBPAGE CODE (03h)
2 (MSB)
PAGE LENGTH (n - 3)
3 (LSB)
4 Reserved
5 Reserved PROTOCOL IDENTIFIER (6h)
6 GENERATION CODE
7 NUMBER OF PHYS
Enhanced phy control mode descriptor list
8
Enhanced phy control mode descriptor (first) (see table 418). . .
27
. . . . . .
n - 19
Enhanced phy control mode descriptor (last) (see table 418). . .
n