User Manual

SCSI Commands Reference Manual, Rev. J 449
www.seagate.com Parameters for direct access devices
The PARAMETERS SAVEABLE (PS) bit is defined in SPC-5.
The SUBPAGE FORMAT (SPF) bit is defined in SPC-5 and shall be set to the value defined in table 419.
The PAGE CODE field is defined in SPC-5 and shall be set to the value defined in table 419.
The SUBPAGE CODE field is defined in SPC-5 and shall be set to the value defined in table 419.
PAGE LENGTH field
The PAGE LENGTH field is defined in SPC-5 and shall be set to the value defined in table 419 (i.e., 4 + (the value of the NUMBER OF PHYS field) ×
(the length in bytes of the SAS phy mode descriptor)).
PROTOCOL IDENTIFIER field
The PROTOCOL IDENTIFIER field is defined in SPC-5 and shall be set to the value defined in table 419 indicating that this is a SAS specific mode
page.
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. If a target device has 2 operational target ports (2 phys), then this field shall be set
to 2h. Target devices with only one port shall set this field to 1h. This field shall not be changeable with the MODE SELECT command.
TRANSCEIVER CONTROLS MODE DESCRIPTORS LENGTH fields
This Transceiver Controls Mode Descriptors Length fields shall contain the total length in bytes of each phy's transceiver controls mode
descriptor. Since the descriptors are the same length, this value is not provided in each descriptor, but rather, once in this subpage prior to the
descriptor(s). The field is unchangeable.
CONTROLLABLE LINK RATE = 0Ah
. . . . . .
128 Phy Transceiver Controls mode descriptor (second) PHY IDENTIFIER = 1
CONTROLLABLE LINK RATE = 0Bh
. . . . . .
144 00
Table 419 SAS Transceiver Control (Out) subpage
Bit
Byte
7 6 5 4 3 2 1 0