User Manual

SCSI Commands Reference Manual, Rev. J 451
www.seagate.com Parameters for direct access devices
PHY IDENTIFIER field
SAS devices may have more than one target port. If a target device has 2 operational target ports (2 phys - primary and secondary port), then
this field shall be set to either 0h for the primary port or 1h for the secondary port. This field is unchangeable.
CONTROLLABLE LINK RATE field
The Controllable Link Rate field shall contain the controllable link rate for the phy. Table 422 lists the supported values Controllable Link Rates.
This field is not changeable.
Table 422 Controllable Link Rates
DRIVER STRENGTH CONTROL or C1 PRE-CURSOR CONTROL (12Gb only) field
This field shall contain either the user input (MODE SELECT) or current (MODE SENSE) driver strength output or the 12G mode pre-cursor C1
setting of the SAS transmitter. If the user input setting is out of range of the transceiver capability, the target device shall return a CHECK CON
-
DITION status with the sense key set to ILLEGAL REQUEST and the additional sense code set to INVALID FIELD IN PARAMETER LIST for the MODE
SELECT command. This field shall be supported as described in Table 423. The field is changeable but not savable.
Table 423 DRIVER STRENGTH CONTROL or C1 PRE-CURSOR CONTROL (12G Mode Only) values
Value Definition
0x00 Phy exists, but does not support “Transceiver Control” controls
0x01 – 0x07 Reserved
0x08 Phy supports Transceiver Control controls for 1.5 Gbps
0x09 Phy supports Transceiver Control controls for 3.0 Gbps
0x0A Phy supports Transceiver Control controls for 6.0 Gbps
0x0B Phy supports Transceiver Control controls for 12.0 Gbps
0x0C – 0xFF Reserved
Value Definition
0x66 (write only)
(1.5G - 6G)
Write 66h shall reset the driver strength setting back to factory default value.
0x00 – Range Limit
(write only)
User input for driver strength control setting or C1 pre-cursor setting.
If the new user input is out of range specified in subpage 19h/E5h,
the target device shall maintain the current setting.
Read Only The current setting value shall be displayed.