User Manual
SCSI Commands Reference Manual, Rev. J 458
www.seagate.com Parameters for direct access devices
Table 431 Transceiver Controls descriptor (1.5G, 3G, 6G and 12G)
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. The field is unchangeable.
CONTROLLABLE LINK RATE field
This field shall contain the controllable link rate for the phy. Table 432 lists the supported values for the field. This field is not changeable.
Table 432 Controllable Link Rates field
MAX DRIVER STRENGTH CONTROL or C1 MAX SETTING when C2 and C3 set to MIN (12G Mode Only) field
This field shall contain the max allowable driver strength output setting of the target device SAS phy. The field is changeable but not savable.
MAX DRIVER EMPHASIS CONTROL or C2 MAX SETTING when C1 and C3 set to 0 (12G Mode Only) field
This field shall contain the max allowable driver emphasis setting of the target device SAS phy. This field is changeable but not savable.
Bit
Byte
7 6 5 4 3 2 1 0
0 PHY IDENTIFIER
1 CONTROLLABLE LINK RATE
2
MAX DRIVER STRENGTH CONTROL
[12G: MAX C1 WHEN C2 AND C3 ARE SET TO MIN]
3
MAX DRIVER EMPHASIS CONTROL
[12G: MAX C1 WHEN C1 AND C3 ARE SET TO 0]
4
MAX DRIVER SLEW RATE CONTROL
[12G: MAX C1 WHEN C1 AND C2 ARE SET TO MIN]
5
DRIVER STRENGTH CONTROL CHANGE PER STEP
[12G: C1 CHANGE PER STEP]
6
DRIVER EMPHASIS CONTROL CHANGE PER STEP
[12G: C2 CHANGE PER STEP]
7
DRIVER SLEW RATE CONTROL CHANGE PER STEP
[12G: C2 CHANGE PER STEP]
8 Reserved (00h)
9 MAX RECEIVER THRESHOLD CONTROL
10 MAX RECEIVER EQUALIZATION GAIN CONTROL
11 RECEIVER THRESHOLD CONTROL CHANGE PER STEP
12 RECEIVER EQUALIZATION GAIN CONTROL CHANGE PER STEP
13-15 Reserved
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 Gpbs
0x0A Phy supports Transceiver Control controls for 6.0 Gbps
0x0B Phy supports Transceiver Control controls for 12.0 Gbps
0x0C – 0xFF Reserved