:CHANnel:SCRecovery:PLLoop:OJTF:DFACtor
Command Syntax
:CHANnel{1:8}{A|B|C|D}:SCRecovery:PLLoop:OJTF:DFACtor <factor>
<factor> is a double.
Where the required specifier {1:8}{A|B|C|D} identifies a channel by its module slot number and channel letter. For example, channel 3C (CHANnel3C).
The channel specifier will fail if it does not include a slot number. If instead the suffix's channel letter is missing, the command defaults to letter A. As a result, the best practice is to always explicitly specify the channel by including both the module slot number and channel letter.
Query Syntax
:CHANnel{1:8}{A|B|C|D}:SCRecovery:PLLoop:OJTF:DFACtor?
Description
For the selected channel's software clock recovery, defines the Damping Factor of a second-order PLL's Observed Jitter Transfer Function (OJTF). The following table shows the damping factor settings for some standards.
OJTF for 2nd Order PLLs
| Standard | Damping Factor |
|---|---|
| SAS 1.5 Gb/s | 50.0 |
| SAS-SSC 1.5 Gb/s | 0.860 |
| SATA 1.5 Gb/s | 0.767 |
| SAS 3.0 Gb/s | 50.0 |
| SAS-SSC 3.0 Gb/s | 0.860 |
| SATA 3.0 Gb/s | 0.860 |
| SAS 6.0 Gb/s | 50.0 |
| SAS-SSC 6.0 Gb/s | 0.860 |
| SATA 6.0 Gb/s | 0.767 |
| QPI | 0.800 |
| USB 3.0 | 0.707 |
Before this command can take effect, you must disable shared acquisition parameters with the :CHANnel:RTSCope:TRACkcommand.
Requires FlexDCA revision A.06.70 and above.
Example Command
:CHANnel2A:SCRecovery:PLLoop:OJTF:DFACtor 0.860