:FUNCtion:CRECovery:PLL:TDEPendent
Command Syntax
:FUNCtionN:CRECovery:PLL:TDEPendent {ON | OFF | 1 | 0}
Where N identifies one of sixty four {1:64} math functions that you can create. For example, :FUNCtion2.
Query Syntax
:FUNCtionN:CRECovery:PLL:TDEPendent?
Description
Specifies whether the PLL is dependent on (ON) or independent of (OFF) transition density.
The PLL algorithm can calculate the recovered clock in two different ways:
OFF— The JTF and OJTF responses are static and independent of transition density.ON— The JTF and OJTF change dynamically with varying transition density and are therefore dependent on transition density.
Transition density specifies how often there are transitions in the signal. For example, clock signals and 10101010... data patterns have a transition density of 100%; 11001100... data patterns, pseudo-random binary sequences (PRBS), and 8B/10B have a transition density of 50%.
Transition density can affect a PLL's phase error and loop bandwidth. See "How Transition Density Can Affect Jitter Measurements" in the user's guide.
Selecting the Transition Density Dependent PLL mode changes how the 3 dB bandwidth, peaking, and damping factor parameters are interpreted.
OFF— The JTF and OJTF responses always directly reflect the specified parameters, independent of the input data pattern.ON— The JTF and OJTF responses reflect the specified parameters only when the input data pattern has a transition density of 50%.
If you want to specify these parameters at a different transition density, see "Adjusting PLL Specifications for Transition Densities Other Than 50%" in the user's guide.
Example Command Sequence
:FUNCtion1:CRECovery:MODE SOPLl :FUNCtion1:CRECovery:PLL:TDEPendent OFF