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Spectre PXF: using Jitter parameters in analysis options

mmVivek

Hi Everyone

I just noticed that the Spectre PXF analysis offers the following set of parameters, but I cannot quite figure out how or what these options can be used for.
I have a feeling that they might be pretty handy, but I could not find useful explanations or examples either in the online manual or on Sourcelink.

The parameters in question are (displayed using spectre -h pxf:)

Jitter parameters
22 externalsources Pairs of terminals or nodes corresponding to external jitter sources.
23 extcorrsources1 Pairs of terminals and nodes for the first group of correlated external jitter sources.
24 extcorrsources2 Pairs of terminals and nodes for the second group of correlated external jitter sources.
25 deterministicsources
Pairs of terminals or nodes corresponding to deterministic jitter sources.
26 determsourcesfreqs
Frequency list corresponding to the external deterministic jitter sources.

Could someone tell me how these are meant to be used? 

Thanks,
Vivek



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