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WaveScan postprocessing question

pyohayo

Hello,

I want to realize the folowing post-processing scenario:

  1. Clip a particular signal, according to the following condition: 
    clip(v("/grp1_clk" ?result "tran-tran") 0 cross(v("/grp1_adc" ?result "tran-tran") 0.9 1 "falling" nil nil))
  2. Then in this clipped signal I want to calculate the number of transitions. The command below get table of transitions
    cross(wave_33() 0.9 1 "rising" t "time"), where wave_33 - the waveform from p.1
  3. How to get the length of this table that is the number of transitions. The only way I found is to export table in Excel (.csv) and calculate it in Excel.

Probably dos exist some more "smart" method ?

Other question: how to use the name of clipped-signal expression from p. 1 (i.e. clipped_clk in my case) in the exprssion of p. 2 (wave_33 comes from WaveScan).

Thanks

Parents

  • The wavescan calculator doesn't allow you to name expressions and then use them later on. The wave_33() comes from how you can select a waveform in the graph and use it in the calculator, but it is created on the fly. In ViVA you can send a waveform to the calculator with the expression used to create it, or you can give the expression a name and then use that - but in the ancient tool you're using, you can't.

    You could of course nest the expression:

    length(cross(clip(v("/grp1_clk" ?result "tran-tran") 0 cross(v("/grp1_adc" ?result "tran-tran") 0.9 1 "falling" nil nil)) 0.9 0 "rising"))

    The cross function, if given 0 as the crossing number (and omitting the t and "time" arguments) will return a list of the crossing points, and you can then use the SKILL length function to find how many there were.

    Andrew.

Reply

  • The wavescan calculator doesn't allow you to name expressions and then use them later on. The wave_33() comes from how you can select a waveform in the graph and use it in the calculator, but it is created on the fly. In ViVA you can send a waveform to the calculator with the expression used to create it, or you can give the expression a name and then use that - but in the ancient tool you're using, you can't.

    You could of course nest the expression:

    length(cross(clip(v("/grp1_clk" ?result "tran-tran") 0 cross(v("/grp1_adc" ?result "tran-tran") 0.9 1 "falling" nil nil)) 0.9 0 "rising"))

    The cross function, if given 0 as the crossing number (and omitting the t and "time" arguments) will return a list of the crossing points, and you can then use the SKILL length function to find how many there were.

    Andrew.

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