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Weird behavior when using drGetWaveformYVec and drGetElem with a logic signal

radustoica

Hello,

  I need to automatically process the results of some mixed-signal simulations, containing both analog and digital signals.

  I am using the drGetWaveformYVec function to get the Y values for these signals, then drGetElem to get the element values from the resulting vectors. This works ok for analog signals, but for the digital signals I see a weird behavior - the value returned by drGetElem makes no sense.

For example:

digital_voltage = v("some.logic.signal")

srrWave:0x3fa1b0d0

ymax(digital_voltage)

5.0

 yvec_digital_voltage = drGetWaveformYVec(digital_voltage)

srrVec:0x3fa5f3c0

drGetElem(yvec_digital_voltage 0)

192



Why would this happen? Is this the expected behavior? If yes, is there any possibility to check if a waveform comes from a digital signal, so that I can skip their processing?

  • Yes, there's some special encoding of logic signals - the various states (0, 1, Z, X plus strength info) show up with some special numbers.

    Anyway, if you do drType(yvec_digital_voltage) or drGetWaveformYType(digital_voltage) they will return the symbol logic (so drType(yvec_digital_voltage)=='logic)

    Andrew

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