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Vih and Vil using calculator - value and cross functions?

Hello,

I am trying to find out the Vih and Vil levels for my design. I think Value and Cross function can help me but I am not sure how, as in cross I have give the threshold value. So lets say I have a triangular input waveform and square output waveform (in phase) and I am trying to find the points at which the rising and falling edges cross.

Is there a way to do this to write a formula in the calculator and bring the expression into ADE so I can run corners on it later?

I am using IC514

Thanks

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