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Find the Last Wave Transition Delay Time

DramDaddy

Hi,

I'm trying to determine the time between the last edge transition after I set a control signal which based off a timing variable I've placed into the test bench.

I have attempted to use the cross function to achieve this with no good results.

cross(VT("/out") (0.5*VAR("vdd")) 1 "falling" t "VAR("Off")" nil)

Is there another function that can achieve this goal?

Thanks.

  • ShawnLogan

    Dear DramDaddy,

    DramDaddy said:

    I'm trying to determine the time between the last edge transition after I set a control signal which based off a timing variable I've placed into the test bench.

    I have attempted to use the cross function to achieve this with no good results.

    cross(VT("/out") (0.5*VAR("vdd")) 1 "falling" t "VAR("Off")" nil)

    I apologize, but your objective is not clear to me! 

    In Figure 1, I've tried to put together my guess as to your objective with a note about the syntax of your cross() function and a set of outputs to compute what I think you are trying to measure. Of course, you could create a single expression from the illustrated expressions, but I find the use of a number of distinct expressions makes the overall expression more readable and manageable for others viewing your test bench.

    I hope this is something close to what you are intending to measure and it helps provide some thoughts DramDaddy.

    Shawn

    Figure 1

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