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How get the "eventtime" variable calculated and used in the sampled PAC analysis

groviere

Hello.

I would like to use the "eventtime" variable in the calculator to perform a certain computation.

The "eventtime" variable I am talking about is the PAC sampling time, calculated when a certain condition is met. (In my case the condition is when a given net reaches vdd/2. This can be set-up in the PAC analysis form).

I can explicit access the computed value of "eventtime" in the Direct Plot-> PAC -> Variable Value (eventtime). In my case it's something like  4.50996n

However, as this value may change for different testing conditions, I would like to get it via variable evaluation. Something like: VAR("eventtime"), so I can use it in my calculator.

This what I currently have in the calculator:

value((v("/vop" ?result "pac-pac_cross") - v("/von" ?result "pac-pac_cross")) '"eventtime" '4.50996e-09)

This is what I would like to use instead.

value((v("/vop" ?result "pac-pac_cross") - v("/von" ?result "pac-pac_cross")) '"eventtime" VAR("eventtime"))

The latter expression is of course not working because VAR("eventtime") is not a correct expression.

The setup I am working with is: Virtuoso 6.1.7-64b and Spectre 18.1.0.169.isr2 64bit

Thank you for any help.

GR

  • Andrew Beckett

    You can use:

    sweepValues(v("/vop" ?result 'pac_sampled)) 

    to get a list of the eventtime values. So if it's the first event, you'd use:

    car(sweepValues(v("/vop" ?result 'pac_sampled)))

    Note that I used the aliased result name here 'pac_sampled, but it would also work with "pac-pac_cross" too.

    Regards,

    Andrew.

  • groviere
    in reply to Andrew Beckett

    Thank you very much Andrew.

    This solves my problem!

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