Changing ADEXL output Spec depending on a Sweep variable

See How to use a variable in a Spec in ADE Assembler and ADE XL - essentially you put VAR("someVar") as the spec limit.

Andrew.

Yes Andrew. I am using VAR("") in spec for fixed specs but how can I do sth like below?

Let's say I have VDD as sweeping variable and checking is PSRR spec for different supply.

VDD:      Spec:

1V           >30dB

0.9V       >27dB

0.8V       >25dB

thanks

yayla

Adding below trouble shooting if anyone else is having a similar issue:

"How to define output specification based on the design variable value"

https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O0V000009MpdwUAC&pageName=ArticleContent

Thanks for posting that reference to an article. I was going to put together a similar approach but didn't have time to experiment and test it - great to know that a colleague had already done so and published an article describing how to do so.

Hi, I am sorry but i do not why I am not able to ask a question by creating a new blog post. It is urgent so I am asking this question here. I extracted a value from the graph using value() function in the calculator. Now, is it possible to use this extracted value for a design variable value? If so, how?

First of all, the forums are not intended for urgent topics, since this is the community helping you out (yes, some of us work for Cadence, but we respond in our spare time) and not as an alternative to property customer support. So urgent things should always go to customer support.

If you can't post in a new thread, maybe your profile hasn't been completed - see this thread.

You can use the results of measurements from one test as a variable in another test by using calcVal("outputName" "testName") - you can do that by dragging the output row into the variable definition. It does need to be in a different test, as the variable will influence a subsequent simulation, and not the same simulation. It's not entirely clear whether that's what you were asking.

Andrew.

Hi again, I actual wanted to use value(Gradient 60) as the value for my m variable and (value(v("/net5" ?result "dc") 60) - 0.06) as the value for my c variable. So, that each time a simulation is run I do not have to change them manually. Is it possible to do so? If so, how?

Arefinn said:

Is it possible to do so? If so, how?

OK, you didn't mention you were using ADE L either, which was quite an important piece of information. Anyway, I was going to say "no", but there is a way to have a variable update after the simulation based on results (of course, this may mean that each time you press the run button you now get different results, because the results are based on the previous run - which is not always desirable). If that's what you want, you could load the following code in your .cdsinit:

procedure(CCFupdateDesignVar(var value @optional (session asiGetCurrentSession()))
  let((vars ptr strVal)
    if(numberp(value) then
      vars=asiGetDesignVarList(session)
      strVal=aelSuffixNotation(value)
      ptr=assoc(var vars)
      if(ptr then
        rplaca(cdr(ptr) strVal)
      else
        vars=cons(list(var strVal) vars)
      )
      asiSetDesignVarList(session vars)
    else
      warn("CCFupdateDesignVar cannot update %s because %L not a number" var value)
    )
    value
  )
)

Then in the outputs change the two last expressions to:

CCFupdateDesignVar("m" value(Gradient 60))
CCFupdateDesignVar("c" (value(v("/net5" ?result "dc") 60) - 0.06))

The results in the output pane will be whatever the second argument evaluates to, but they will also update the design variable as the results evaluation is done.

Does that help? BTW, I make no assurances as to how robust this approach is as I only did very limited testing (I checked to make sure it doesn't fail with a parametric sweep, for example, but other than that, I didn't test much. I also didn't check that it would work with ADE Explorer/Assembler - I'm not sure it would).

Andrew.