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expression to get a scalar after a sweep

davidzti

Hello,

I found some info on this subject posted a few years ago, but wasn't able to find a definitive solution.  I've been trying to get a scalar output from a sweep and use it in other tests via calcVal function, similar in spirit to these couple posts:

https://community.cadence.com/cadence_technology_forums/f/38/t/30795

https://community.cadence.com/cadence_technology_forums/f/38/t/17712

However, I can't figure out how to do it!  I wanted to ask if this functionality is available (to evaluate expression on a data set, vs on a per-point basis)?  If so, would someone kindly advise on how I can accomplish this?  (I'm on 6.1.6).

Many thanks in advance,

David

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  • Andrew Beckett

    Hi David,

    In that case, it sounds as if you need to use the "measurement over corners" capability in ADE XL. For your output min_spread_code, go to the column labelled "EvalType" (which shows "point" - it's probably next to the expression) and click on it until it shows a cyclic field - you can then set it to "corners". For some of the calculator functions, e.g. ymin, ymax, average, stddev and so on, this causes an additional ?overall t argument to be added to the function in the expression. That doesn't happen for xmin or xmax for some reason. 

    In this case it may not be necessary though because xmin would actually be just looking across a simple sweep - so it probably just works. I have some custom code that I wrote when investigating a customer case for a colleague a while back when I realised that xmin didn't support ?overall, but having written it and tested it I decided that in the case I was looking at it wasn't strictly needed. Let's see if this works first, and if not we can try my custom code. 

    Having evaltype of corners causes the expression to be evaluated once at the end of all the corners, rather than per-point. In IC617 in Assembler you have further choices for this field to allow measurements across parameters or measurements across everything, but don't think you need that here.

    Anyway, see if this works to produce a single output from the corners, and then see if that can be passed across as a calcVal to the next test. I'm afraid I didn't have time to try this out this morning, but hopefully it should all just work (fingers crossed).

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Hi David,

    In that case, it sounds as if you need to use the "measurement over corners" capability in ADE XL. For your output min_spread_code, go to the column labelled "EvalType" (which shows "point" - it's probably next to the expression) and click on it until it shows a cyclic field - you can then set it to "corners". For some of the calculator functions, e.g. ymin, ymax, average, stddev and so on, this causes an additional ?overall t argument to be added to the function in the expression. That doesn't happen for xmin or xmax for some reason. 

    In this case it may not be necessary though because xmin would actually be just looking across a simple sweep - so it probably just works. I have some custom code that I wrote when investigating a customer case for a colleague a while back when I realised that xmin didn't support ?overall, but having written it and tested it I decided that in the case I was looking at it wasn't strictly needed. Let's see if this works first, and if not we can try my custom code. 

    Having evaltype of corners causes the expression to be evaluated once at the end of all the corners, rather than per-point. In IC617 in Assembler you have further choices for this field to allow measurements across parameters or measurements across everything, but don't think you need that here.

    Anyway, see if this works to produce a single output from the corners, and then see if that can be passed across as a calcVal to the next test. I'm afraid I didn't have time to try this out this morning, but hopefully it should all just work (fingers crossed).

    Regards,

    Andrew.

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