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Error evaluating ocean expresstion

winever

Hi everybody,

I got the following error when doing Monte Carlo analysis.

Error evaluating ocean expresstion bw = bandwidth(VF("/VOUTP") 3 "low")

It seems that the error is always there whether the analysis is done using ADE or OCEAN. For all the iterations, some can got the expected results while the others return the above error. However, I get the above expression from the Cadence Tool Calculator. I tried it several times, but the error was still there. Now, I was confused. Could anyone tell me what goes wrong? I appreciate it for your help.

 

Regards,

Winever.   

Parents
  • Pedro Zamuner

    Hey there Winever and Matt,

     

    I have some experience with SKILL/Ocean scripts and my cases are similar as Matt stated. When running Monte Carlo or some Corners the circuit reaches some point that it does not have a valid value and it returns nil. If you pass nil to some other function it might throw an error.

     

    You may try to use the errset() function (read more at Skill Language User Guide, chapter 9 Advanced Topics at Error Handling section).

    As function results are stored into a list. I'll take the first element using car(). This way, you can do something like this:

     

    bw = car( errset( bandwidth(VF("/VOUTP") 3 "low") ) )

     if( bw then printf( " ok " ) else printf( "unable to evaluate expression" ) )

     Hope it helps.

    - Pedro.

     

Reply
  • Pedro Zamuner

    Hey there Winever and Matt,

     

    I have some experience with SKILL/Ocean scripts and my cases are similar as Matt stated. When running Monte Carlo or some Corners the circuit reaches some point that it does not have a valid value and it returns nil. If you pass nil to some other function it might throw an error.

     

    You may try to use the errset() function (read more at Skill Language User Guide, chapter 9 Advanced Topics at Error Handling section).

    As function results are stored into a list. I'll take the first element using car(). This way, you can do something like this:

     

    bw = car( errset( bandwidth(VF("/VOUTP") 3 "low") ) )

     if( bw then printf( " ok " ) else printf( "unable to evaluate expression" ) )

     Hope it helps.

    - Pedro.

     

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