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Force X in gate level simulation

POUCO over 6 years ago

How to initialize flops not having reset pin in gate level simulation?

I expected -ncinitialize to do. but it doesn't.

What is the best (simple) and general way for cadence simulator ?

Thanks in advance.

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StephenH over 6 years ago

Hi. You'll need to give us some more detail. Did you pass -ncinitialize to the elaboration command or the simulation one? Did it report any errors, and if so, what errors?

Also your subject line conflicts with the content - are you trying to set flops to X (per the subject line) or initialise them to a 0/1 value?

Login to support.cadence.com and search on ncinitialize, and you'll find a wealth of documentation and app notes for this; did you try that?
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POUCO over 6 years ago in reply to StephenH

Hi,

I want to force X to 0 or 1. -ncinitialize works for reg in UDP also ? I used irun command to do elaboration and simulation all at once. There was not error and warning about it.
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StephenH over 6 years ago in reply to POUCO

UDPs can be tricky as they can override the initial values. Take a look at this app note for some ways to deal with it: https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000000nTEPEA2&pageName=ArticleContent, or this one: https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000000tFllEAE&pageName=ArticleContent which explains how to find unreset flops and deal with them programatically.

You shouldn't need to explicitly initialise to X, that should generally be the default, right?
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POUCO over 6 years ago in reply to StephenH

I'm sorry I don't know Host ID to read your link now. I'll check at my company later.

THANKS!
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POUCO over 6 years ago in reply to StephenH

I'm sorry I don't know Host ID to read your link now. I'll check at my company later.

THANKS!
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