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Async signal assetions

SVA1

Hi,

There is one async signal a_sync, this signal needs to be stable till first incoming clk.  a_sync signal may get change any time irrespective to clk.

I have written property as follows, it works fine for single bit, but for multibit a_sync signal I need help.

property abc(a_sync, clk);

 int temp_val; 

  @(a_sync) (1,temp_val = ~a_sync /*inverse because previous value will be sampled*/ ) ##1

   @(posedge clk) (temp_val === a_sync);
endproperty

 

This wont work for multibit signal. How can we do for multibit. There are many such signal, so I want to write generic assetion property.

-Kunal 

  • Hi Kunal,

    pretty much code for a simple behavior. Did you consider PSL for this property? PSL has 2 advantages: unclocked properties and initial properties. Example:

    abc: assert stable(a_sync) until(clk);

    It would be evaluated each time an event on a_sync or clk occurs. I assume this is the behavior you describe?

     Joerg.

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