RE: [sv-bc] When are constant expressions evaluated?

>Is there any significance to the legality of a default value of the
parameter,
>or only to the actual instantiated values? 

The default value of a parameter is itself a constant expression, so
cannot in general be evaluated until elaboration time, because it may
depend on the actual instantiated values of other parameters.

For example, in the following, even the types of P and Q are not known
until elaboration time

       parameter M = 6;
       parameter N = 10;
       parameter [M-1:0] P = N + 2;
       parameter Q = N + M;
         
-- Brad

[ In reply to http://www.eda-stds.org/sv-bc/hm/5485.html .]


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