constraint dist 'others'

[ljepson74]

*,

How can I randomize with a dist and specify a weight for values not being inside a range?

 class randclass;
    rand logic [3:0] randvalue;

    function void post_randomize();
      $display("value: %0d",randvalue);
    endfunction

   constraint inside_practice {
     randvalue dist {
       [3:4] :/ 50,
       !(inside {[3:4]}) :/ 50    //<---  I try to have a sort of 'others' category here
     };
   }   
 endclass

module top;
  randclass randclass;

  initial begin
    randclass = new();
    repeat (10) begin 
      randclass.randomize();
    end
    $finish();
  end
endmodule

 

Reference:  https://www.edaplayground.com/x/cV5 

 

shaking off the rust after a SystemVerilog hiatus,

thanks

 

[dave_59]

https://verificationacademy.com/forums/systemverilog/distributed-weightage-constraint#reply-46525

[lbodrozic]

@dave_59

The link you posted as an answer here points to a question about distributed weighting. I think maybe the link is for the wrong post? Anyway, I am quite interested if there is a way to do what the OP is asking about.

[dave_59]

The link answers the question on how to apply a distribution to any set of constraints. The dist construct only works with explicit values.