Control over randomization without using constraint

Question

I have a variable which is int and i need to randomize it and print only 0 & 3 using $randomrange() how it can be done??

Answer 1

Shashank Gurijala

Full Access

91 posts

July 22, 2022 at 3:45 am

In reply to araj380:

module print_0or3_only;
  int var_1;
 
  initial begin
    repeat(30) begin
      var_1 = 3 * $urandom_range(0,1);
      $display("\nvar_1 = %0d",var_1);
    end
  end
endmodule

Answer 2

araj380

Full Access

3 posts

July 22, 2022 at 4:14 am

In reply to Shashank Gurijala:

Quote:

In reply to araj380:

module print_0or3_only;
  int var_1;
 
  initial begin
    repeat(30) begin
      var_1 = 3 * $urandom_range(0,1);
      $display("\nvar_1 = %0d",var_1);
    end
  end
endmodule

what if the values increase...let say now i want to print 0,3,5,6,8,9 then how i can write it in efficient way

Answer 3

Solution

Shashank Gurijala

Full Access

91 posts

July 22, 2022 at 4:58 am

In reply to araj380:

module print_req_values;
  int var_1;
  int array[] = {0,3,19,37,52,85,99}; //if more values are needed, the respective elements can be added 
 
  initial begin
    $display("\nThe values that are needed : %0p",array);
    repeat(250) begin
      var_1 = $urandom_range(array.min()[0],array.max()[0]);
      while (!(var_1 inside {array}))  var_1 = $urandom_range(array.min()[0],array.max()[0]);
      $display("\nvar_1 = %0d",var_1);
    end
  end	
endmodule

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