Constraint to repeat a number at every third time

SystemVerilog
,
4

In reply to syed taahir ahmed:

BTW, here’s a way to do it without the code calling randomize() having to know about the constraint:

class A ;
   rand bit [3:0] varr ;
   int count; // make this static if you repeat constructing the class every time
   constraint C {  
                if ( ( count % 3 ) == 0 ) // Constraint Guard
                   { varr == 5 ; }
                else 
                   { varr != 5 ; }
   }	
   function void post_randomize();
      count++;
   endfunction	
endclass
 
module Main;
 
   A a1 ;
 
   initial begin
      a1 = new();
      repeat(10)
	if ( a1.randomize() )
	  $display("Success with a1 == %p",a1);
	else $error("randomize failed");
   end
endmodule : Main