Constraint for multidimensional array

SystemVerilog
,
1

How to write constraint for this md array
md_array=‘{‘{‘h0,’h0,’h0,’h0},’{‘h1111,’h0,’h0,’h0},’{‘h1111,’h1111,’h0,’h0},’{‘h1111,’h1111,’h1111,’h0}}

2

In reply to shravanikuchana:

class my_class;
  rand bit [15:0] arr[4][4];

  constraint c_arr {
    foreach (arr[i]) {
      foreach (arr[j]) {
        if (i<j) 
        arr[j][i] == 'h1111;
        if (i>=j)
        arr[j][i] == 'h0000;
      }
    }
  }

endclass : my_class

module top();
  my_class mc = new();

  initial begin
    mc.randomize();
    $display("mc.arr = %p",mc.arr);
  end

endmodule : top

Regards,
Mega

3

In reply to megamind:

I guess the more simpler code would be this



module test();
  
  class cls;
    rand bit [15:0]md_array[4][4];
  
    constraint c1{ 
      foreach(md_array[i,j]) {
        if(i>j)
          md_array[i][j]==16'h1111;
        else 
          md_array[i][j]==16'h000;
        
      }
     
      
    }
  
  endclass

cls obj;
  initial begin
    obj =new();
    obj.randomize();
    $display("obj.arr = %p",obj.md_array);
    
    
  end
    
endmodule
4

In reply to megamind:

Thank You Mega. Its working perfectly…

5

In reply to sa5691:

Thank you for making it really simple and understandable…