How to confirm the reason of a bug of '$rand.pload'

UVM
10

In reply to xcxfly:

Please see below:

class my_transaction extends uvm_sequence_item;
 
  rand bit[47:0] dmac;
  rand bit[47:0] smac;
  rand bit[15:0] ether_type;
  rand byte      pload[];
  rand bit[31:0] crc;
  rand int       len;

  constraint pload_cons{pload.size() == len;}
  function new(string name="my_transaction");
    super.new(name);
    pload = new[len];
  endfunction : new

  .....
endclass

In your sequence pass the constraint for your transaction to the `uvm_do.

   virtual task body();
      if(starting_phase != null) 
         starting_phase.raise_objection(this);
      repeat (10) begin
         `uvm_do_with(m_trans, {len == inside {[46:1500]};})
      end
      #100;
      if(starting_phase != null) 
         starting_phase.drop_objection(this);
   endtask