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

UVM
5

In reply to xcxfly:

Hi,

Couple of issues in your sequence item. Following is the fixed version.


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;
 
  constraint pload_cons{
//     pload.size>=46;
//     pload.size<=1500;
    // Should use size().
    pload.size() inside {[46:1500]};
  }
 
  function bit [31:0] calc_crc();
    return 32'h0;
  endfunction : cald_crc
 
  function void post_randomize();
    crc=calc_crc;
  endfunction : post_randomize
 
  `uvm_object_utils_begin(my_transaction)   //fulfill the factory login of my_transaction
    `uvm_field_int(dmac,UVM_ALL_ON)
    `uvm_field_int(smac,UVM_ALL_ON)
    `uvm_field_int(ether_type,UVM_ALL_ON)
    `uvm_field_array_int(pload,UVM_ALL_ON)
    `uvm_field_int(crc,UVM_ALL_ON)
  `uvm_object_utils_end
 
  function new(string name="my_transaction");
    super.new(name); // you missed to pass the argument
  endfunction : new
 
endclass : my_transaction

-Baser