Issue with clone method in write function of scoreboard

UVM
1

Iam having issue with $cast(expected_trans,trans.clone()); where expected_trans does not copy values from trans.clone()

function void mux_scoreboard::write_in(mux_mon_trans trans);

mux_mon_trans expected_trans ;

 $cast(expected_trans,trans.clone());

case (expected_trans.sel)
2’b01 : expected_trans.data_out = expected_trans.a;
2’b10 : expected_trans.data_out = expected_trans.b;
2’b11 : expected_trans.data_out = expected_trans.c;

endcase

expected_q.push_back(expected_trans);
endfunction

2

In reply to Veeraraju potta:

Have you implemented the do_copy() function in your sequence_item?

3

No .I have not implemented . .clone() is in build function right ?

Below is the trans item iam using

class mux_mon_trans extends uvm_object;

//object utils
`uvm_object_utils(mux_mon_trans);

//variables declaration

bit[3:0] a;
bit[3:0] b;
bit[3:0] c;
bit[1:0] sel;

bit[3:0] data_out;

//constraints
function new(string name =“mux_mon_trans”);
super.new(name);
endfunction

endclass

4

After implementing do_copy method .clone is working .

Thanks,
Veera