uvm_do_callbacks problem

[mrforever]

Hi, experts,

I met one problem when i use the `uvm_do_callbacks macro.

The way of using `uvm_do_callbacks macro:

 

 

•class  A extends uvm_callback;

•    virtual task pre_tran(mac_driver  mac_drv, ref mac_transaction tr);

•    endtask

•endclass //A

•

•typedef uvm_callbacks#(mac_driver, A) A_pool;

•

•class mac_driver extends uvm_driver#(mac_transaction);

•    ···

•    `uvm_register_cb(mac_driver, A);

•endclass //mac_driver

•

•task mac_driver ::main_phase();

•    ···

•    while(1)  begin

•       ···

•       `uvm_do_callbacks(mac_driver, A, pre_tran());

•       ···

•end

•    ···

•endtask //main_phase

 

•class  mac_callback extends A;

•    virtual task pre_tran(mac_driver  mac_drv, ref mac_transaction tr);

•        $display(“pre_tran, the transaction is:”);

•        tr.print();

•    endtask

•    `uvm_object_utils(mac_callback);

•endclass

•

•class base_test extends uvm_test;

•    ···

•    mac_callback mac_cb;

•    ···

•    function void connect_phase ()

•        mac_cb = mac_callback::type_id::create(“mac_cb”);

•        A_pool::add(mac_env.agt.drv, mac_cb);

•        ···

•    endfunction

•endclass //mac_driver

 

VCS error information:

  Could not find member 'pre_tran' in class 'mac_driver', at 

  "../sv/04_driver/430_mac_driver.sv", 56. Instance stack trace:

      mac_pkg  ../sv/mac_pkg.sv, 2

 

Could anybody tell me why? Thanks in advance!

 

[mrforever]

Oh, my god. It's right!