uvm:9.1.6 use callback functions/tasks to implement all test cases

1. You can also move the DRIVE_ONE_PKT in the driver to Pre_tran. Further, it is also possible to move Seq_item_port.get_next_item to Pre_tran.

2. In fact, all the test cases can be implemented without sequence, only with callback. Suppose Class A is as follows:

3. In My_driver main_phase, remove all other code and call a run only:

4. To create a new test case, you only need to derive a class from a and overload its Gen_tran function:

1) The new test case is equivalent to the overloaded Gen_tran. If you do not meet the requirements, you can also overload the type a run.

2) control the objection in run, the excitation is generated in the Gen_tran.

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uvm:9.1.6 use callback functions/tasks to implement all test cases