UVM中的class--2

1)uvm_component从uvm_report_object继承而来，提供的功能包括：

              1)Hierarchy,-----searching and traversing component hierachy

                       

              2)Phasing-----调用uvm_phase以及预先定义的很多phase

                       

                      

              3)config-------调用config_db的methods

                       

              4)report-------调用uvm_report的methods

                        

              5)Factory-----调用factory的methods

                        

              6)Transaction recording-----调用recording的methods

Callbacks Classes用来做registration/user-defined的callback

   uvm_callbacks,实现callback的注册，

   uvm_callback，自定义callback的基类。

2)uvm_callbacks#(T,CB)，T表示基本的object类型，CB表示定义的callback，完成注册。

3)uvm_callback------------function callback_mode(Enable/disable callbacks)像constraint mode

                                                   is_enabled(返回callback的enable/disable)

4)uvm_test，用户自定义的test的虚基类，run_test必须放在initial内部。

                    virtual class uvm_test extends uvm_component

                    并没有很多新的variable和methods

5)uvm_env,hierarchy上的container，包含其他的component，来组成和一个整体。

                    virtual class uvm_test extends uvm_component

                    并没有很多新的variable和methods

6)uvm_agent, virtual class uvm_agent extends uvm_component

                    新加一个virtual function get_is_active(),返回1表示UVM_ACTIVE，返回零表示UVM_PASSIVE

7)uvm_monitor, virtual class uvm_monitor extends uvm_component

                    并没有很多新的variable和methods

8)uvm_scoreboard, virtual class uvm_scoreboard extends uvm_component

                    并没有很多新的variable和methods

9)uvm_driver, virtual class uvm_driver extends uvm_component

                    uvm_driver #(REQ, RSP)

                    新增的port，seq_item_port(request items from sequencer)

                                      rsp_port(sending responses)

10)uvm_subscriber, virtual class uvm_subscriber extends uvm_component

                    uvm_subscriber #(T)

                    新增的port，analysis port(提供给write函数)

                    新增的methods，write(pure virtual class)

11)Comparators,应用在transaction的比较，从DUT出来的和expected results

                    uvm_in_order_comparator #(T,comp_type,convert,pair_type)

                    新增的port，before_export：一个transaction从这个port写入

                                     after_export：另一个transaction从这个port写入

                                     pair_ap：comparator输出transaction从这个analysis port

                    新增的methods(virtual function)：set m_matches和m_mismatches为零。

12)uvm_sequence_item：用户自定义transaction的基类，从uvm_transaction继承来

                    virtual function---set_sequencer()

                    function---get_sequencer()/uvm_report_info/warning/error/fatal

                    virtual task---start_item()/finish_item()/

13)uvm_sequence_base：

                    class uvm_phase starting_phase

                    virtual task---start()/pre_body()/pre_do()/mid_do()/body()/post_do()/start_item/finish_item/wait_for_grant

                    task----lock()/grab()/

                    function---set_priority()/unlock()/ungrab()/

14)uvm_sequence(virtual) #(uvm_sequence_item, REQ)

                    function---send_request(uvm_sequence_item req)/

                    virtual task---get_response(RSP)

15)uvm_sequencer_base,从uvm_component继承而来，

16)uvm_sequencer_param_base #(REQ= uvm_sequence_item, RSP)

17)uvm_sequencer #(REQ = uvm_sequence_item, RSP)

                新增port：seq_item_export

18)uvm_push_sequencer #(REQ = uvm_sequence_item, RSP)

                新增port：req_port