请教：UVM scoreboard override的问题

UVM平台中，有一个建好的my_scoreboard。
现在，有一个testcase需要使用不同的scoreboard，即在scoreboard中main_phase中需要比较不同的transaction，便想到了override功能。
新建class my_new_scoreboard extends my_scoreboard;，使用set_type_override_by_type(my_scoreboard::get_type(), my_new_scoreboard::get_type())重载，但是运行结果仍然是my_scoreboard中main_phase的行为，我期望的是重载后，希望运行my_new_scoreboard 中的代码。
使用factory.print(2)和uvm_top.print()打印重载信息和拓扑结构，结果如下：

1. #### Factory Configuration (*)
   
2. #
   
3. # No instance overrides are registered with this factory
   
4. #
   
5. # Type Overrides:
   
6. #
   
7. #Requested TypeOverride Type
   
8. #---------------------------------------
   
9. #my_scoreboardmy_new_scoreboard
   
10. # (*) Types with no associated type name will be printed as <unknown>
    
11. #
    
12. ####
    
13. 
    
14. #scbmy_new_scoreboard-@727
    
15. #act_portuvm_blocking_get_port-@1430
    
16. #exp_portuvm_blocking_get_port-@1421
    
17. #exp_port_readuvm_blocking_get_port-@1439

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my_scoreboard的源代码如下，act_port与exp_port中的transaction比较：

1. class my_scoreboard extends uvm_scoreboard;
   
2. 
   
3. traffic_trexpect_queue[$];
   
4. uvm_blocking_get_port #(traffic_tr)exp_port;
   
5. 
   
6. Read64OP_trexpect_queue_read[$];
   
7. uvm_blocking_get_port #(Read64OP_tr)exp_port_read;
   
8. 
   
9. uvm_blocking_get_port #(Response_tr)act_port;
   
10. 
    
11. `uvm_component_utils(my_scoreboard)
    
12. extern function new(string name, uvm_component parent = null);
    
13. extern virtual function void build_phase(uvm_phase phase);
    
14. extern virtual task main_phase(uvm_phase phase);
    
15. endclass
    
16. 
    
17. function my_scoreboard::new(string name, uvm_component parent = null);
    
18. super.new(name, parent);
    
19. endfunction
    
20. 
    
21. function void my_scoreboard::build_phase(uvm_phase phase);
    
22. super.build_phase(phase);
    
23. exp_port = new("exp_port", this);
    
24. act_port = new("act_port", this);
    
25. exp_port_read = new("exp_port_read", this);
    
26. endfunction
    
27. 
    
28. task my_scoreboard::main_phase(uvm_phase phase);
    
29. traffic_trget_expect, tmp_tran;
    
30. Response_tr get_actual;
    
31. bit result;
    
32. 
    
33. fork
    
34. while (1) begin
    
35. exp_port.get(get_expect);
    
36. `uvm_info("my_scoreboard", "my_scoreboard get the expect pkt, push_back it into expect_queue, and print it: ", UVM_LOW);
    
37. get_expect.print();
    
38. expect_queue.push_back(get_expect);
    
39. end
    
40. 
    
41. while (1) begin
    
42. act_port.get(get_actual);
    
43. `uvm_info("my_scoreboard", "get one actual pkt from monitor/DUT, and print it: ", UVM_LOW);
    
44. get_actual.print();
    
45. 
    
46. if(expect_queue.size() > 0) begin
    
47. tmp_tran = expect_queue.pop_front();
    
48. `uvm_info("my_scoreboard", "for comparing with expect pkt, pop_front one expect pkt from expect_queue, and print it: ", UVM_LOW);
    
49. tmp_tran.print();
    
50. 
    
51. result = (tmp_tran.exp_color==get_actual.act_color);
    
52. if(result) begin
    
53. `uvm_info("my_scoreboard: compare success", "Compare SUCCESSFULLY", UVM_LOW);
    
54. $display("the expect pkt from model is: ");
    
55. tmp_tran.print();
    
56. $display("the actual pkt from dut is: ");
    
57. get_actual.print();
    
58. end
    
59. else begin
    
60. `uvm_error("my_scoreboard: compare fail", "Compare FAILED");
    
61. $display("the expect pkt from model is: ");
    
62. tmp_tran.print();
    
63. $display("the actual pkt from dut is: ");
    
64. get_actual.print();
    
65. end
    
66. end
    
67. else begin
    
68. `uvm_error("my_scoreboard", "Received from DUT, while Expect Queue is empty");
    
69. $display("the unexpected pkt is");
    
70. get_actual.print();
    
71. end
    
72. end
    
73. join
    
74. 
    
75. endtask

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my_new_scoreboard的源代码如下，act_port与exp_port_read中的transaction比较：

1. class my_new_scoreboard extends my_scoreboard;
   
2. 
   
3. `uvm_component_utils(my_new_scoreboard)
   
4. function new(string name, uvm_component parent = null);
   
5. super.new(name, parent);
   
6. endfunction
   
7. 
   
8. virtual function void build_phase(uvm_phase phase);
   
9. super.build_phase(phase);
   
10. exp_port = new("exp_port", this);
    
11. act_port = new("act_port", this);
    
12. exp_port_read = new("exp_port_read", this);
    
13. endfunction
    
14. 
    
15. virtual task main_phase(uvm_phase phase);
    
16. Read64OP_trget_expect, tmp_tran;
    
17. Response_tr get_actual;
    
18. bit result;
    
19. 
    
20. fork
    
21. while (1) begin
    
22. exp_port_read.get(get_expect);
    
23. `uvm_info("my_new_scoreboard", "my_new_scoreboard get the expect pkt, push_back it into expect_queue_read, and print it: ", UVM_LOW);
    
24. get_expect.print();
    
25. expect_queue_read.push_back(get_expect);
    
26. end
    
27. 
    
28. while (1) begin
    
29. act_port.get(get_actual);
    
30. `uvm_info("my_new_scoreboard", "get one actual pkt from monitor/DUT, and print it: ", UVM_LOW);
    
31. get_actual.print();
    
32. 
    
33. if(expect_queue_read.size() > 0) begin
    
34. tmp_tran = expect_queue_read.pop_front();
    
35. `uvm_info("my_new_scoreboard", "for comparing with expect pkt, pop_front one expect pkt from expect_queue_read, and print it: ", UVM_LOW);
    
36. tmp_tran.print();
    
37. 
    
38. result = (tmp_tran.data0==get_actual.resp_data0) & (tmp_tran.data1==get_actual.resp_data1) &(tmp_tran.data2==get_actual.resp_data2) & (tmp_tran.data3==get_actual.resp_data3);
    
39. if(result) begin
    
40. `uvm_info("my_new_scoreboard: Read64OP compare success", "Compare SUCCESSFULLY", UVM_LOW);
    
41. $display("the expect pkt from model is: ");
    
42. tmp_tran.print();
    
43. $display("the actual pkt from dut is: ");
    
44. get_actual.print();
    
45. end
    
46. else begin
    
47. `uvm_error("my_new_scoreboard: Read64OP compare fail", "Compare FAILED");
    
48. $display("the expect pkt from model is: ");
    
49. tmp_tran.print();
    
50. $display("the actual pkt from dut is: ");
    
51. get_actual.print();
    
52. end
    
53. end
    
54. else begin
    
55. `uvm_error("my_new_scoreboard", "Received from DUT, while Expect Queue is empty");
    
56. $display("the unexpected pkt is");
    
57. get_actual.print();
    
58. end
    
59. end
    
60. join
    
61. 
    
62. endtask
    
63. 
    
64. endclass

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在testcase中，使用set_type_override_by_type重载：

1. function void case0::build_phase(uvm_phase phase);
   
2. super.build_phase(phase);
   
3. 
   
4. set_type_override_by_type(my_scoreboard::get_type(), my_new_scoreboard::get_type());
   
5. 
   
6. uvm_config_db#(uvm_object_wrapper)::set(this,
   
7. "env.agt.sqr.main_phase",
   
8. "default_sequence",
   
9. case0_seq::type_id::get());
   
10. endfunction

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运行结果却仍然是my_scoreboard中的内容：

1. UVM_ERROR my_scoreboard.sv(80) @ 10106600: uvm_test_top.env.mt_agt.scb [my_scoreboard] Received from DUT, while Expect Queue is empty
   
2. UVM_ERROR my_scoreboard.sv(80) @ 10106600: uvm_test_top.env.mt_agt.scb [my_scoreboard] Received from DUT, while Expect Queue is empty
   
3. UVM_ERROR my_scoreboard.sv(80) @ 10106600: uvm_test_top.env.mt_agt.scb [my_scoreboard] Received from DUT, while Expect Queue is empty
   
4. UVM_ERROR my_scoreboard.sv(80) @ 10106600: uvm_test_top.env.mt_agt.scb [my_scoreboard] Received from DUT, while Expect Queue is empty

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重载不成功，请教大家这个怎么解决?

my_new_scoreboard build_phase中的3个NEW去掉，好像跟重载关系不大

谢谢。这个我试了，有没有new结果都是一样的

scb你用的是new创建还是create创建的?

scb = my_scoreboard::type_id::create("scb", this);
create建的

scb = meteor3_scoreboard::type_id::create("scb", this);

小编解决了吗?
重载在new之前调用呢?

小编，既然是不同的scoreboard，那transaction是不同类型的吗?那你的driver和sequencer的参数也要override吧?

你的my_scoreboard中除了new之外的希望被重载的function和task应该加上virtual，my_new_scoreboard中的function和task前加不加vritual都可以