UVM实战_2_TLM总结

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前言

总结《UVM实战》第4章内容

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一、put、get、transport端口

1.术语

   A为发起者(port)，B为目标(export)

• put: A发送给B一个数据
• get: A从B拿到一个数据
• transport: 相当于put+get，A发出一个请求，B返回一个应答
• peek: 复制一个数据送出去，原来的数据还在

2.PORT、EXPORT、IMP、TRANSPORT

• 优先级：port > export > imp
• 在有port, export, imp连接的data path中，有且必须以imp作为终点，否则的话，程序会报错。port, export相当于一道门，没用存储作用
• imp在声明时相较于port, export多了一个类型参数IMP，第一个参数是传输的transaction，第二个参数是实现这个接口的component
• 端口连接举例：

2.1 port-export-imp

A代码

class A extends uvm_component;
   `uvm_component_utils(A)

   uvm_blocking_put_port#(my_transaction) A_port;
   function new(string name, uvm_component parent);
      super.new(name, parent);
   endfunction

   extern function void build_phase(uvm_phase phase);
   extern virtual  task main_phase(uvm_phase phase);
endclass

function void A::build_phase(uvm_phase phase);
   super.build_phase(phase);
   A_port = new("A_port", this);
endfunction

task A::main_phase(uvm_phase phase);
   my_transaction tr;
   repeat(10) begin
      #10;
      tr = new("tr");
      assert(tr.randomize());
      A_port.put(tr);
   end
endtask

B代码

class B extends uvm_component;
   `uvm_component_utils(B)

   uvm_blocking_put_export#(my_transaction) B_export;
   uvm_blocking_put_imp#(my_transaction, B) B_imp;
   function new(string name, uvm_component parent);
      super.new(name, parent);
   endfunction

   extern function void build_phase(uvm_phase phase);
   extern function void connect_phase(uvm_phase phase);
   extern function void put(my_transaction tr);
   extern virtual  task main_phase(uvm_phase phase);
endclass

function void B::build_phase(uvm_phase phase);
   super.build_phase(phase);
   B_export = new("B_export", this);
   B_imp = new("B_imp", this);
endfunction

function void B::connect_phase(uvm_phase phase);
   super.connect_phase(phase);
   B_export.connect(B_imp);
endfunction

function void B::put(my_transaction tr);
   `uvm_info("B", "receive a transaction", UVM_LOW) 
   tr.print();
endfunction

task B::main_phase(uvm_phase phase);
endtask

env代码

class my_env extends uvm_env;

   A   A_inst;
   B   B_inst;
   
   
   function new(string name = "my_env", uvm_component parent);
      super.new(name, parent);
   endfunction

   virtual function void build_phase(uvm_phase phase);
      super.build_phase(phase);

      A_inst = A::type_id::create("A_inst", this);
      B_inst = B::type_id::create("B_inst", this);

   endfunction

   extern virtual function void connect_phase(uvm_phase phase);
   
   `uvm_component_utils(my_env)
endclass

function void my_env::connect_phase(uvm_phase phase);
   super.connect_phase(phase);
   A_inst.A_port.connect(B_inst.B_export)