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uvm_blocking_get_port/uvm_blocking_get_export实现的简单模型

2011-02-23 08:42:07| 分类： SystemVerilog | 标签： |举报 |字号大中小订阅

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之前介绍了uvm_blocking_put_port/uvm_blocking_put_export, 其对应的uvm_blocking_get_port/uvm_blocking_get_export的简单模型可以照猫画虎的设计，

源代码如下：

/** 
 2  ** tlm_get.sv 
 3  ** 说明： 通过简单的模型来阐述 UVM/OVM中TLM uvm_get_port 
 4  **        和uvm_port_imp直接连接的基本原理。直接编译运行即可。 
 5  ** 作者：http://electron64.blog.163.com 
 6  */ 
 7 virtual class port_base#(type T=int) ; // 构造一个抽象类 
 8   typedef port_base#(T) this_type; 
 9   protected this_type port_handle; // 申明一个对象句柄（指针） 

  pure virtual task get_t(output T trans); // 纯虚函数，get_port和get_imp都必须以它为基类 

  function void connect(this_type port); // connect仅仅是实现对象句柄的赋值 
    port_handle = port; 
  endfunction // connect 

endclass // port_base 

class get_port#(type T=int) extends port_base#(T); 
  virtual task get_t(output T trans); 
    port_handle.get_t(trans); 
  endtask // get_t 
endclass // get_port 

class get_imp#(type T=int, type IMP=int) extends port_base#(T); 
  local IMP m_imp;  // imp表示具体实现get_t()函数的对象句柄。 
  function new(IMP imp); 
    m_imp = imp; 
  endfunction // new 

  virtual task get_t(output T trans); 
    trans = $random; 
    m_imp.get_t(trans);  // 调用实现对象对应的get_t()函数 
  endtask // get_t 

endclass // get_imp 

class producer; 
  get_imp#(int, producer) m_get_export; 
  function new(); 
    m_get_export = new(this);//将producer句柄传给get_imp中的imp变量，实现接管get_t()的最终实现 
  endfunction // new 

  task get_t(int trans); 
    $display("[INFO]: Generated the transaction:%d", trans); 
  endtask // get_t 
endclass // producer 

class consumer; 
  get_port#(int)  m_get_port; 
  function new(); 
    m_get_port = new(); 
  endfunction // new 

  task run(int num=10); 
    int trans; 
    for(int i=0; i<num; i++) begin  // 顺序产生10个int类型的transaction. 
      m_get_port.get_t(trans); 
      $display("[INFO]: Get the transaction:%d", trans); 
    end 
  endtask // run 
endclass // consumer 

module top; 
  producer p; 
  consumer c; 
  initial begin 
    p = new(); 
    c = new(); 
    c.m_get_port.connect(p.m_get_export);  //通过句柄赋值进行连接 
    c.run(); 
    #10 $finish; 
  end 
endmodule 


需要说明的是，get需要使用(output T trans)做参数，这样才能将数据通过层层函数传递到消费者。

运行结果如下：

# [INFO]: Generated the transaction: 303379748
# [INFO]: Get the transaction: 303379748
# [INFO]: Generated the transaction:-1064739199
# [INFO]: Get the transaction:-1064739199
# [INFO]: Generated the transaction:-2071669239
# [INFO]: Get the transaction:-2071669239
# [INFO]: Generated the transaction:-1309649309
# [INFO]: Get the transaction:-1309649309
# [INFO]: Generated the transaction: 112818957
# [INFO]: Get the transaction: 112818957
# [INFO]: Generated the transaction: 1189058957
# [INFO]: Get the transaction: 1189058957
# [INFO]: Generated the transaction:-1295874971
# [INFO]: Get the transaction:-1295874971
# [INFO]: Generated the transaction:-1992863214
# [INFO]: Get the transaction:-1992863214
# [INFO]: Generated the transaction:   15983361
# [INFO]: Get the transaction:   15983361
# [INFO]: Generated the transaction: 114806029
# [INFO]: Get the transaction: 114806029
# ** Note: $finish    : tlm_get.sv(72)
#    Time: 10 ns Iteration: 0 Instance: /top

其对应的UML模型图如下：

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