uvm_monitor——借我一双慧眼

　　monitor 用来捕获（监视）和检查总线的信号是否满足预期的要求。所有的user_monitor 继承自uvm_monitor，uvm_monitor继承自uvm_component，从源代码来看里面没有做什么工作，那为什么又费力去做这么一件事，这么做的原因是让不同的模块做不同事，从名字就可以区分开该模块的功能，提供代码的可阅读性。
A monitor should have the following functions :
　　• Collect bus information through a virtual interface
　　• Collected data can be used for protocol checking and coverage
　　• Collected data is exported via an analysis port

//-----------------------------------------------------------------------------
// CLASS: uvm_monitor
//
// This class should be used as the base class for user-defined monitors. 
//
// Deriving from uvm_monitor allows you to distinguish monitors from generic
// component types inheriting from uvm_component.  Such monitors will
// automatically inherit features that may be added to uvm_monitor in the future.
//
//-----------------------------------------------------------------------------

virtual class uvm_monitor extends uvm_component;

  // Function: new
  //
  // Creates and initializes an instance of this class using the normal
  // constructor arguments for <uvm_component>: ~name~ is the name of the
  // instance, and ~parent~ is the handle to the hierarchical parent, if any.

  function new (string name, uvm_component parent);
    super.new(name, parent);
  endfunction

  const static string type_name = "uvm_monitor";

  virtual function string get_type_name ();
    return type_name;
  endfunction

endclass

参考文献：

1 uvm_monitor. http://www.chipverify.com/uvm/monitor