uvm_object ——太极

无极生太极——无名天地之始

太极生两仪——有名万物之母

 

文件：

$UVM_HOME/src/base/uvm_object.svh

类：

uvm_object

　　The uvm_object class is the base class for all UVM data and hierarchical classes. Its primary role is to define a set of methods for such common operations as create, copy, compare, print, and record.(金木水火土).

//------------------------------------------------------------------------------
//
// CLASS: uvm_object
//
// The uvm_object class is the base class for all UVM data and hierarchical 
// classes. Its primary role is to define a set of methods for such common
// operations as <create>, <copy>, <compare>, <print>, and <record>. Classes
// deriving from uvm_object must implement the pure virtual methods such as 
// <create> and <get_type_name>.
//
//------------------------------------------------------------------------------

virtual class uvm_object extends uvm_void;


  // Function: new
  //
  // Creates a new uvm_object with the given instance ~name~. If ~name~ is not
  // supplied, the object is unnamed.

  extern function new (string name="");


  // Group: Seeding

  // Variable: use_uvm_seeding
  //
  // This bit enables or disables the UVM seeding mechanism. It globally affects
  // the operation of the <reseed> method.
  //
  // When enabled, UVM-based objects are seeded based on their type and full
  // hierarchical name rather than allocation order. This improves random
  // stability for objects whose instance names are unique across each type.
  // The <uvm_component> class is an example of a type that has a unique
  // instance name.

  static bit use_uvm_seeding = 1;
  ......

endclass

 

　　uvm_void 是不能使用的，而必须有一个实体那就是uvm_object. 很多类都派生自uvm_object，比如uvm_component，uvm_transaction，uvm_reg等等。还可以被用作 cfg 配置的基类。总之uvm_object是UVM框架的基石。

　　如果uvm_void 是无极，可以认为uvm_object是太极。道是看不见，是混沌，太极是可以感受的。是故，易有太极，是生两仪，两仪生四象，四象生八卦，八卦定吉凶，吉凶生大业。

 

 

问题：

1 what is UVM seeding mechanism?

参考文献：

1 uvm_object. http://blog.sina.com.cn/s/blog_466496f30100yc75.html