UVM糖果爱好者教程 - 19.Analysis FIFO

这篇文章将解释如何使用Analysis FIFO。假设我想要一个记分板来比较两种jelly beans; 一个流是用于“期望的”jelly beans，另一个是用于“实际的”jelly beans。同时假设jelly beans被异步喂入记分板。为了同步jelly beans，我使用了两个analysis FIFO：

异步jelly bean计分板

这是实现上述记分牌的示例代码。下面的代码应该是不言自明的。需要注意的是，获取FIFO的下一个项目的方法是阻塞任务（第43和44行）。不过，不管怎样，这个任务在UVM类参考文献中没有记录。

2015年2月14日：更改为明确使用get_peek_export，而不是使用未记录的获取任务。

当期望的jelly bean和实际的jelly bean都可用时，记分板将它们比较（第45行）。在完成仿真（extract_phase）之前，计分板将检查FIFO中是否有任何存在残留的jelly bean。这不容易吗？

class asynchronous_jelly_bean_scoreboard extends uvm_component;
   `uvm_component_utils( asynchronous_jelly_bean_scoreboard )
 
   uvm_analysis_export  #( jelly_bean_transaction ) expected_analysis_export;
   uvm_analysis_export  #( jelly_bean_transaction )   actual_analysis_export;
   uvm_tlm_analysis_fifo#( jelly_bean_transaction ) expected_jelly_bean_fifo;
   uvm_tlm_analysis_fifo#( jelly_bean_transaction )   actual_jelly_bean_fifo;
 
   // Function: new
   //-------------------------------------------------------------------------
   function new( string name, uvm_component parent );
      super.new( name, parent );
   endfunction: new
 
   // Function: build_phase
   //-------------------------------------------------------------------------
   virtual function void build_phase( uvm_phase phase );
      super.build_phase( phase );
 
      expected_analysis_export = new( "expected_analysis_export", this );
        actual_analysis_export = new(   "actual_analysis_export", this );
      expected_jelly_bean_fifo = new( "expected_jelly_bean_fifo", this );
        actual_jelly_bean_fifo = new(   "actual_jelly_bean_fifo", this );
   endfunction: build_phase
 
   // Function: connect_phase
   //-------------------------------------------------------------------------
   virtual function void connect_phase( uvm_phase phase );
      super.connect_phase( phase );
 
      expected_analysis_export.connect( expected_jelly_bean_fifo.analysis_export );
        actual_analysis_export.connect(   actual_jelly_bean_fifo.analysis_export );
   endfunction: connect_phase
 
   // Task: main_phase
   //-------------------------------------------------------------------------
   virtual task main_phase( uvm_phase phase );
      jelly_bean_transaction expected_jelly_bean;
      jelly_bean_transaction   actual_jelly_bean;
 
      super.main_phase( phase );
      forever begin
         expected_jelly_bean_fifo.get_peek_export.get( expected_jelly_bean );
           actual_jelly_bean_fifo.get_peek_export.get(   actual_jelly_bean );
         if ( expected_jelly_bean.compare( actual_jelly_bean ) == 0 ) begin
            `uvm_error( "main_phase", 
                        { "jelly bean mismatch: ",
                          "expected:", expected_jelly_bean.convert2string(),
                          "actual:",     actual_jelly_bean.convert2string() } )
         end
      end
   endtask: main_phase
 
   // Function: extract_phase - checks leftover jelly beans in the FIFOs
   //-------------------------------------------------------------------------
   virtual function void extract_phase( uvm_phase phase );
      jelly_bean_transaction jelly_bean;
 
      super.extract_phase( phase );
      if ( expected_jelly_bean_fifo.try_get( jelly_bean ) ) begin
         `uvm_error( "expected_jelly_bean_fifo", 
                     { "found a leftover jelly bean: ", jelly_bean.convert2string() } )
      end
 
      if ( actual_jelly_bean_fifo.try_get( jelly_bean ) ) begin
         `uvm_error( "actual_jelly_bean_fifo",
                     { "found a leftover jelly bean: ", jelly_bean.convert2string() } )
      end
   endfunction: extract_phase
endclass: asynchronous_jelly_bean_scoreboard

您可以在EDA Playground上查看和编译代码。

UVM糖果爱好者教程 - 19.Analysis FIFO

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