uvm scoreboard 示例

以下是一个简单的UVM评分板（Scoreboard）的示例，用于检查接收到的事务与期望的结果是否匹配：

class my_scoreboard extends uvm_scoreboard;
   `uvm_component_utils(my_scoreboard)

   // Declare analysis port for receiving transactions
   uvm_analysis_port #(my_transaction) analysis_port;

   // Override the build_phase to connect the analysis port
   virtual function void build_phase(uvm_phase phase);
      super.build_phase(phase);

      // Connect the analysis port to the scoreboard's analysis_export
      analysis_port = new("analysis_port", this);
   endfunction

   // Override the write method to check received transactions
   virtual function void write(my_transaction txn);
      super.write(txn);

      // Check the received transaction against expected results
      if (txn.result == txn.expected_result)
         `uvm_info("SCOREBOARD", $sformatf("Transaction %0d passed", txn.transaction_id), UVM_MEDIUM)
      else
         `uvm_error("SCOREBOARD", $sformatf("Transaction %0d failed", txn.transaction_id))
   endfunction
endclass

在上面的示例中，`my_scoreboard`是一个UVM评分板，它用于检查接收到的`my_transaction`类型的事务与期望的结果是否匹配。在`build_phase`中，评分板创建了一个分析端口（`analysis_port`）并将其连接到评分板的`analysis_export`。

评分板的`write`方法被重写以检查接收到的事务。在该方法中，评分板比较事务的`result`字段与`expected_result`字段，如果它们匹配，则打印一条通过的信息；否则，打印一条失败的信息。

以上是一个简单的UVM评分板示例，它展示了如何在UVM中创建和使用评分板来检查接收到的事务与期望的结果是否匹配。具体实现中，你需要根据你的需求进行适当的修改和扩展。