uvm_subscriber

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uvm_subscriber的代码非常简单，继承于uvm_component，再加上一个analysis export而已。

其代码如下：

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virtual class uvm_subscriber #(type T=int) extends uvm_component;
  typedef uvm_subscriber #(T) this_type;
 
  uvm_analysis_imp #(T, this_type) analysis_export;
 
  function new (string name, uvm_component parent);
    super.new (name, parent);
    analysis_export = new ("analysis_imp", this);
  endfunction
 
  pure virtual function void write (T, t);
endclass

他的用法一般是，将monitor的analysis port连接到subscriber，将transaction传递过来，做function coverage。

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class my_coverage extends uvm_subscriber #(bus_pkt);
 
  covergroup cg_bus;
    ...
  endgroup
 
  virtual function void write (bus_pkt pkt);
    cg_bus.sample ();
  endfunction
endclass
 
class my_env extends uvm_env;
  ...
  virtual function void connect_phase (uvm_phase phase);
    super.connect_phase (phase);
    my_agent.custom_ap.connect (my_cov.analysis_export);
  endfunction
endclass

参考：

  1. https://www.chipverify.com/uvm/uvm-subscriber
  2. https://verificationacademy.com/verification-methodology-reference/uvm/docs_1.1c/html/files/comps/uvm_subscriber-svh.html