鉴相器实现代码

鉴相器实现代码

鉴相器，pf_up是local相比reference朝前，pf_down是滞后， 经仿真可以实现功能。请各位评判下这样实现好不好，还有更好或可靠的方法没有，谢谢！

module top_jianxiang(reference_frq, local_frq, pf_up, pf_down );
  input reference_frq;
  input local_frq;
  output pf_up;
  output pf_down ;
  
reg pf_up,pf_down;

always @(posedge reference_frq or posedge local_frq)
  begin
  if (local_frq == 0)
   pf_down <= 1;

   else
   if (local_frq == 1)
    pf_down <= 0;
  end
  
always @(posedge reference_frq or posedge local_frq)
  begin
  if (reference_frq == 0)
   pf_up <= 1;

   else
   if (reference_frq == 1)
    pf_up <= 0;
  end
  
endmodule

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