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 |