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【单选题】
关于以下程序，下列说法中正确的是module Learn10_2(clk,rst_n,din,pos_clk,neg_clk)input clk,rst_n,din;output pos_clk,neg_clk;reg ctrl_this,ctrl_last;always@(posedge clk or negedge rst_n)beginif(!rst_n)beginctrl_this <= 0;ctrl_last <= 0;endelse beginctrl_this <= din;ctrl_last <=ctrl_thisendendassign pos_clk = ctrl_this&(!ctrl_last)endmoduleA.
该程序的功能是上升沿检测
B.
该程序是同步复位
C.
pos_clk 是一个长度为两个时钟周期的脉宽信号
D.
该程序的功能是下降沿检测
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