count_25.txt

带左拐的交通灯设计与25进制的加法计数器

module count_25(clk,reset,cnt_25);
output [4:0]cnt_25;
input clk,reset;
reg [4:0]cnt_25;
always @ ( posedge clk or posedge reset)
  begin
   if( reset)
     cnt_25 <= 5'b00000;
   else
     if( cnt_25 == 5'b00000)
       cnt_25 <= 5'b11000;
     else
       cnt_25<= cnt_25 - 5'b00001;
  end 
endmodule