50MHZ 時鐘脈波除頻轉成1Hz標準脈波

源自於

http://www.worlduc.com/blog2012.aspx?bid=16544240

//div50MHZ.v

module div50MHZ(clk_50MHZ,clk_1HZ);

input clk_50MHZ;

output clk_1HZ;

reg  clk_1HZ;

reg   cnt=24999999;

always@(posedge clk_50MHZ)

   if(cnt==24999999)

       begin

           cnt<=0;

           clk_1HZ<=~clk_1HZ;

       end

   else

       cnt<=cnt+1'b1;

endmodule