counter.v

数字钟设计

module counter(
              minute_led_1,//outputs
              minute_led_2,
              hour_led_1,
              hour_led_2,
              pm_am_led,
              reset_b, //inputs
              clk,
              pm_am_in,
              hour_led_11, 
              hour_led_22,
              minute_led_11,
              minute_led_22,
              setup_enable,
              sel);
output   [6:0] minute_led_1;
output   [6:0] minute_led_2;
output   [6:0] hour_led_1;
output   [6:0] hour_led_2;
output         pm_am_led;
input          pm_am_in;
input          clk;
input          reset_b;
input          setup_enable;
input          sel;
input     [6:0]hour_led_11;
input     [6:0]hour_led_22;
input     [6:0]minute_led_11;
input     [6:0]minute_led_22;
reg      [6:0] minute_led_1;
reg      [6:0] minute_led_2;
reg      [6:0] hour_led_1;
reg      [6:0] hour_led_2;
reg      [6:0] second_led_1;
reg      [6:0] second_led_2;
reg      [14:0]count;
reg            pm_am_led;
always@(posedge clk or negedge reset_b)
 begin
  if(!reset_b)
   begin
   count<=0;
   end
   else
   if(count==15'h7fff) //count==14'h3fff
   begin
   count<=0;
   end
   else
   count<=count+1;
 end


always@(posedge clk or negedge reset_b)
 begin
  if(!reset_b)
   begin
    second_led_1<=0;
    second_led_2<=0;
    minute_led_1<=0;
    minute_led_2<=0;
    hour_led_1<=0;
    hour_led_2<=0;
    pm_am_led<=0;
    count<=0;
   end
  else if(setup_enable&&!sel)
   begin
    minute_led_1<=minute_led_11;
    minute_led_2<=minute_led_22;
    hour_led_1<=hour_led_11;
    hour_led_2<=hour_led_22;
    pm_am_led<=pm_am_in;
   end
  else
   begin
    if(count==15'h7fff)
    if(second_led_2==9)
     begin
      second_led_2<=0;
      if(second_led_1==5)
       begin
        second_led_1<=0;
         if(minute_led_2==9)
          begin
           minute_led_2<=0;
            if(minute_led_1==5)
             begin
              minute_led_1<=0;
              if(hour_led_2==9)
               begin
                hour_led_2<=0;
                hour_led_1<=hour_led_1+1;
               end
              else if(hour_led_2==1&&hour_led_1==1)
               begin
                hour_led_1<=0;
                hour_led_2<=0;
                pm_am_led<=~pm_am_led;
               end
              else
               hour_led_2<=hour_led_2+1;
             end
            else
            minute_led_1<=minute_led_1+1;
          end
         else
          minute_led_2<=minute_led_2+1;
       end
      else
       second_led_1<=second_led_1+1;
     end
    else
     second_led_2<=second_led_2+1; 
   end
 end
endmodule