Pin-Fehlermeldung beim DE0.

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use ieee.numeric_std.ALL;

entity vga_timing1 is

port(

  clk50_in  : in std_logic;

  hs_out    : out std_logic;

  vs_out    : out std_logic;

  red_out   : OUT STD_LOGIC_VECTOR(3 downto 0);

  green_out : OUT STD_LOGIC_VECTOR(3 downto 0);

  blue_out  : OUT STD_LOGIC_VECTOR(3 downto 0)

  ); 

end vga_timing1;

architecture behavioral of vga_timing1 is

signal clk25    : std_logic:='0';

signal hcounter : integer := 0;

signal vcounter : integer := 0;

begin

process (clk50_in)

begin

  if rising_edge(clk50_in) then

    clk25 <= not clk25;

  end if;

end process;

process (clk25)

begin

  if rising_edge(clk50_in) then

    if vcounter<480 then

      if (hcounter >=  0 and hcounter < 160) then

        red_out<="1000";

      else

        red_out<="0000";

      end if;

      if (hcounter >= 160 and hcounter < 320) then

        green_out<="1000";

      else

        green_out<="0000";

      end if;

      if (hcounter >= 320 and hcounter < 480) then

        blue_out<="1000";

      else

        blue_out<="0000";

      end if;  

      if (hcounter >= 480 and hcounter < 640) then

        red_out<="1000";

        green_out<="1000";

        blue_out<="1000";

      end if;

    end if;

  end if;

end process;

process (clk25)

begin

  if rising_edge(clk25) then

    if hcounter >= (639+16) and hcounter <= (639+16+96) then

      hs_out <= '0';

    else

      hs_out <= '1';

    end if;

    if vcounter >= (479+10) and vcounter <= (479+10+2) then

      vs_out <= '0';

     else

      vs_out <= '1';

    end if;

--- horizontal counts from 0 to 799

    hcounter <= hcounter+1;

    if hcounter = 799 then

      vcounter <= vcounter+1;

      hcounter <= 0;

    end if;

--- vertical counts from 0 to 524

    if vcounter = 524 then 

      vcounter <= 0;

    end if;

  end if;

end process;

end behavioral;