Subversion Repositories p9813_rgb_led_string_driver

--

-- Package with Pullup and Pulldown

-- Useful in simulation

--

library IEEE ;

use IEEE.STD_LOGIC_1164.all;

use IEEE.NUMERIC_STD.all;

package pull_pack_sim is

  component pullup1

    port(

      pin : inout  std_logic

    );

  end component;

  component pulldn1

    port(

      pin : inout  std_logic

    );

  end component;

end pull_pack_sim;

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library IEEE ;

use IEEE.STD_LOGIC_1164.all;

use IEEE.NUMERIC_STD.all;

entity pullup1 is

  port(

    pin : inout std_logic

  );

end pullup1;

architecture beh of pullup1 is

begin

  plp: process (pin)

  begin

    if (pin = '1') then

      pin <= '1';

    elsif (pin = 'Z') then

      pin <= '1';

    else

      pin <= 'Z';

    end if;

  end process;

end beh;

library IEEE ;

use IEEE.STD_LOGIC_1164.all;

use IEEE.NUMERIC_STD.all;

entity pulldn1 is

  port(

    pin : inout  std_logic

  );

end pulldn1;

architecture beh of pulldn1 is

begin

  plp: process (pin)

  begin

    if (pin = '0') then

      pin <= '0';

    elsif (pin = 'Z') then

      pin <= '0';

    else

      pin <= 'Z';

    end if;

  end process;

end beh;