library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

entity pushbutton is
  port (
    sw1, sw2   : in std_logic;
    led0, led7 : out std_logic
  );
end pushbutton;

architecture synth of pushbutton is
  signal a : std_logic;
begin
  a    <= sw1 and sw2;
  led0 <= a;
  led7 <= not a;
end synth;