entity meineschaltung is port ( a: in bit_vector (3 downto 0); b: in bit_vector (3 downto 0); c: out bit_vector (3 downto 0) ); end; architecture behaviour of meineschaltung is begin c(3) <= a(3) and b(3); c(2) <= a(2) and b(2); c(1) <= a(1) and b(1); c(0) <= a(0) and b(0); end;