--------------------------------------
-- XOR gate (ESD figure 2.3)
--
-- two descriptions provided
--------------------------------------
library ieee;
use ieee.std_logic_1164.all;
--------------------------------------
entity XOR_ent is
port( x: in std_logic;
y: in std_logic;
F: out std_logic
);
end XOR_ent;
--------------------------------------
architecture behv1 of XOR_ent is
begin
process(x, y)
begin
-- compare to truth table
if (x/=y) then
F <= '1';
else
F <= '0';
end if;
end process;
end behv1;
architecture behv2 of XOR_ent is
begin
F <= x xor y;
end behv2;
--------------------------------------
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