VHDL Course

hw.vhd

-- hw.vhd
-- Hello World in VHDL
-- Switch an LED in response to a button

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity LED_Switch is
	Port (  switch_0 : in STD_LOGIC;
		LED_0 : out STD_LOGIC );
end LED_Switch;

architecture Behavioral of LED_Switch is
begin
	LED_0 <= switch_0;
end Behavioral;

logical.vhd

-- logical.vhd
-- Logical operations (AND, OR, XOR)

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity LED_Switch is
	Port (  LED_0 : out STD_LOGIC;
		LED_1 : out STD_LOGIC;
		Switch_0 : in STD_LOGIC;
		Switch_1 : in STD_LOGIC );
end LED_Switch

architecture Behavioral of LED_Switch is
begin
	LED_0 <= Switch_1 AND Switch_0;
	LED_1 <= Switch_1 OR Switch_0;
end Behavioral;

From Mark Fields' VHDL/FPGA course