library ieee;
use ieee.std_logic_1164.all;

-- The inputs of this module are the ten switches SW
-- The outputs are connected to the red LEDs LEDR on the board
entity top_simple is 
port ( SW   : in      std_ulogic_vector(9 downto 0);
       LEDR : out     std_ulogic_vector(9 downto 0));
end entity top_simple;

architecture rtl of top_simple is
begin
-- Signal Assignment - The LEDR outputs are set to the
-- value of the switch inputs. Switch the switches and see
-- the LEDs go on and off.
LEDR <= SW;

-- Access one array element
-- LEDR(5) <= SW(0);

-- Constant for one element
-- LEDR(0) <= '0';

-- Constant for an array of  4 elements
-- LEDR(3 downto 0) <= "1111";

-- Access a 5 Bit subarray
-- LEDR(4 downto 0) <= SW(9 downto 5);

-- A simple boolean AND operator equation
-- LEDR(0) <= SW(0) and SW(1);

-- AND function via conditional signal assignment
-- LEDR(0) <= '1' when SW(1 downto 0) = "00" else '0';

end architecture rtl;