--======================================================================

library ieee;
use ieee.std_logic_1164.all;

-- This is just a very simple mapping component, really, to get from LED numbers
-- to more or less descriptive names. 

entity dth_tcds_user_leds is
  port (
    user_led_top_left : in std_logic;
    user_led_top_right_of_left : in std_logic;
    user_led_top_left_of_right : in std_logic;
    user_led_top_right : in std_logic;
    
    user_led_bottom_left : in std_logic;
    user_led_bottom_right_of_left : in std_logic;
    user_led_bottom_left_of_right : in std_logic;
    user_led_bottom_right : in std_logic;

    user_led_connections : out std_logic_vector(7 downto 0)
  );
end dth_tcds_user_leds;

architecture structural of dth_tcds_user_leds is

begin

  -- NOTE: These LEDs are connected via pull-ups, so connecting a
  -- low signal lights them up. Since it is easier to think in terms
  -- of positive logic, the external driving signals here are inverted.

  user_led_connections(0) <= not user_led_bottom_right;
  user_led_connections(1) <= not user_led_bottom_left_of_right;
  user_led_connections(2) <= not user_led_bottom_right_of_left;
  user_led_connections(3) <= not user_led_bottom_left;
  user_led_connections(4) <= not user_led_top_right;
  user_led_connections(5) <= not user_led_top_left_of_right;
  user_led_connections(6) <= not user_led_top_right_of_left;
  user_led_connections(7) <= not user_led_top_left;

end structural;

--======================================================================