-- BCD to 7 segment LED display converter
-- written by Anco Snip / John Forcadas
-- _________________________________________
-- This is generally reusable VHDL code.  count0 is a 4 bit BCD count.
--  The LED display is as shown below.
-- Both common anode and common cathode implementations are shown.
-- DISPLAY FORMAT AND OUTPUTS:
--			______7______
--		8	|				| 9
--			|				|
--			-----10------
--		11	|				|	12
--			|___________|
--					13
--						

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;

entity displayc is
		port(count0: in std_logic_vector(0 to 3); output7, output8, output9, output10, 
			output11, output12, output13: out std_logic);
end displayc;

architecture LED of displayc is
begin
			-- COMMON ANODE			
			output7 <= not(count0(0) or (count0(1) and count0(3)) or (not count0(0) and count0(2)) or
							(not count0(0) and not count0(1) and not count0(3)));
			output8 <= not(count0(0) or (not count0(2) and not count0(3)) or (not count0(2) and count0(1))
									or (not count0(3) and count0(1)));
			output9 <= not(count0(0) or not count0(1) or (not count0(2) and not count0(3)) or
									(count0(2) and count0(3)));
			output10 <= not(count0(0) or (not count0(2) and count0(1)) or (count0(2) and not count0(3)) or
									 (not count0(1) and count0(2)));
			output11 <= not((count0(2) and not count0(3)) or (not count0(3) and not count0(1)));
			output12 <= not(count0(3) or not count0(2) or count0(1));
			output13 <= not(count0(0) or (not count0(3) and not count0(1)) or (not count0(2) and 
									count0(3) and count0(1)) or (count0(2) and not count0(3)) or 
									(count0(2) and not count0(1)));

			-- COMMON CATHODE
--			output7 <= (count0(0) or (count0(1) and count0(3)) or (not count0(0) and count0(2)) or
--							(not count0(0) and not count0(1) and not count0(3)));
--			output8 <= (count0(0) or (not count0(2) and not count0(3)) or (not count0(2) and count0(1))
--									or (not count0(3) and count0(1)));
--			output9 <= (count0(0) or not count0(1) or (not count0(2) and not count0(3)) or
--									(count0(2) and count0(3)));
--			output10 <= (count0(0) or (not count0(2) and count0(1)) or (count0(2) and not count0(3)) or
--									 (not count0(1) and count0(2)));
--			output11 <= ((count0(2) and not count0(3)) or (not count0(3) and not count0(1)));
--			output12 <= (count0(3) or not count0(2) or count0(1));
--			output13 <= (count0(0) or (not count0(3) and not count0(1)) or (not count0(2) and 
--									count0(3) and count0(1)) or (count0(2) and not count0(3)) or 
--									(count0(2) and not count0(1)));

end LED;