hex2led.vhd

flashing led example code

library ieee;
use ieee.std_logic_1164.all;

entity HEX2LED is
    port (
        HEX:		in		STD_LOGIC_VECTOR (3 downto 0);
	     LED:	   out	STD_LOGIC_VECTOR (6 downto 0)
        ) ;
end HEX2LED ;

architecture ARCH_NAME of HEX2LED is
begin
--HEX-to-seven-segment decoder
--	HEX:	in 	STD_LOGIC_VECTOR (3 downto 0);
--	LED:	out	STD_LOGIC_VECTOR (6 downto 0);
--
-- segment encoding
--      0
--     ---
--  5 |   | 1
--     ---   <- 6
--  4 |   | 2
--     ---
--      3
    with HEX select
	LED<=	"1111001" when "0001",   --1
		"0100100" when "0010",	 --2
		"0110000" when "0011",	 --3
		"0011001" when "0100",	 --4
		"0010010" when "0101",	 --5
		"0000010" when "0110",	 --6
		"1111000" when "0111",	 --7
		"0000000" when "1000",	 --8
		"0010000" when "1001",	 --9
		"0001000" when "1010",	 --A
		"0000011" when "1011",	 --b
	   "1000110" when "1100",	 --C
		"0100001" when "1101",	 --d
		"0000110" when "1110",	 --E
		"0001110" when "1111",	 --F
		"1000000" when others;	 --0

end ARCH_NAME ;