-- EE 552 - Project
-- Dustin Demontigny 
-- February 11, 2003
-- bcd_decoder.vhd
-- converts binary to 7 segment display

library ieee;
use ieee.std_logic_1164.all;

-- digit values are assigned in package file
use work.smart_eq_pack.all;

entity bcd_decoder is
  port( 
    binary_input   : in std_logic_vector(bits-1 downto 0);
    segment_output : out std_logic_vector(led_segments-1 downto 0));
end bcd_decoder;

architecture struct of bcd_decoder is
begin
-- select the digit that corresponds to the binary input
  		with binary_input select
  			segment_output <=
 			  digit_1 when "0000",
 			  digit_2 when "0001",
 			  digit_3 when "0010",
 			  digit_4 when "0011",
 			  digit_5 when "0100",
 			  digit_6 when "0101",
 			  digit_7 when "0110",
 			  digit_8 when "0111",
 			  digit_9 when "1000",
 			  digit_0 when "1001",
 			  digit_A when "1010",
 			  digit_b when "1011",
 			  digit_C when "1100",
 			  digit_d when "1101",
 			  digit_E when "1110",
 			  digit_F when "1111",
				digit_e when others; -- displays "e" for error
end struct;