-- Decoder for a segment
-- The decoder has a four-bit
-- input that encodes a numberic digit between 0 and 9.
-- There are seven outputs indexed from 'a' through 'g', corresponding
-- to the seven segments of the LED display. An output bit
-- being '1' causes the segment to light.
--
-- ___a
-- | |
-- f|___|b
-- | g |
-- e|___|c
-- d
--
LIBRARY ieee; USE ieee.std_logic_1164.all;
ARCHITECTURE spec OF segdecode IS
BEGIN
p1 : process (bcd) is
variable out_digit : std_logic_vector (6 downto 0);
begin
case bcd is
when "0000" => out_digit := "1111110";
when "0001" => out_digit := "0110000";
when "0010" => out_digit := "1101101";
when "0011" => out_digit := "1111001";
when "0100" => out_digit := "0110011";
when "0101" => out_digit := "1011011";
when "0110" => out_digit := "1011111";
when "0111" => out_digit := "1110000";
when "1000" => out_digit := "1111111";
when "1001" => out_digit := "1110011";
when others => out_digit := "0000000";
end case;
seven_seg <= out_digit;
end process p1;
END spec ;
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