mfm_to_basic.vhd

--------------------------------------------------------------------------

-- FILENAME : mfm_to_basic.vhd

--

-- Convert the MFM signal from the disk drive to a 'Basic MFM' signal.

--

-- See the final report for a description of why and what a 'Basic MFM'

-- signal is.

--

-- AUTHOR       : Craig Dunn

-- DATE STARTED : 10 December 2003

-- TAB SETTING  : 4

-- RESET        : Async (active low)

-- CLOCK        : The disk drive MFM signal

-- KNOWN BUGS   : None

-- VERSION      : 1.0

--

-- All of the design and code in this module is my own work.  No design or

-- code has been borrowed or copied from any source.

--------------------------------------------------------------------------

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;



entity mfm_to_basic is

    port ( RST          : in std_logic;

           MFM_IN       : in std_logic;

           BASIC_OUT    : out std_logic

         );

end mfm_to_basic;



architecture mfm_to_basic_arch of mfm_to_basic is

   signal basic_mfm : std_logic;

begin



   BASIC_OUT <= basic_mfm;



   main : process(RST, MFM_IN)

   begin

      if RST = '0' then

         basic_mfm <= '0';

      elsif rising_edge(MFM_IN) then

         basic_mfm <= not basic_mfm;

      end if;

   end process main;





end mfm_to_basic_arch;