LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE IEEE.numeric_std.ALL;



ENTITY circuit IS
-- Declarations
 PORT( 
      clk		: IN		std_logic;
      reset	: IN    std_logic;
		fmin  : IN 		std_logic_vector(7 downto 0);
      dmout : OUT   std_logic_vector (11 DOWNTO 0)
   );
END circuit ;


ARCHITECTURE behavior OF circuit IS

   -- Architecture declarations

   -- Internal signal declarations
   SIGNAL d1     : signed(11 DOWNTO 0);
   SIGNAL d2     : signed(11 DOWNTO 0);
   SIGNAL dout   : signed(7 DOWNTO 0);
   SIGNAL output : signed(7 DOWNTO 0);
   
		
		
   -- Component Declarations
   COMPONENT multiplier
   PORT (
			clk  		: IN     std_logic ;
      reset  	: IN     std_logic ;      
			input1 	: IN     std_logic_vector (7 DOWNTO 0);
      input2 	: IN     signed (7 DOWNTO 0);
      output 	: OUT    signed (7 DOWNTO 0)
   );
   END COMPONENT;
   COMPONENT fir
   PORT (
      clock    : IN     std_logic ;
      reset    : IN     std_logic ;
      data_in  : IN     signed (11 DOWNTO 0);
      data_out : OUT    std_logic_vector (11 DOWNTO 0)
   );
   END COMPONENT;
   COMPONENT loop_filter
   PORT (
      clk   : IN     std_logic ;
      reset : IN     std_logic ;
      c     : IN     signed (7 DOWNTO 0);
      d1    : OUT    signed (11 DOWNTO 0);
      d2    : OUT    signed (11 DOWNTO 0)
   );
   END COMPONENT;
   COMPONENT nco
   PORT (
      clk   : IN     std_logic ;
      reset : IN     std_logic ;
      din   : IN     signed (11 DOWNTO 0);
      dout  : OUT    signed (7 DOWNTO 0)
   );
   END COMPONENT;
   
  
BEGIN
   -- Instance port mappings.
   I1 : multiplier
      PORT MAP (
	   clk => clk,
         reset => reset,
         input1 => fmin,
         input2 => dout,
         output => output
      );
   I4 : fir
      PORT MAP (
         clock    => clk,
         reset    => reset,
         data_in  => d1,
         data_out => dmout
      );
   I3 : loop_filter
      PORT MAP (
         clk   => clk,
         reset => reset,
         c     => output,
         d1    => d1,
         d2    => d2
      );
   I2 : nco
      PORT MAP (
         clk   => clk,
         reset => reset,
         din   => d2,
         dout  => dout
      );
    
   
   END behavior;