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-- $Id: phase_detector.vhdl,v 1.3 2005-03-04 08:06:20 arif_endro Exp $

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-- Title       : Phase detector

-- Project     : FM Receiver 

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-- File        : phase_detector.vhdl

-- Author      : "Arif E. Nugroho" <arif_endro@yahoo.com>

-- Created     : 2004/12/18

-- Last update : 

-- Simulators  : 

-- Synthesizers: 

-- Target      : 

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-- Description : multiply input signal with signal nco

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-- Copyright (C) 2004 Arif Endro Nugroho

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-- 

--      THIS SOURCE FILE MAY BE USED AND DISTRIBUTED WITHOUT RESTRICTION

-- PROVIDED THAT THIS COPYRIGHT STATEMENT IS NOT REMOVED FROM THE FILE AND THAT

-- ANY DERIVATIVE WORK CONTAINS THE ORIGINAL COPYRIGHT NOTICE AND THE

-- ASSOCIATED DISCLAIMER.

-- 

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-- 

--      THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

-- IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

-- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO

-- EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

-- OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

-- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

-- OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

-- 

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library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

entity phase_detector is

   port (

   clock        : in  bit;

   signal_input : in  bit_vector (07 downto 0);

   signal_nco   : in  bit_vector (07 downto 0);

   phase_output : out bit_vector (07 downto 0)

   );

end phase_detector;

architecture structural of phase_detector is

   component mult_8bit

   port (

   mult_01    : in  bit_vector (07 downto 00);

   mult_02    : in  bit_vector (07 downto 00);

   result_mult: out bit_vector (15 downto 00)

   );

   end component;

   signal output_mult  : bit_vector (15 downto 0);

   begin

phase_mult: mult_8bit

   port map (

   mult_01     (07 downto 0)  => signal_input,

   mult_02     (07 downto 0)  => signal_nco,

   result_mult (15 downto 0)  => output_mult

   );

   process (clock)

   begin

   if ((clock = '1') and clock'event) then

        phase_output <= output_mult(15 downto 8);

   end if;

   end process;

end structural;