Subversion Repositories product_code_iterative_decoder

-- $Id: comparator_7bit.vhdl,v 1.1.1.1 2005-11-15 01:52:30 arif_endro Exp $

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

-- Title       : 7 bit comparator

-- Project     : 

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

-- File        : comparator_7bit.vhdl

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

-- Created     : 2005/11/01

-- Last update : 

-- Simulators  :

-- Synthesizers: 

-- Target      : 

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

-- Description : Compare two input ( 7 bit signal )

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

-- Copyright (C) 2005 Arif Endro Nugroho

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

-- 

--      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.

-- 

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

-- 

--      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.

-- 

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

library IEEE;

use IEEE.std_logic_1164.all;

entity comparator_7bit is

   port (

   a_7bit_i   : in  bit_vector (06 downto 00);

   b_7bit_i   : in  bit_vector (06 downto 00);

   a_eq_b     : out bit;

   a_gt_b     : out bit;

   a_lt_b     : out bit

   );

end comparator_7bit;

architecture structural of comparator_7bit is

   component bit_comparator

       port (

          a_i   : in  bit;

          b_i   : in  bit;

          eq_i  : in  bit;

          gt_i  : in  bit;

          lt_i  : in  bit;

          eq_o  : out bit;

          gt_o  : out bit;

          lt_o  : out bit

          );

   end component;

signal eq_i_0 : bit;

signal gt_i_0 : bit;

signal lt_i_0 : bit;

signal eq_o_0 : bit;

signal gt_o_0 : bit;

signal lt_o_0 : bit;

signal eq_o_1 : bit;

signal gt_o_1 : bit;

signal lt_o_1 : bit;

signal eq_o_2 : bit;

signal gt_o_2 : bit;

signal lt_o_2 : bit;

signal eq_o_3 : bit;

signal gt_o_3 : bit;

signal lt_o_3 : bit;

signal eq_o_4 : bit;

signal gt_o_4 : bit;

signal lt_o_4 : bit;

signal eq_o_5 : bit;

signal gt_o_5 : bit;

signal lt_o_5 : bit;

signal eq_o_6 : bit;

signal gt_o_6 : bit;

signal lt_o_6 : bit;

begin

eq_i_0 <= '1'; -- 20051015 Fixed

gt_i_0 <= '0';

lt_i_0 <= '0';

a_eq_b <= eq_o_6;

a_gt_b <= gt_o_6;

a_lt_b <= lt_o_6;

cmp6 : bit_comparator

   port map (

     a_i   =>  a_7bit_i (06),

     b_i   =>  b_7bit_i (06),

     eq_i  =>  eq_o_5,

     gt_i  =>  gt_o_5,

     lt_i  =>  lt_o_5,

     eq_o  =>  eq_o_6,

     gt_o  =>  gt_o_6,

     lt_o  =>  lt_o_6

     );

cmp5 : bit_comparator

   port map (

     a_i   =>  a_7bit_i (05),

     b_i   =>  b_7bit_i (05),

     eq_i  =>  eq_o_4,

     gt_i  =>  gt_o_4,

     lt_i  =>  lt_o_4,

     eq_o  =>  eq_o_5,

     gt_o  =>  gt_o_5,

     lt_o  =>  lt_o_5

     );

cmp4 : bit_comparator

   port map (

     a_i   =>  a_7bit_i (04),

     b_i   =>  b_7bit_i (04),

     eq_i  =>  eq_o_3,

     gt_i  =>  gt_o_3,

     lt_i  =>  lt_o_3,

     eq_o  =>  eq_o_4,

     gt_o  =>  gt_o_4,

     lt_o  =>  lt_o_4

     );

cmp3 : bit_comparator

   port map (

     a_i   =>  a_7bit_i (03),

     b_i   =>  b_7bit_i (03),

     eq_i  =>  eq_o_2,

     gt_i  =>  gt_o_2,

     lt_i  =>  lt_o_2,

     eq_o  =>  eq_o_3,

     gt_o  =>  gt_o_3,

     lt_o  =>  lt_o_3

     );

cmp2 : bit_comparator

   port map (

     a_i   =>  a_7bit_i (02),

     b_i   =>  b_7bit_i (02),

     eq_i  =>  eq_o_1,

     gt_i  =>  gt_o_1,

     lt_i  =>  lt_o_1,

     eq_o  =>  eq_o_2,

     gt_o  =>  gt_o_2,

     lt_o  =>  lt_o_2

     );

cmp1 : bit_comparator

   port map (

     a_i   =>  a_7bit_i (01),

     b_i   =>  b_7bit_i (01),

     eq_i  =>  eq_o_0,

     gt_i  =>  gt_o_0,

     lt_i  =>  lt_o_0,

     eq_o  =>  eq_o_1,

     gt_o  =>  gt_o_1,

     lt_o  =>  lt_o_1

     );

cmp0 : bit_comparator

   port map (

     a_i   =>  a_7bit_i (00),

     b_i   =>  b_7bit_i (00),

     eq_i  =>  eq_i_0,

     gt_i  =>  gt_i_0,

     lt_i  =>  lt_i_0,

     eq_o  =>  eq_o_0,

     gt_o  =>  gt_o_0,

     lt_o  =>  lt_o_0

     );

end structural;