-- $Id: bit_comparator.vhdl,v 1.1.1.1 2005-11-15 01:52:30 arif_endro Exp $
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-- ------------------------------------------------------------------------
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-------------------------------------------------------------------------------
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-- Title : Bit comparator
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-- Project :
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-------------------------------------------------------------------------------
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-- File : bit_comparator.vhdl
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-- Author : "Arif E. Nugroho" <arif_endro@yahoo.com>
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-- Created : 2005/11/01
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-- Last update :
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-- Simulators :
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-- Synthesizers:
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-- Target :
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-------------------------------------------------------------------------------
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-- Description : Compare two input
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-------------------------------------------------------------------------------
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-- Copyright (C) 2005 Arif Endro Nugroho
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-- Copyright (C) 2005 Arif Endro Nugroho
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-------------------------------------------------------------------------------
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-- All rights reserved.
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--
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--
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-- THIS SOURCE FILE MAY BE USED AND DISTRIBUTED WITHOUT RESTRICTION
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-- Redistribution and use in source and binary forms, with or without
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-- PROVIDED THAT THIS COPYRIGHT STATEMENT IS NOT REMOVED FROM THE FILE AND THAT
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-- modification, are permitted provided that the following conditions
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-- ANY DERIVATIVE WORK CONTAINS THE ORIGINAL COPYRIGHT NOTICE AND THE
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-- are met:
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-- ASSOCIATED DISCLAIMER.
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--
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--
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-------------------------------------------------------------------------------
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-- 1. Redistributions of source code must retain the above copyright
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-- notice, this list of conditions and the following disclaimer.
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-- 2. Redistributions in binary form must reproduce the above copyright
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-- notice, this list of conditions and the following disclaimer in the
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-- documentation and/or other materials provided with the distribution.
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--
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--
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-- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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-- THIS SOFTWARE IS PROVIDED BY ARIF ENDRO NUGROHO "AS IS" AND ANY EXPRESS
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-- IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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-- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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-- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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-- EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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-- DISCLAIMED. IN NO EVENT SHALL ARIF ENDRO NUGROHO BE LIABLE FOR ANY
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-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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-- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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-- OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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-- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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-- OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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-- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-- ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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-- POSSIBILITY OF SUCH DAMAGE.
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--
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--
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-------------------------------------------------------------------------------
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-- End Of License.
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-- ------------------------------------------------------------------------
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library IEEE;
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library IEEE;
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use IEEE.std_logic_1164.all;
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use IEEE.std_logic_1164.all;
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entity bit_comparator is
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entity bit_comparator is
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port (
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port (
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a_i : in bit;
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a_i : in bit;
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b_i : in bit;
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b_i : in bit;
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eq_i : in bit;
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eq_i : in bit;
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gt_i : in bit;
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gt_i : in bit;
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lt_i : in bit;
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lt_i : in bit;
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eq_o : out bit;
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eq_o : out bit;
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gt_o : out bit;
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gt_o : out bit;
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lt_o : out bit
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lt_o : out bit
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);
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);
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end bit_comparator;
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end bit_comparator;
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architecture data_flow of bit_comparator is
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architecture data_flow of bit_comparator is
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begin
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begin
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lt_o <= (((not(a_i) and lt_i) or (b_i and lt_i)) or (not(a_i) and b_i));
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lt_o <= (((not(a_i) and lt_i) or (b_i and lt_i)) or (not(a_i) and b_i));
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eq_o <= (((a_i and b_i) and eq_i) or ((not(a_i) and not(b_i)) and eq_i));
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eq_o <= (((a_i and b_i) and eq_i) or ((not(a_i) and not(b_i)) and eq_i));
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gt_o <= (((a_i and gt_i) or (not(b_i) and gt_i)) or (a_i and not(b_i)));
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gt_o <= (((a_i and gt_i) or (not(b_i) and gt_i)) or (a_i and not(b_i)));
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end data_flow;
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end data_flow;
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