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[/] [xmatchpro/] [trunk/] [xmw4-comdec/] [xmatch_sim7/] [src/] [pointer_7.vhd] - Blame information for rev 9

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1 9 eejlny
--This library is free software; you can redistribute it and/or
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--modify it under the terms of the GNU Lesser General Public
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--License as published by the Free Software Foundation; either
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--version 2.1 of the License, or (at your option) any later version.
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--This library is distributed in the hope that it will be useful,
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--but WITHOUT ANY WARRANTY; without even the implied warranty of
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--MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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--Lesser General Public License for more details.
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--You should have received a copy of the GNU Lesser General Public
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--License along with this library; if not, write to the Free Software
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--Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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-- e_mail : j.l.nunez-yanez@byacom.co.uk
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--------------------------------------
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--  ENTITY       = POINTER_7        --
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--  version      = 1.0              --
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--  last update  = 9/05/00          --
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--  author       = Jose Nunez       --
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--------------------------------------
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-- FUNCTION
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-- first pointer
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--  PIN LIST
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--  PREVIOUS = data from the previous location in the pointer array
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--  MOVE = select if load data or keep current data
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--  CLEAR    = asynchronous clear of the data latches (active LOW)
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--  CLK      = master clock
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--  DOUT     = output of the data latches
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library ieee;
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use ieee.std_logic_1164.all;
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entity POINTER_7 is
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port
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(
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        PREVIOUS : in bit_vector(3 downto 0);
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        MOVE : in bit;
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        CLEAR : in bit ;
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        RESET : in bit;
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        CLK : in bit ;
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        DOUT : out bit_vector(3 downto 0)
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);
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end POINTER_7;
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architecture POINTER1 of POINTER_7 is
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signal DOUT_AUX : bit_vector(3 downto 0);
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begin
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FLIP_FLOPS : process (CLK,CLEAR)
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begin
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     if (CLEAR = '0') then
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            DOUT_AUX <= "0111";
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          elsif ((CLK'event) and (CLK = '1')) then
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                    if (RESET = '0') then
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                                DOUT_AUX <= "0111";
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                        elsif (MOVE = '1') then
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                                DOUT_AUX <= PREVIOUS;
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                        else
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                                        DOUT_AUX <= DOUT_AUX;
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                end if;
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        end if;
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end process FLIP_FLOPS;
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DOUT <= DOUT_AUX;
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end POINTER1;
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