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[/] [xmatchpro/] [trunk/] [xmw4-comdec/] [src/] [oda_cell_2.vhd] - Blame information for rev 8

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1 8 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       = ODA_CELL     --
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--  version      = 1.0         --
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--  last update  = 30/09/99    --
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--  author       = Jose Nunez  --
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---------------------------------
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-- FUNCTION
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-- basic component cell of the Out of Date Adaptation register
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-- PIN MAP
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-- PREVIOUS : the bit on top
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-- ACTUAL   : the bit on horizontal
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-- MOVE_OUT : move output
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-- CLK : system clock
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-- RESET : asyncronous reset
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library IEEE;
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use IEEE.std_logic_1164.all;
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entity ODA_CELL_2 is
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port    (
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                        PREVIOUS : in bit;
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                        CONTROL : in bit;
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                        ACTUAL : in bit;
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                        CLK : in bit;
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                        CLEAR : in bit;
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                        RESET : in bit;
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                        MOVE_OUT : out bit
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                );
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end ODA_CELL_2;
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architecture STRUCTURAL of ODA_CELL_2 is
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signal MUX : bit;
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signal MOVE_OUT_aux : bit;
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begin
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process(CLK,RESET,CLEAR)
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begin
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        if(CLEAR='0') then
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                MOVE_OUT_aux <= '1';
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        elsif (CLK'event and CLK='1') then
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                if(RESET='0') then
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                        MOVE_OUT_aux <= '1';
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                else
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                        MOVE_OUT_aux <= MUX;
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                end if;
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        end if;
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end process;
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MUX <= ACTUAL when CONTROL = '0' else PREVIOUS;
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MOVE_OUT <= MOVE_OUT_aux;
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end STRUCTURAL;

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