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--This library is free software; you can redistribute it and/or

--modify it under the terms of the GNU Lesser General Public

--License as published by the Free Software Foundation; either

--version 2.1 of the License, or (at your option) any later version.

--This library is distributed in the hope that it will be useful,

--but WITHOUT ANY WARRANTY; without even the implied warranty of

--MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

--Lesser General Public License for more details.

--You should have received a copy of the GNU Lesser General Public

--License along with this library; if not, write to the Free Software

--Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

-- e_mail : j.l.nunez-yanez@byacom.co.uk

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

--  ENTITY       = ODA_REGISTER--

--  version      = 1.0         --

--  last update  = 19/09/99    --

--  author       = Jose Nunez  --

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

-- FUNCTION

-- register that creates the out of order adaptation mechanism

-- PIN MAP

-- MOVE_IN : current move vector

-- CONTROL : decides if the vector is loaded directly or one position down

-- CLK : clock signal

-- RESET : reset signal

-- MOVE_OUT : previous move vector

library IEEE;

use IEEE.std_logic_1164.all;

entity ODA_REGISTER is

port    (

                        MOVE_IN : in bit_vector(15 downto 0);

                        MASK_IN : in bit;

                        CONTROL : in bit_vector(14 downto 0);

                        ENABLE : in bit;

                        CLK : in bit;

                        CLEAR : in bit;

                        RESET : in bit;

                        MASK_OUT : out bit;

                        MOVE_OUT : out bit_vector(15 downto 0)

                );

end ODA_REGISTER;

architecture STRUCTURAL of ODA_REGISTER is

component ODA_CELL_2

port    (

                        PREVIOUS : in bit;

                        CONTROL : in bit;

                        ACTUAL : in bit;

                        CLK : in bit;

                        CLEAR : in bit;

                        RESET : in bit;

                        MOVE_OUT : out bit

                );

end component;

signal zero : bit;

signal MOVE_OUT_AUX : bit_vector(15 downto 0);

signal MOVE_IN_AUX : bit_vector(15 downto 0);

signal CONTROL_AUX : bit_vector (14 downto 0);

signal MASK_OUT_AUX : bit;

begin

zero <='0';

PRI_DEC : for I in 15 downto 0 generate

        FIRST : if (I=15) generate

        CELL_1 : ODA_CELL_2

                port map( PREVIOUS => zero,

                                  CONTROL => CONTROL_AUX(0),

                          ACTUAL => MOVE_IN_AUX(15),

                                  CLK => CLK,

                                  CLEAR => CLEAR,

                                  RESET => RESET,

                                  MOVE_OUT => MOVE_OUT_AUX(15)

                                  );

         end generate;

         REMAINING : if (I<15) generate

         REST : ODA_CELL_2

                port map( PREVIOUS => MOVE_IN(I+1),

                                  CONTROL => CONTROL_AUX(14-I),

                          ACTUAL => MOVE_IN_AUX(I),

                                  CLK => CLK,

                                  CLEAR => CLEAR,

                                  RESET => RESET,

                                  MOVE_OUT => MOVE_OUT_AUX(I)

                                  );

         end generate;

end generate;

MASK_FF : process (CLK,CLEAR)

begin

if (CLEAR = '0') then

        MASK_OUT_AUX <= '1';

elsif ((CLK'event) and (CLK = '1')) then

        if (RESET = '0') then

                MASK_OUT_AUX <= '1';

        elsif (ENABLE = '0') then

                MASK_OUT_AUX <= MASK_IN;

        else

                MASK_OUT_AUX <= MASK_OUT_AUX;

        end if;

end if;

end process MASK_FF;

CONTROL_AUX <= CONTROL when ENABLE = '0' else "000000000000000";

MOVE_IN_AUX <= MOVE_IN when ENABLE = '0' else MOVE_OUT_AUX;

MOVE_OUT <= MOVE_OUT_AUX;

MASK_OUT <= MASK_OUT_AUX;

end STRUCTURAL;