Subversion Repositories xmatchpro

--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;