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       = PIPELINE_RO      --

--  version      = 1.0              --

--  last update  = 1/08/99          --

--  author       = Jose Nunez       --

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

-- FUNCTION

-- pipeline RO is situated between the two parts of best match

-- decision logic.

-- PIN LIST

-- DOWN_PRIORITY_6_IN : Priority 6

-- DOWN_PRIORITY_5_IN : Priority 5

-- DOWN_PRIORITY_4_IN : Priority 4 

-- DOWN_PRIORITY_3_IN : Priority 3

-- DOWN_PRIORITY_2_IN : Priority 2

-- DOWN_PRIORITY_1_IN : Priority 1 ( lowest priority)

-- SAME_LENGTH : same length detected

-- MATCH_TYPE_A_IN : Type A ( most significant )

-- MATCH_TYPE_B_IN : Type B

-- MATCH_TYPE_C_IN : Type C

-- MATCH_TYPE_D_IN : Type D ( less significant )

-- SEARCH_STRING_IN : literals

-- MASK_IN : 5 bit corresponding to the mask

-- COLUMN_OR_IN : priority 5 or

-- FLUSH_IN : pipeline signal from csm

-- COMP_IN  : pipeline signal from csm

-- CLK : master clk

-- CLEAR : asyncronous clear

-- DOWN_PRIORITY_6_OUT

-- DOWN_PRIORITY_5_OUT 

-- DOWN_PRIORITY_4_OUT 

-- DOWN_PRIORITY_3_OUT 

-- DOWN_PRIORITY_2_OUT 

-- DOWN_PRIORITY_1_OUT 

-- MATCH_TYPE_A_OUT 

-- MATCH_TYPE_B_OUT 

-- MATCH_TYPE_C_OUT 

-- MATCH_TYPE_D_OUT 

-- SEARCH_STRING_OUT 

-- COLUMN_OR_OUT 

-- MASK_OUT

-- FLUSH_OUT 

-- COMP_OUT 

library IEEE;

use IEEE.std_logic_1164.all;

entity PIPELINE_R0 is

    port(

                DOWN_PRIORITY_6_IN : in bit_vector(15 downto 0);

                DOWN_PRIORITY_5_IN : in bit_vector(15 downto 0);

                DOWN_PRIORITY_4_IN : in bit_vector(15 downto 0);

                DOWN_PRIORITY_3_IN : in bit_vector(15 downto 0);

                DOWN_PRIORITY_2_IN : in bit_vector(15 downto 0);

                DOWN_PRIORITY_1_IN : in bit_vector(15 downto 0);

                SAME_LENGTH_IN_2 : in bit_vector(15 downto 0);

                SAME_LENGTH_IN_3 : in bit_vector(15 downto 0);

                SAME_LENGTH_IN_4 : in bit_vector(15 downto 0);

                MATCH_TYPE_A_IN : in bit_vector(15 downto 0);

                MATCH_TYPE_B_IN : in bit_vector(15 downto 0);

                MATCH_TYPE_C_IN : in bit_vector(15 downto 0);

                MATCH_TYPE_D_IN : in bit_vector(15 downto 0);

                SEARCH_STRING_IN : in bit_vector(31 downto 0);

                MASK_IN : in bit_vector(4 downto 0);

                COLUMN_OR_IN : in bit_vector(6 downto 1);

                FLUSH_IN : in bit;

                COMP_IN : in bit;

                MOVE_ENABLE_IN : in bit;

                INC_CAM_IN :  in bit;

        CLK : in bit;

                CLEAR : in bit;

                RESET : in bit;

                DOWN_PRIORITY_6_OUT : out bit_vector(15 downto 0);

                DOWN_PRIORITY_5_OUT : out bit_vector(15 downto 0);

                DOWN_PRIORITY_4_OUT : out bit_vector(15 downto 0);

                DOWN_PRIORITY_3_OUT : out bit_vector(15 downto 0);

                DOWN_PRIORITY_2_OUT : out bit_vector(15 downto 0);

                DOWN_PRIORITY_1_OUT : out bit_vector(15 downto 0);

                SAME_LENGTH_OUT_2 : out bit_vector(15 downto 0);

                SAME_LENGTH_OUT_3 : out bit_vector(15 downto 0);

                SAME_LENGTH_OUT_4 : out bit_vector(15 downto 0);

                MATCH_TYPE_A_OUT : out bit_vector(15 downto 0);

                MATCH_TYPE_B_OUT : out bit_vector(15 downto 0);

                MATCH_TYPE_C_OUT : out bit_vector(15 downto 0);

                MATCH_TYPE_D_OUT : out bit_vector(15 downto 0);

                SEARCH_STRING_OUT : out bit_vector(31 downto 0);

                MASK_OUT : out bit_vector(4 downto 0);

                COLUMN_OR_OUT : out bit_vector(6 downto 1);

                FLUSH_OUT : out bit;

                COMP_OUT : out bit;

                MOVE_ENABLE_OUT : out bit;

                INC_CAM_OUT : out bit

         );

end PIPELINE_R0;

architecture STRUCTURAL of PIPELINE_R0 is

signal DOWN_PRIORITY_6_OUT_aux : bit_vector(15 downto 0);

signal DOWN_PRIORITY_5_OUT_aux : bit_vector(15 downto 0);

signal DOWN_PRIORITY_4_OUT_aux : bit_vector(15 downto 0);

signal DOWN_PRIORITY_3_OUT_aux : bit_vector(15 downto 0);

signal DOWN_PRIORITY_2_OUT_aux : bit_vector(15 downto 0);

signal DOWN_PRIORITY_1_OUT_aux : bit_vector(15 downto 0);

signal SAME_LENGTH_2_OUT_aux : bit_vector(15 downto 0);

signal SAME_LENGTH_3_OUT_aux : bit_vector(15 downto 0);

signal SAME_LENGTH_4_OUT_aux : bit_vector(15 downto 0);

signal MATCH_TYPE_A_OUT_aux : bit_vector(15 downto 0);

signal MATCH_TYPE_B_OUT_aux : bit_vector(15 downto 0);

signal MATCH_TYPE_C_OUT_aux : bit_vector(15 downto 0);

signal MATCH_TYPE_D_OUT_aux : bit_vector(15 downto 0);

signal SEARCH_STRING_OUT_aux : bit_vector(31 downto 0);

signal MASK_OUT_aux : bit_vector(4 downto 0);

signal COLUMN_OR_OUT_aux : bit_vector(6 downto 1);

signal FLUSH_OUT_aux: bit;

signal COMP_OUT_aux: bit;

signal INC_CAM_OUT_aux:bit;

signal MOVE_ENABLE_OUT_aux: bit;

 begin

 process(CLK,CLEAR)

 begin

        if (CLEAR='0') then

                MASK_OUT_aux <= "00000";

                DOWN_PRIORITY_6_OUT_aux <=x"0000";

                DOWN_PRIORITY_5_OUT_aux <=x"0000";

                DOWN_PRIORITY_4_OUT_aux <=x"0000";

                DOWN_PRIORITY_3_OUT_aux <=x"0000";

                DOWN_PRIORITY_2_OUT_aux <=x"0000";

                DOWN_PRIORITY_1_OUT_aux <=x"0000";

                SAME_LENGTH_2_OUT_aux <= x"0000";

                SAME_LENGTH_3_OUT_aux <= x"0000";

                SAME_LENGTH_4_OUT_aux <= x"0000";

                MATCH_TYPE_A_OUT_aux <=x"FFFF";

                MATCH_TYPE_B_OUT_aux <=x"FFFF";

              MATCH_TYPE_C_OUT_aux <=x"FFFF";

              MATCH_TYPE_D_OUT_aux <=x"FFFF";

                SEARCH_STRING_OUT_aux <= x"00000000";

                COLUMN_OR_OUT_aux <= "000000";

                FLUSH_OUT_aux <= '1';

                COMP_OUT_aux <= '1';

                INC_CAM_OUT_aux<='0';

                MOVE_ENABLE_OUT_aux<='1';

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

                if (RESET='0') then

                        MASK_OUT_aux <= "00000";

                        DOWN_PRIORITY_6_OUT_aux <=x"0000";

                        DOWN_PRIORITY_5_OUT_aux <=x"0000";

                        DOWN_PRIORITY_4_OUT_aux <=x"0000";

                        DOWN_PRIORITY_3_OUT_aux <=x"0000";

                        DOWN_PRIORITY_2_OUT_aux <=x"0000";

                        DOWN_PRIORITY_1_OUT_aux <=x"0000";

                        SAME_LENGTH_2_OUT_aux <= x"0000";

                        SAME_LENGTH_3_OUT_aux <= x"0000";

                        SAME_LENGTH_4_OUT_aux <= x"0000";

                        MATCH_TYPE_A_OUT_aux <=x"FFFF";

                      MATCH_TYPE_B_OUT_aux <=x"FFFF";

                        MATCH_TYPE_C_OUT_aux <=x"FFFF";

                      MATCH_TYPE_D_OUT_aux <=x"FFFF";

                        SEARCH_STRING_OUT_aux <= x"00000000";

                        COLUMN_OR_OUT_aux <= "000000";

                        FLUSH_OUT_aux <= '1';

                        COMP_OUT_aux <= '1';

                        INC_CAM_OUT_aux<='0';

                        MOVE_ENABLE_OUT_aux<='1';

                 else

                        MASK_OUT_aux <= MASK_IN;

                        DOWN_PRIORITY_6_OUT_aux <= DOWN_PRIORITY_6_IN;

                        DOWN_PRIORITY_5_OUT_aux <= DOWN_PRIORITY_5_IN;

                        DOWN_PRIORITY_4_OUT_aux <= DOWN_PRIORITY_4_IN;

                        DOWN_PRIORITY_3_OUT_aux <= DOWN_PRIORITY_3_IN;

                        DOWN_PRIORITY_2_OUT_aux <= DOWN_PRIORITY_2_IN;

                        DOWN_PRIORITY_1_OUT_aux <= DOWN_PRIORITY_1_IN;

                        SAME_LENGTH_2_OUT_aux <= SAME_LENGTH_IN_2;

                        SAME_LENGTH_3_OUT_aux <= SAME_LENGTH_IN_3;

                        SAME_LENGTH_4_OUT_aux <= SAME_LENGTH_IN_4;

                        MATCH_TYPE_A_OUT_aux <= MATCH_TYPE_A_IN;

                        SEARCH_STRING_OUT_aux <= SEARCH_STRING_IN;

                        MATCH_TYPE_B_OUT_aux <= MATCH_TYPE_B_IN;

                      MATCH_TYPE_C_OUT_aux <= MATCH_TYPE_C_IN;

                      MATCH_TYPE_D_OUT_aux <= MATCH_TYPE_D_IN;

                        COLUMN_OR_OUT_aux <= COLUMN_OR_IN;

                        FLUSH_OUT_aux <= FLUSH_IN;

                        COMP_OUT_aux <= COMP_IN;

                        INC_CAM_OUT_aux<=INC_CAM_IN;

                        MOVE_ENABLE_OUT_aux<=MOVE_ENABLE_IN;

          end if;

        end if;

 end process;

 MASK_OUT <= MASK_OUT_aux;

 DOWN_PRIORITY_6_OUT <= DOWN_PRIORITY_6_OUT_aux;

 DOWN_PRIORITY_5_OUT <= DOWN_PRIORITY_5_OUT_aux;

 DOWN_PRIORITY_4_OUT <= DOWN_PRIORITY_4_OUT_aux;

 DOWN_PRIORITY_3_OUT <= DOWN_PRIORITY_3_OUT_aux;

 DOWN_PRIORITY_2_OUT <= DOWN_PRIORITY_2_OUT_aux;

 DOWN_PRIORITY_1_OUT <= DOWN_PRIORITY_1_OUT_aux;

 SAME_LENGTH_OUT_2 <= SAME_LENGTH_2_OUT_aux;

 SAME_LENGTH_OUT_3 <= SAME_LENGTH_3_OUT_aux;

 SAME_LENGTH_OUT_4 <= SAME_LENGTH_4_OUT_aux;

 MATCH_TYPE_A_OUT <= MATCH_TYPE_A_OUT_aux;

 MATCH_TYPE_B_OUT <= MATCH_TYPE_B_OUT_aux;

 MATCH_TYPE_C_OUT <= MATCH_TYPE_C_OUT_aux;

 MATCH_TYPE_D_OUT <= MATCH_TYPE_D_OUT_aux;

 COLUMN_OR_OUT <= COLUMN_OR_OUT_aux;

 FLUSH_OUT <= FLUSH_OUT_aux;

 COMP_OUT <= COMP_OUT_aux;

 SEARCH_STRING_OUT <= SEARCH_STRING_OUT_aux;

 INC_CAM_OUT <= INC_CAM_OUT_aux;

 MOVE_ENABLE_OUT<=MOVE_ENABLE_OUT_aux;

-- DOWN_PRIORITY_5_OUT <= DOWN_PRIORITY_5_IN;

-- DOWN_PRIORITY_4_OUT <= DOWN_PRIORITY_4_IN;

-- DOWN_PRIORITY_3_OUT <= DOWN_PRIORITY_3_IN;

-- DOWN_PRIORITY_2_OUT <= DOWN_PRIORITY_2_IN;

-- DOWN_PRIORITY_1_OUT <= DOWN_PRIORITY_1_IN;

-- MATCH_TYPE_A_OUT <= MATCH_TYPE_A_IN;

-- MATCH_TYPE_B_OUT <= MATCH_TYPE_B_IN;

-- MATCH_TYPE_C_OUT <= MATCH_TYPE_C_IN;

-- MATCH_TYPE_D_OUT <= MATCH_TYPE_D_IN;

-- COLUMN_OR_OUT <= COLUMN_OR_IN; 

-- FLUSH_OUT <= FLUSH_IN;

-- COMP_OUT <= COMP_IN;

-- SEARCH_STRING_OUT <= SEARCH_STRING_IN;

end structural;