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       = CAM_BYTE    --

--  version      = 1.0         --

--  last update  = 14/06/98    --

--  author       = Jose Nunez  --

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

-- FUNCTION

-- single byte CAM element

--  PIN LIST

--  SEARCH   = input search data byte

--  PREVIOUS = data from the previous location in the array

--  CLEAR    = asynchronous clear of the data latches (active LOW)

--  CLK      = master clock

--  DOUT     = output of the data latches

--  MATCH    = indicates a match between search byte and data byte (active LOW)

library ieee;

use ieee.std_logic_1164.all;

entity CAM_BYTE_FIRST is

port

(

        SEARCH : in bit_vector(7 downto 0);

        PREVIOUS : in bit_vector(7 downto 0);

        CLEAR : in bit ;

        RESET: in bit;

        CLK : in bit ;

        DOUT : out bit_vector(7 downto 0);

        MATCH : out bit

);

end CAM_BYTE_FIRST;

architecture BYTE1 of CAM_BYTE_FIRST is

component CAM_BIT_FIRST

port

(

        SEARCH : in bit;

        PREVIOUS : in bit;

        CLEAR : in bit ;

        RESET: in bit;

        CLK : in bit ;

        DOUT : out bit;

        MATCH : out bit

);

end component;

signal MATCH_BITS : bit_vector(7 downto 0);

begin

GEN_BYTE : for I in 0 to 7 generate

    BIT : CAM_BIT_FIRST port map (SEARCH => SEARCH(I),

                            PREVIOUS => PREVIOUS(I),

                            CLEAR => CLEAR,

                                RESET=>RESET,

                            CLK => CLK,

                            DOUT => DOUT(I),

                            MATCH => MATCH_BITS(I));

end generate;

MATCH <= MATCH_BITS(7) or MATCH_BITS(6) or

         MATCH_BITS(5) or MATCH_BITS(4) or

         MATCH_BITS(3) or MATCH_BITS(2) or

         MATCH_BITS(1) or MATCH_BITS(0);

end BYTE1;