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;