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[/] [xmatchpro/] [trunk/] [xmw4-comdec/] [src/] [cam_byte.vhd] - Rev 9
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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 = 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 -- MOVE = movement control -- CLEAR = synchronous 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 is port ( SEARCH : in bit_vector(7 downto 0); PREVIOUS : in bit_vector(7 downto 0); MOVE : in bit; CLEAR : in bit ; RESET : in bit; CLK : in bit ; DOUT : out bit_vector(7 downto 0); MATCH : out bit ); end CAM_BYTE; ----------------------------------- -- entity = CAM_BYTE -- -- ARCHITECTURE = BIT1 -- -- version = 1.0 -- -- last update = 14/06/95 -- -- author = Mark Gooch -- ----------------------------------- architecture BYTE1 of CAM_BYTE is component CAM_BIT port ( SEARCH : in bit; PREVIOUS : in bit; MOVE : 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 port map (SEARCH => SEARCH(I), PREVIOUS => PREVIOUS(I), MOVE => MOVE, 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;
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