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[/] [xmatchpro/] [trunk/] [xmw4-comdec/] [src/] [encode16_4.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 = ENCODE16_4 -- -- version = 2.0 -- -- last update = 16/06/98 -- -- author = Jose Nunez -- --------------------------------- -- FUNCTION -- 16 to 4 encoder to convert active low 16 bit maatch bus input -- to a 4 bit wide binary code. -- PIN LIST -- MATCH_LOC_IN = 16 bit match location input bus (active low) -- MATCH_LOC_OUT = 4 bit binary output match location bus -- MISS = active low signal to indicate that a miss has occurred library ieee,dzx; use ieee.std_logic_1164.all; entity ENCODE16_4 is port ( MATCH_LOC_IN : in bit_vector(15 downto 0); MATCH_LOC_OUT : out bit_vector(3 downto 0) ); end ENCODE16_4; architecture ENC2 of ENCODE16_4 is begin ENCODER : process (MATCH_LOC_IN) begin case MATCH_LOC_IN is when x"FFFE" => MATCH_LOC_OUT <= "0000"; when x"FFFD" => MATCH_LOC_OUT <= "0001"; when x"FFFB" => MATCH_LOC_OUT <= "0010"; when x"FFF7" => MATCH_LOC_OUT <= "0011"; when x"FFEF" => MATCH_LOC_OUT <= "0100"; when x"FFDF" => MATCH_LOC_OUT <= "0101"; when x"FFBF" => MATCH_LOC_OUT <= "0110"; when x"FF7F" => MATCH_LOC_OUT <= "0111"; when x"FEFF" => MATCH_LOC_OUT <= "1000"; when x"FDFF" => MATCH_LOC_OUT <= "1001"; when x"FBFF" => MATCH_LOC_OUT <= "1010"; when x"F7FF" => MATCH_LOC_OUT <= "1011"; when x"EFFF" => MATCH_LOC_OUT <= "1100"; when x"DFFF" => MATCH_LOC_OUT <= "1101"; when x"BFFF" => MATCH_LOC_OUT <= "1110"; when x"7FFF" => MATCH_LOC_OUT <= "1111"; when x"FFFF" => MATCH_LOC_OUT <= "1111"; when others => MATCH_LOC_OUT <= "1111"; -- when others => null; end case; end process ENCODER; end ENC2; -- end of architecture
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