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       = MLD_DECODE  --

--  version      = 1.0         --

--  last update  = 20/04/01    --

--  author       = Jose Nunez  --

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

-- FUNCTION

-- Decodes incoming match type into a pre-determined priority.

-- PIN LIST

-- M_TYPE   = input match type.

-- PRIORITY = output priority.

library ieee,dzx;

use ieee.std_logic_1164.all;

entity MLD_DECODE is

port

        (

        M_TYPE : in bit_vector(3 downto 0);

        PRIORITY : out bit_vector(5 downto 0)

        );

end MLD_DECODE;

architecture DEC of MLD_DECODE is

begin

DECODE : process (M_TYPE)

begin

case M_TYPE is

        -- priority 6

        when "0000" => PRIORITY <= "100000";

        -- priority 5

        when "0001" => PRIORITY <= "010000";

        -- priority 4

        when "1000" => PRIORITY <= "001000";

        -- priority 3

        when "0010" | "0100" => PRIORITY <= "000100";

        -- priority 2

        when "0011" => PRIORITY <= "000010";

        -- priority 1

        when "1001" | "1100" => PRIORITY <= "000001";

        -- anything else is priority 0

        when others => PRIORITY <= "000000";

end case;

end process DECODE;

end DEC; -- end of architecture