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--This library is free software; you can redistribute it and/or
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--modify it under the terms of the GNU Lesser General Public
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--License as published by the Free Software Foundation; either
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--version 2.1 of the License, or (at your option) any later version.
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--This library is distributed in the hope that it will be useful,
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--but WITHOUT ANY WARRANTY; without even the implied warranty of
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--MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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--Lesser General Public License for more details.
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--You should have received a copy of the GNU Lesser General Public
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--License along with this library; if not, write to the Free Software
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--Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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-- e_mail : j.l.nunez-yanez@byacom.co.uk
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---------------------------------
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-- ENTITY = OB_ASSEM --
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-- version = 1.0 --
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-- last update = 19/05/98 --
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-- author = Jose Nunez --
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---------------------------------
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-- FUNCTION
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-- Assembles output tuples according to the 4 bit MATCH_TYPE
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-- If bit N of MATCH_TYPE is LOW then byte A of CAM_DATA is
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-- valid and should be output to byte A of DOUT, otherwise
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-- byte A of LITERAL_DATA should be output to DOUT.
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-- This is effectively 4 X (8 X 2-to-1 MUX).
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-- PIN LIST
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-- CAM_DATA = 32 bit data from the CAM array
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-- LITERAL_DATA = 32 bits of literal data
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-- MATCH_TYPE = 4 bit bus to indicate which BYTES of
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-- CAM_DATA are valid
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-- DOUT = output of 32 bits of valid data
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library ieee,dzx;
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use ieee.std_logic_1164.all;
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use dzx.attributes.all;
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entity OB_ASSEM is
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port
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(
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RAM_DATA : in std_logic_vector(31 downto 0) ;
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RAM_MASK : in std_logic_vector(3 downto 0);
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LITERAL_DATA : in bit_vector(31 downto 0);
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LITERAL_MASK : in bit_vector(4 downto 0);
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MATCH_TYPE : in bit_vector(3 downto 0) ;
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MOUT : out bit_vector(3 downto 0);
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DOUT : out bit_vector(31 downto 0)
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);
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end OB_ASSEM;
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architecture ASSEMBLE of OB_ASSEM is
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signal CAM_DATA : bit_vector(31 downto 0);
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signal MISS_DATA : bit_vector(31 downto 0);
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begin
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CAM_DATA <= To_bitvector(RAM_DATA);
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MISS_ASSEMBLE : process(LITERAL_MASK, LITERAL_DATA)
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begin
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case LITERAL_MASK is
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when "10000" => MISS_DATA <= x"20000000";
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when "11000" => MISS_DATA <= LITERAL_DATA(31 downto 24) & x"200000";
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when "11100" => MISS_DATA <= LITERAL_DATA(31 downto 24) & LITERAL_DATA(23 downto 16) & x"2000";
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when "11110" => MISS_DATA <= LITERAL_DATA(31 downto 24) & LITERAL_DATA(23 downto 16) & LITERAL_DATA(15 downto 8) & x"20";
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when "11111" => MISS_DATA <= LITERAL_DATA(31 downto 24) & LITERAL_DATA(23 downto 16) & LITERAL_DATA(15 downto 8) & LITERAL_DATA(7 downto 0);
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when others => MISS_DATA <= x"00000000";
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end case;
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end process MISS_ASSEMBLE;
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DECIDE : process (CAM_DATA , RAM_MASK, LITERAL_DATA , MATCH_TYPE, MISS_DATA, LITERAL_MASK)
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begin
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case MATCH_TYPE is
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when "0000" => DOUT(31 downto 24) <= CAM_DATA(31 downto 24);
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DOUT(23 downto 16) <= CAM_DATA(23 downto 16);
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DOUT(15 downto 8) <= CAM_DATA(15 downto 8);
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DOUT(7 downto 0) <= CAM_DATA(7 downto 0);
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MOUT <= To_bitvector(RAM_MASK);
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when "0001" => DOUT(31 downto 24) <= CAM_DATA(31 downto 24);
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DOUT(23 downto 16) <= CAM_DATA(23 downto 16);
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DOUT(15 downto 8) <= CAM_DATA(15 downto 8);
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DOUT(7 downto 0) <= LITERAL_DATA(31 downto 24);
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MOUT <= "1111";
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when "0010" => DOUT(31 downto 24) <= CAM_DATA(31 downto 24);
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DOUT(23 downto 16) <= CAM_DATA(23 downto 16);
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DOUT(15 downto 8) <= LITERAL_DATA(31 downto 24);
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DOUT(7 downto 0) <= CAM_DATA(7 downto 0);
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MOUT <= "1111";
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when "0011" => DOUT(31 downto 24) <= CAM_DATA(31 downto 24);
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DOUT(23 downto 16) <= CAM_DATA(23 downto 16);
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DOUT(15 downto 8) <= LITERAL_DATA(31 downto 24);
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DOUT(7 downto 0) <= LITERAL_DATA(23 downto 16);
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MOUT <= "1111";
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when "0100" => DOUT(31 downto 24) <= CAM_DATA(31 downto 24);
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DOUT(23 downto 16) <= LITERAL_DATA(31 downto 24);
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DOUT(15 downto 8) <= CAM_DATA(15 downto 8);
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DOUT(7 downto 0) <= CAM_DATA(7 downto 0);
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MOUT <= "1111";
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when "0110" => DOUT(31 downto 24) <= CAM_DATA(31 downto 24);
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DOUT(23 downto 16) <= LITERAL_DATA(31 downto 24);
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DOUT(15 downto 8) <= LITERAL_DATA(23 downto 16);
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DOUT(7 downto 0) <= CAM_DATA(7 downto 0);
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MOUT <= "1111";
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when "1000" => DOUT(31 downto 24) <= LITERAL_DATA(31 downto 24);
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DOUT(23 downto 16) <= CAM_DATA(23 downto 16);
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DOUT(15 downto 8) <= CAM_DATA(15 downto 8);
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DOUT(7 downto 0) <= CAM_DATA(7 downto 0);
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MOUT <= "1111";
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when "1001" => DOUT(31 downto 24) <= LITERAL_DATA(31 downto 24);
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DOUT(23 downto 16) <= CAM_DATA(23 downto 16);
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DOUT(15 downto 8) <= CAM_DATA(15 downto 8);
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DOUT(7 downto 0) <= LITERAL_DATA(23 downto 16);
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MOUT <= "1111";
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when "1100" => DOUT(31 downto 24) <= LITERAL_DATA(31 downto 24);
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DOUT(23 downto 16) <= LITERAL_DATA(23 downto 16);
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DOUT(15 downto 8) <= CAM_DATA(15 downto 8);
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DOUT(7 downto 0) <= CAM_DATA(7 downto 0);
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MOUT <= "1111";
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when "1111" => DOUT(31 downto 24) <= MISS_DATA(31 downto 24);
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DOUT(23 downto 16) <= MISS_DATA(23 downto 16);
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DOUT(15 downto 8) <= MISS_DATA(15 downto 8);
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DOUT(7 downto 0) <= MISS_DATA(7 downto 0);
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MOUT <= LITERAL_MASK(4 downto 1);
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when others => DOUT(31 downto 24) <= "00000000";
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DOUT(23 downto 16) <= "00000000";
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DOUT(15 downto 8) <= "00000000";
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DOUT(7 downto 0) <= "00000000";
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MOUT <= "0000";
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end case;
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end process DECIDE;
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end ASSEMBLE;
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