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       = CM_ASSEMBLER  --

--  version      = 1.0           --

--  last update  = 16/06/99      --

--  author       = Jose Nunez    --

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

-- FUNCTION

-- assembles the match location code and match type code into a single word

-- PIN LIST

-- CODE_A     = match location code (left justified)

-- MISS       = detects a possible miss

-- CODE_B     = match type code (left justified)

-- LENGTH_B   = match type code length

-- CODE_OUT   = assembled output code

-- LENGTH_OUT = output code length

library ieee,dzx;

use ieee.std_logic_1164.all;

use dzx.bit_arith.all;

use dzx.attributes.all;

entity CM_ASSEMBLER is

port

(

        CODE_A : in bit_vector(4 downto 0);

        LENGTH_A : in bit_vector(2 downto 0);

        MISS: in bit;

      CODE_B : in bit_vector(5 downto 0);

      LENGTH_B : in bit_vector(2 downto 0);

        CODE_OUT : out bit_vector(10 downto 0);

        LENGTH_OUT : out bit_vector(3 downto 0)

);

end CM_ASSEMBLER;

architecture NOSHIFTER of CM_ASSEMBLER is

begin

ASSEMBLE : process(CODE_A , LENGTH_A , CODE_B)

begin

case LENGTH_A is

when "001" => CODE_OUT <= CODE_A(4) & CODE_B & "0000";

when "010" => CODE_OUT <= CODE_A(4 downto 3) & CODE_B & "000";

when "011" => CODE_OUT <= CODE_A(4 downto 2) & CODE_B & "00";

when "100" => CODE_OUT <= CODE_A(4 downto 1) & CODE_B & "0";

when "101" => CODE_OUT <= CODE_A(4 downto 0) & CODE_B;

when others => CODE_OUT <= "00000000000";

end case;

end process ASSEMBLE;

LENGTH_OUT <= ('0' & LENGTH_A) + ('0' & LENGTH_B) when MISS = '0' else "0001";

end NOSHIFTER; -- end of architecture