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[/] [xmatchpro/] [trunk/] [xmw4-comdec/] [src/] [cm_assembler.vhd] - Blame information for rev 8

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1 8 eejlny
--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       = CM_ASSEMBLER  --
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--  version      = 1.0           --
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--  last update  = 16/06/99      --
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--  author       = Jose Nunez    --
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-----------------------------------
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-- FUNCTION
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-- assembles the match location code and match type code into a single word
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-- PIN LIST
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-- CODE_A     = match location code (left justified)
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-- MISS       = detects a possible miss
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-- CODE_B     = match type code (left justified)
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-- LENGTH_B   = match type code length
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-- CODE_OUT   = assembled output code
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-- LENGTH_OUT = output code length
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library ieee,dzx;
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use ieee.std_logic_1164.all;
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use dzx.bit_arith.all;
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use dzx.attributes.all;
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entity CM_ASSEMBLER is
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port
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(
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        CODE_A : in bit_vector(4 downto 0);
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        LENGTH_A : in bit_vector(2 downto 0);
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        MISS: in bit;
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      CODE_B : in bit_vector(5 downto 0);
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      LENGTH_B : in bit_vector(2 downto 0);
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        CODE_OUT : out bit_vector(10 downto 0);
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        LENGTH_OUT : out bit_vector(3 downto 0)
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);
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end CM_ASSEMBLER;
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architecture NOSHIFTER of CM_ASSEMBLER is
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begin
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ASSEMBLE : process(CODE_A , LENGTH_A , CODE_B)
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begin
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case LENGTH_A is
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when "001" => CODE_OUT <= CODE_A(4) & CODE_B & "0000";
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when "010" => CODE_OUT <= CODE_A(4 downto 3) & CODE_B & "000";
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when "011" => CODE_OUT <= CODE_A(4 downto 2) & CODE_B & "00";
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when "100" => CODE_OUT <= CODE_A(4 downto 1) & CODE_B & "0";
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when "101" => CODE_OUT <= CODE_A(4 downto 0) & CODE_B;
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when others => CODE_OUT <= "00000000000";
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end case;
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end process ASSEMBLE;
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LENGTH_OUT <= ('0' & LENGTH_A) + ('0' & LENGTH_B) when MISS = '0' else "0001";
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end NOSHIFTER; -- end of architecture
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