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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 = CML_ASSEMBLER --
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-- version = 1.0 --
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-- last update = 9/09/99 --
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-- author = Jose Nunez --
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-----------------------------------
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-- FUNCTION
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-- assembles the match location / match type codes and literal characters into a single word
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-- PIN LIST
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-- CODE_A = match location/type code (left justified)
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-- LENGTH_A = match location/type code length
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-- CODE_B = literal characters (left justified)
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-- LENGTH_B = length of literal characters
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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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entity CML_ASSEMBLER is
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port
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(
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CODE_A : in bit_vector(10 downto 0);
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LENGTH_A : in bit_vector(3 downto 0);
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CODE_B : in bit_vector(33 downto 0);
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LENGTH_B : in bit_vector(5 downto 0);
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CODE_OUT : out bit_vector(34 downto 0);
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LENGTH_OUT : out bit_vector(5 downto 0)
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);
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end CML_ASSEMBLER;
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architecture SHIFTER of CML_ASSEMBLER is
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begin
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SHIFT : process ( CODE_A , CODE_B , LENGTH_A )
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begin
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case LENGTH_A is
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when "0000" => CODE_OUT <= CODE_B & '0';
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when "0001" => CODE_OUT <= CODE_A(10) & CODE_B;
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when "0010" => CODE_OUT <= CODE_A(10 downto 9) & CODE_B(33 downto 1);
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when "0011" => CODE_OUT <= CODE_A(10 downto 8) & CODE_B(33 downto 2);
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when "0100" => CODE_OUT <= CODE_A(10 downto 7) & CODE_B(33 downto 3);
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when "0101" => CODE_OUT <= CODE_A(10 downto 6) & CODE_B(33 downto 4);
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when "0110" => CODE_OUT <= CODE_A(10 downto 5) & CODE_B(33 downto 5);
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when "0111" => CODE_OUT <= CODE_A(10 downto 4) & CODE_B(33 downto 6);
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when "1000" => CODE_OUT <= CODE_A(10 downto 3) & CODE_B(33 downto 7);
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when "1001" => CODE_OUT <= CODE_A(10 downto 2) & CODE_B(33 downto 8);
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when "1010" => CODE_OUT <= CODE_A(10 downto 1) & CODE_B(33 downto 9);
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when "1011" => CODE_OUT <= CODE_A & CODE_B(33 downto 10);
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when others => CODE_OUT <= "00000000000000000000000000000000000";
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end case;
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end process SHIFT;
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LENGTH_OUT <= ("00" & LENGTH_A) + LENGTH_B;
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end SHIFTER; -- end of architecture
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