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-- VHDL Entity R6502_TC.RegBank_AXY.symbol
--
-- Created:
--          by - eda.UNKNOWN (TEST)
--          at - 18:23:46 07.01.2009
--
-- Generated by Mentor Graphics' HDL Designer(TM) 2007.1a (Build 13)
--
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
 
ENTITY RegBank_AXY IS
   PORT( 
      clk_clk_i    : IN     std_logic;
      d_regs_in_i  : IN     std_logic_vector (7 DOWNTO 0);
      load_regs_i  : IN     std_logic;
      rst_rst_n_i  : IN     std_logic;
      sel_rb_in_i  : IN     std_logic_vector (1 DOWNTO 0);
      sel_rb_out_i : IN     std_logic_vector (1 DOWNTO 0);
      sel_reg_i    : IN     std_logic_vector (1 DOWNTO 0);
      d_regs_out_o : OUT    std_logic_vector (7 DOWNTO 0);
      q_a_o        : OUT    std_logic_vector (7 DOWNTO 0);
      q_x_o        : OUT    std_logic_vector (7 DOWNTO 0);
      q_y_o        : OUT    std_logic_vector (7 DOWNTO 0)
   );
 
-- Declarations
 
END RegBank_AXY ;
 
-- Jens-D. Gutschmidt     Project:  R6502_TC  
-- scantara2003@yahoo.de                      
-- COPYRIGHT (C) 2008 by Jens Gutschmidt and OPENCORES.ORG                                                                                     
--                                                                                                                                             
-- This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by   
-- the Free Software Foundation, either version 3 of the License, or any later version.                                                        
--                                                                                                                                             
-- This program 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 General Public License for more details.                                  
--                                                                                                                                             
-- You should have received a copy of the GNU General Public License along with this program.  If not, see <http://www.gnu.org/licenses/>.     
--                                                                                                                                             
-- CVS Revisins History                                                                                                                        
--                                                                                                                                             
-- $Log: not supported by cvs2svn $                                                                                                                         
--   <<-- more -->>                                                                                                                            
-- Title:  Register Bank for register A, X and Y  
-- Path:  R6502_TC/RegBank_AXY/struct  
-- Edited:  by eda on 02 Jan 2009  
--
-- VHDL Architecture R6502_TC.RegBank_AXY.struct
--
-- Created:
--          by - eda.UNKNOWN (TEST)
--          at - 18:23:46 07.01.2009
--
-- Generated by Mentor Graphics' HDL Designer(TM) 2007.1a (Build 13)
--
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
 
 
ARCHITECTURE struct OF RegBank_AXY IS
 
   -- Architecture declarations
 
   -- Internal signal declarations
   SIGNAL ld        : std_logic_vector(2 DOWNTO 0);
   SIGNAL load1_o_i : std_logic;
   SIGNAL load2_o_i : std_logic;
   SIGNAL load_o_i  : std_logic;
   SIGNAL q_mux_o_i : std_logic_vector(7 DOWNTO 0);
   SIGNAL val_zero  : std_logic_vector(7 DOWNTO 0);
 
   -- Implicit buffer signal declarations
   SIGNAL q_a_o_internal : std_logic_vector (7 DOWNTO 0);
   SIGNAL q_x_o_internal : std_logic_vector (7 DOWNTO 0);
   SIGNAL q_y_o_internal : std_logic_vector (7 DOWNTO 0);
 
 
   -- ModuleWare signal declarations(v1.9) for instance 'U_0' of 'adff'
   SIGNAL mw_U_0reg_cval : std_logic_vector(7 DOWNTO 0);
 
   -- ModuleWare signal declarations(v1.9) for instance 'U_4' of 'adff'
   SIGNAL mw_U_4reg_cval : std_logic_vector(7 DOWNTO 0);
 
   -- ModuleWare signal declarations(v1.9) for instance 'U_5' of 'adff'
   SIGNAL mw_U_5reg_cval : std_logic_vector(7 DOWNTO 0);
 
 
BEGIN
 
   -- ModuleWare code(v1.9) for instance 'U_0' of 'adff'
   q_a_o_internal <= mw_U_0reg_cval;
   u_0seq_proc: PROCESS (clk_clk_i, rst_rst_n_i)
   BEGIN
      IF (rst_rst_n_i = '0' OR rst_rst_n_i = 'L') THEN
         mw_U_0reg_cval <= "00000000";
      ELSIF (clk_clk_i'EVENT AND clk_clk_i='1') THEN
         IF (load_o_i = '1' OR load_o_i = 'H') THEN
            mw_U_0reg_cval <= q_mux_o_i;
         END IF;
      END IF;
   END PROCESS u_0seq_proc;
 
   -- ModuleWare code(v1.9) for instance 'U_4' of 'adff'
   q_x_o_internal <= mw_U_4reg_cval;
   u_4seq_proc: PROCESS (clk_clk_i, rst_rst_n_i)
   BEGIN
      IF (rst_rst_n_i = '0' OR rst_rst_n_i = 'L') THEN
         mw_U_4reg_cval <= "00000000";
      ELSIF (clk_clk_i'EVENT AND clk_clk_i='1') THEN
         IF (load1_o_i = '1' OR load1_o_i = 'H') THEN
            mw_U_4reg_cval <= q_mux_o_i;
         END IF;
      END IF;
   END PROCESS u_4seq_proc;
 
   -- ModuleWare code(v1.9) for instance 'U_5' of 'adff'
   q_y_o_internal <= mw_U_5reg_cval;
   u_5seq_proc: PROCESS (clk_clk_i, rst_rst_n_i)
   BEGIN
      IF (rst_rst_n_i = '0' OR rst_rst_n_i = 'L') THEN
         mw_U_5reg_cval <= "00000000";
      ELSIF (clk_clk_i'EVENT AND clk_clk_i='1') THEN
         IF (load2_o_i = '1' OR load2_o_i = 'H') THEN
            mw_U_5reg_cval <= q_mux_o_i;
         END IF;
      END IF;
   END PROCESS u_5seq_proc;
 
   -- ModuleWare code(v1.9) for instance 'U_6' of 'and'
   load_o_i <= load_regs_i AND ld(0);
 
   -- ModuleWare code(v1.9) for instance 'U_7' of 'and'
   load1_o_i <= load_regs_i AND ld(1);
 
   -- ModuleWare code(v1.9) for instance 'U_8' of 'and'
   load2_o_i <= load_regs_i AND ld(2);
 
   -- ModuleWare code(v1.9) for instance 'U_11' of 'constval'
   val_zero <= "00000000";
 
   -- ModuleWare code(v1.9) for instance 'U_1' of 'decoder1'
   u_1combo_proc: PROCESS (sel_reg_i)
   BEGIN
      ld <= (OTHERS => '0');
      CASE sel_reg_i IS
         WHEN "00" => ld(0) <= '1';
         WHEN "01" => ld(1) <= '1';
         WHEN "10" => ld(2) <= '1';
         WHEN OTHERS => ld <= (OTHERS => '0');
      END CASE;
   END PROCESS u_1combo_proc;
 
   -- ModuleWare code(v1.9) for instance 'U_2' of 'mux'
   u_2combo_proc: PROCESS(q_a_o_internal, q_x_o_internal, q_y_o_internal, 
                          val_zero, sel_rb_out_i)
   BEGIN
      CASE sel_rb_out_i IS
      WHEN "00"|"L0"|"0L"|"LL" => d_regs_out_o <= q_a_o_internal;
      WHEN "01"|"L1"|"0H"|"LH" => d_regs_out_o <= q_x_o_internal;
      WHEN "10"|"H0"|"1L"|"HL" => d_regs_out_o <= q_y_o_internal;
      WHEN "11"|"H1"|"1H"|"HH" => d_regs_out_o <= val_zero;
      WHEN OTHERS => d_regs_out_o <= (OTHERS => 'X');
      END CASE;
   END PROCESS u_2combo_proc;
 
   -- ModuleWare code(v1.9) for instance 'U_3' of 'mux'
   u_3combo_proc: PROCESS(q_a_o_internal, q_y_o_internal, q_x_o_internal, 
                          d_regs_in_i, sel_rb_in_i)
   BEGIN
      CASE sel_rb_in_i IS
      WHEN "00"|"L0"|"0L"|"LL" => q_mux_o_i <= q_a_o_internal;
      WHEN "01"|"L1"|"0H"|"LH" => q_mux_o_i <= q_y_o_internal;
      WHEN "10"|"H0"|"1L"|"HL" => q_mux_o_i <= q_x_o_internal;
      WHEN "11"|"H1"|"1H"|"HH" => q_mux_o_i <= d_regs_in_i;
      WHEN OTHERS => q_mux_o_i <= (OTHERS => 'X');
      END CASE;
   END PROCESS u_3combo_proc;
 
   -- Instance port mappings.
 
   -- Implicit buffered output assignments
   q_a_o <= q_a_o_internal;
   q_x_o <= q_x_o_internal;
   q_y_o <= q_y_o_internal;
 
END struct;