Subversion Repositories cpu65c02_true_cycle

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 ;

-- (C) 2008 - 2021 Jens Gutschmidt

-- (email: opencores@vivare-services.com)

-- 

-- Versions:

-- Revision 1.7  2013/07/21 11:11:00  jens

-- - Changing the title block and internal revision history

-- 

-- Revision 1.6  2009/01/04 10:20:47  eda

-- Changes for cosmetic issues only

-- 

-- Revision 1.5  2009/01/04 09:23:10  eda

-- - Delete unused nets and blocks (same as R6502_TC)

-- - Rename blocks

-- 

-- Revision 1.4  2009/01/03 16:53:02  eda

-- - Unused nets and blocks deleted

-- - Renamed blocks

-- 

-- Revision 1.3  2009/01/03 16:42:02  eda

-- - Unused nets and blocks deleted

-- - Renamed blocks

-- 

-- Revision 1.2  2008/12/31 19:31:24  eda

-- Production Release

--  

-- 

--

-- r65c02_tc.regbank_axy.struct

--

-- Date:    06.01.2021

-- Time:    22:58:44

-- By:        VIVARE GmbH, Switzerland

--

-- COPYRIGHT (C) 2008 - 2021 by Jens Gutschmidt

-- 

-- 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/>.

-- 

-- 

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(v1.12) for instance 'U_0' of 'adff'

   signal mw_U_0reg_cval : std_logic_vector(7 downto 0);

   -- ModuleWare signal declarations(v1.12) for instance 'U_4' of 'adff'

   signal mw_U_4reg_cval : std_logic_vector(7 downto 0);

   -- ModuleWare signal declarations(v1.12) for instance 'U_5' of 'adff'

   signal mw_U_5reg_cval : std_logic_vector(7 downto 0);

begin

   -- ModuleWare code(v1.12) 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') then

         mw_U_0reg_cval <= "00000000";

      elsif (clk_clk_i'event and clk_clk_i='1') then

         if (load_o_i = '1') then

            mw_U_0reg_cval <= q_mux_o_i;

         end if;

      end if;

   end process u_0seq_proc;

   -- ModuleWare code(v1.12) 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') then

         mw_U_4reg_cval <= "00000000";

      elsif (clk_clk_i'event and clk_clk_i='1') then

         if (load1_o_i = '1') then

            mw_U_4reg_cval <= q_mux_o_i;

         end if;

      end if;

   end process u_4seq_proc;

   -- ModuleWare code(v1.12) 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') then

         mw_U_5reg_cval <= "00000000";

      elsif (clk_clk_i'event and clk_clk_i='1') then

         if (load2_o_i = '1') then

            mw_U_5reg_cval <= q_mux_o_i;

         end if;

      end if;

   end process u_5seq_proc;

   -- ModuleWare code(v1.12) for instance 'U_6' of 'and'

   load_o_i <= load_regs_i and ld(0);

   -- ModuleWare code(v1.12) for instance 'U_7' of 'and'

   load1_o_i <= load_regs_i and ld(1);

   -- ModuleWare code(v1.12) for instance 'U_8' of 'and'

   load2_o_i <= load_regs_i and ld(2);

   -- ModuleWare code(v1.12) for instance 'U_11' of 'constval'

   val_zero <= "00000000";

   -- ModuleWare code(v1.12) 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(v1.12) 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" => d_regs_out_o <= q_a_o_internal;

      when "01" => d_regs_out_o <= q_x_o_internal;

      when "10" => d_regs_out_o <= q_y_o_internal;

      when "11" => d_regs_out_o <= val_zero;

      when others => d_regs_out_o <= (others => 'X');

      end case;

   end process u_2combo_proc;

   -- ModuleWare code(v1.12) 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" => q_mux_o_i <= q_a_o_internal;

      when "01" => q_mux_o_i <= q_y_o_internal;

      when "10" => q_mux_o_i <= q_x_o_internal;

      when "11" => 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;