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-- VHDL Entity R6502_TC.Core.symbol

--

-- Created:

--          by - eda.UNKNOWN (ENTWICKL4-XP-PR)

--          at - 22:53:21 04.01.2009

--

-- 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 Core is

   port(

      clk_clk_i   : in     std_logic;

      d_i         : in     std_logic_vector (7 downto 0);

      irq_n_i     : in     std_logic;

      nmi_n_i     : in     std_logic;

      rdy_i       : in     std_logic;

      rst_rst_n_i : in     std_logic;

      so_n_i      : in     std_logic;

      a_o         : out    std_logic_vector (15 downto 0);

      d_o         : out    std_logic_vector (7 downto 0);

      rd_o        : out    std_logic;

      sync_o      : out    std_logic;

      wr_n_o      : out    std_logic;

      wr_o        : out    std_logic

   );

-- Declarations

end Core ;

-- 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:  Core  

-- Path:  R6502_TC/Core/struct  

-- Edited:  by eda on 04 Jan 2009  

--

-- VHDL Architecture R6502_TC.Core.struct

--

-- Created:

--          by - eda.UNKNOWN (ENTWICKL4-XP-PR)

--          at - 22:53:22 04.01.2009

--

-- 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;

library R6502_TC;

architecture struct of Core is

   -- Architecture declarations

   -- Internal signal declarations

   signal adr_nxt_pc_o_i : std_logic_vector(15 downto 0);

   signal adr_o_i        : std_logic_vector(15 downto 0);

   signal adr_pc_o_i     : std_logic_vector(15 downto 0);

   signal adr_sp_o_i     : std_logic_vector(15 downto 0);

   signal ch_a_o_i       : std_logic_vector(7 downto 0);

   signal ch_b_o_i       : std_logic_vector(7 downto 0);

   signal d_alu_n_o_i    : std_logic;

   signal d_alu_o_i      : std_logic_vector(7 downto 0);

   signal d_alu_or_o_i   : std_logic;

   signal d_regs_in_o_i  : std_logic_vector(7 downto 0);

   signal d_regs_out_o_i : std_logic_vector(7 downto 0);

   signal fetch_o_i      : std_logic;

   signal ld_o_i         : std_logic_vector(1 downto 0);

   signal ld_pc_o_i      : std_logic;

   signal ld_sp_o_i      : std_logic;

   signal load_regs_o_i  : std_logic;

   signal nmi_o_i        : std_logic;

   signal offset_o_i     : std_logic_vector(15 downto 0);

   signal q_a_o_i        : std_logic_vector(7 downto 0);

   signal q_x_o_i        : std_logic_vector(7 downto 0);

   signal q_y_o_i        : std_logic_vector(7 downto 0);

   signal reg_0flag_o_i  : std_logic;

   signal reg_1flag_o_i  : std_logic;

   signal reg_7flag_o_i  : std_logic;

   signal sel_pc_as_o_i  : std_logic;

   signal sel_pc_in_o_i  : std_logic;

   signal sel_pc_val_o_i : std_logic_vector(1 downto 0);

   signal sel_rb_in_o_i  : std_logic_vector(1 downto 0);

   signal sel_rb_out_o_i : std_logic_vector(1 downto 0);

   signal sel_reg_o_i    : std_logic_vector(1 downto 0);

   signal sel_sp_as_o_i  : std_logic;

   signal sel_sp_in_o_i  : std_logic;

   -- ModuleWare signal declarations(v1.9) for instance 'U_11' of 'add'

   signal mw_U_11temp_din0 : std_logic_vector(8 downto 0);

   signal mw_U_11temp_din1 : std_logic_vector(8 downto 0);

   signal mw_U_11sum : unsigned(8 downto 0);

   -- Component Declarations

   component FSM_Execution_Unit

   port (

      adr_nxt_pc_i : in     std_logic_vector (15 downto 0);

      adr_pc_i     : in     std_logic_vector (15 downto 0);

      adr_sp_i     : in     std_logic_vector (15 downto 0);

      clk_clk_i    : in     std_logic ;

      d_alu_i      : in     std_logic_vector ( 7 downto 0 );

      d_i          : in     std_logic_vector ( 7 downto 0 );

      d_regs_out_i : in     std_logic_vector ( 7 downto 0 );

      irq_n_i      : in     std_logic ;

      nmi_i        : in     std_logic ;

      q_a_i        : in     std_logic_vector ( 7 downto 0 );

      q_x_i        : in     std_logic_vector ( 7 downto 0 );

      q_y_i        : in     std_logic_vector ( 7 downto 0 );

      rdy_i        : in     std_logic ;

      reg_0flag_i  : in     std_logic ;

      reg_1flag_i  : in     std_logic ;

      reg_7flag_i  : in     std_logic ;

      rst_rst_n_i  : in     std_logic ;

      so_n_i       : in     std_logic ;

      a_o          : out    std_logic_vector (15 downto 0);

      adr_o        : out    std_logic_vector (15 downto 0);

      ch_a_o       : out    std_logic_vector ( 7 downto 0 );

      ch_b_o       : out    std_logic_vector ( 7 downto 0 );

      d_o          : out    std_logic_vector ( 7 downto 0 );

      d_regs_in_o  : out    std_logic_vector ( 7 downto 0 );

      fetch_o      : out    std_logic ;

      ld_o         : out    std_logic_vector ( 1 downto 0 );

      ld_pc_o      : out    std_logic ;

      ld_sp_o      : out    std_logic ;

      load_regs_o  : out    std_logic ;

      offset_o     : out    std_logic_vector ( 15 downto 0 );

      rd_o         : out    std_logic ;

      sel_pc_as_o  : out    std_logic ;

      sel_pc_in_o  : out    std_logic ;

      sel_pc_val_o : out    std_logic_vector ( 1 downto 0 );

      sel_rb_in_o  : out    std_logic_vector ( 1 downto 0 );

      sel_rb_out_o : out    std_logic_vector ( 1 downto 0 );

      sel_reg_o    : out    std_logic_vector ( 1 downto 0 );

      sel_sp_as_o  : out    std_logic ;

      sel_sp_in_o  : out    std_logic ;

      sync_o       : out    std_logic ;

      wr_n_o       : out    std_logic ;

      wr_o         : out    std_logic

   );

   end component;

   component FSM_NMI

   port (

      clk_clk_i   : in     std_logic ;

      fetch_i     : in     std_logic ;

      nmi_n_i     : in     std_logic ;

      rst_rst_n_i : in     std_logic ;

      nmi_o       : out    std_logic

   );

   end component;

   component RegBank_AXY

   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)

   );

   end component;

   component Reg_PC

   port (

      adr_i        : in     std_logic_vector (15 downto 0);

      clk_clk_i    : in     std_logic ;

      ld_i         : in     std_logic_vector (1 downto 0);

      ld_pc_i      : in     std_logic ;

      offset_i     : in     std_logic_vector (15 downto 0);

      rst_rst_n_i  : in     std_logic ;

      sel_pc_as_i  : in     std_logic ;

      sel_pc_in_i  : in     std_logic ;

      sel_pc_val_i : in     std_logic_vector (1 downto 0);

      adr_nxt_pc_o : out    std_logic_vector (15 downto 0);

      adr_pc_o     : out    std_logic_vector (15 downto 0)

   );

   end component;

   component Reg_SP

   port (

      adr_low_i   : in     std_logic_vector (7 downto 0);

      clk_clk_i   : in     std_logic ;

      ld_low_i    : in     std_logic ;

      ld_sp_i     : in     std_logic ;

      rst_rst_n_i : in     std_logic ;

      sel_sp_as_i : in     std_logic ;

      sel_sp_in_i : in     std_logic ;

      adr_sp_o    : out    std_logic_vector (15 downto 0)

   );

   end component;

   -- Optional embedded configurations

   -- pragma synthesis_off

   for all : FSM_Execution_Unit use entity R6502_TC.FSM_Execution_Unit;

   for all : FSM_NMI use entity R6502_TC.FSM_NMI;

   for all : RegBank_AXY use entity R6502_TC.RegBank_AXY;

   for all : Reg_PC use entity R6502_TC.Reg_PC;

   for all : Reg_SP use entity R6502_TC.Reg_SP;

   -- pragma synthesis_on

begin

   -- ModuleWare code(v1.9) for instance 'U_11' of 'add'

   mw_U_11temp_din0 <= '0' & ch_a_o_i;

   mw_U_11temp_din1 <= '0' & ch_b_o_i;

   u_11combo_proc: process (mw_U_11temp_din0, mw_U_11temp_din1)

   variable temp_carry : std_logic;

   begin

      temp_carry := '0';

      mw_U_11sum <= unsigned(mw_U_11temp_din0) + unsigned(mw_U_11temp_din1) + temp_carry;

   end process u_11combo_proc;

   d_alu_o_i <= conv_std_logic_vector(mw_U_11sum(7 downto 0),8);

   reg_0flag_o_i <= mw_U_11sum(8) ;

   -- ModuleWare code(v1.9) for instance 'U_8' of 'inv'

   reg_1flag_o_i <= not(d_alu_or_o_i);

   -- ModuleWare code(v1.9) for instance 'U_9' of 'inv'

   reg_7flag_o_i <= not(d_alu_n_o_i);

   -- ModuleWare code(v1.9) for instance 'U_10' of 'inv'

   d_alu_n_o_i <= not(d_alu_o_i(7));

   -- ModuleWare code(v1.9) for instance 'U_7' of 'por'

   d_alu_or_o_i <= d_alu_o_i(0) or  d_alu_o_i(1) or  d_alu_o_i(2) or  d_alu_o_i(3) or  d_alu_o_i(4) or  d_alu_o_i(5) or  d_alu_o_i(6) or  d_alu_o_i(7);

   -- Instance port mappings.

   U_4 : FSM_Execution_Unit

      port map (

         adr_nxt_pc_i => adr_nxt_pc_o_i,

         adr_pc_i     => adr_pc_o_i,

         adr_sp_i     => adr_sp_o_i,

         clk_clk_i    => clk_clk_i,

         d_alu_i      => d_alu_o_i,

         d_i          => d_i,

         d_regs_out_i => d_regs_out_o_i,

         irq_n_i      => irq_n_i,

         nmi_i        => nmi_o_i,

         q_a_i        => q_a_o_i,

         q_x_i        => q_x_o_i,

         q_y_i        => q_y_o_i,

         rdy_i        => rdy_i,

         reg_0flag_i  => reg_0flag_o_i,

         reg_1flag_i  => reg_1flag_o_i,

         reg_7flag_i  => reg_7flag_o_i,

         rst_rst_n_i  => rst_rst_n_i,

         so_n_i       => so_n_i,

         a_o          => a_o,

         adr_o        => adr_o_i,

         ch_a_o       => ch_a_o_i,

         ch_b_o       => ch_b_o_i,

         d_o          => d_o,

         d_regs_in_o  => d_regs_in_o_i,

         fetch_o      => fetch_o_i,

         ld_o         => ld_o_i,

         ld_pc_o      => ld_pc_o_i,

         ld_sp_o      => ld_sp_o_i,

         load_regs_o  => load_regs_o_i,

         offset_o     => offset_o_i,

         rd_o         => rd_o,

         sel_pc_as_o  => sel_pc_as_o_i,

         sel_pc_in_o  => sel_pc_in_o_i,

         sel_pc_val_o => sel_pc_val_o_i,

         sel_rb_in_o  => sel_rb_in_o_i,

         sel_rb_out_o => sel_rb_out_o_i,

         sel_reg_o    => sel_reg_o_i,

         sel_sp_as_o  => sel_sp_as_o_i,

         sel_sp_in_o  => sel_sp_in_o_i,

         sync_o       => sync_o,

         wr_n_o       => wr_n_o,

         wr_o         => wr_o

      );

   U_6 : FSM_NMI

      port map (

         clk_clk_i   => clk_clk_i,

         fetch_i     => fetch_o_i,

         nmi_n_i     => nmi_n_i,

         rst_rst_n_i => rst_rst_n_i,

         nmi_o       => nmi_o_i

      );

   U_2 : RegBank_AXY

      port map (

         clk_clk_i    => clk_clk_i,

         d_regs_in_i  => d_regs_in_o_i,

         load_regs_i  => load_regs_o_i,

         rst_rst_n_i  => rst_rst_n_i,

         sel_rb_in_i  => sel_rb_in_o_i,

         sel_rb_out_i => sel_rb_out_o_i,

         sel_reg_i    => sel_reg_o_i,

         d_regs_out_o => d_regs_out_o_i,

         q_a_o        => q_a_o_i,

         q_x_o        => q_x_o_i,

         q_y_o        => q_y_o_i

      );

   U_0 : Reg_PC

      port map (

         adr_i        => adr_o_i,

         clk_clk_i    => clk_clk_i,

         ld_i         => ld_o_i,

         ld_pc_i      => ld_pc_o_i,

         offset_i     => offset_o_i,

         rst_rst_n_i  => rst_rst_n_i,

         sel_pc_as_i  => sel_pc_as_o_i,

         sel_pc_in_i  => sel_pc_in_o_i,

         sel_pc_val_i => sel_pc_val_o_i,

         adr_nxt_pc_o => adr_nxt_pc_o_i,

         adr_pc_o     => adr_pc_o_i

      );

   U_1 : Reg_SP

      port map (

         adr_low_i   => adr_o_i(7 DOWNTO 0),

         clk_clk_i   => clk_clk_i,

         ld_low_i    => ld_o_i(0),

         ld_sp_i     => ld_sp_o_i,

         rst_rst_n_i => rst_rst_n_i,

         sel_sp_as_i => sel_sp_as_o_i,

         sel_sp_in_i => sel_sp_in_o_i,

         adr_sp_o    => adr_sp_o_i

      );

end struct;