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-- This sourcecode is released under BSD license.

-- Please see http://www.opensource.org/licenses/bsd-license.php for details!

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--

-- Copyright (c) 2010, Stefan Fischer <Ste.Fis@OpenCores.org>

-- All rights reserved.

--

-- Redistribution and use in source and binary forms, with or without 

-- modification, are permitted provided that the following conditions are met:

--

--  * Redistributions of source code must retain the above copyright notice, 

--    this list of conditions and the following disclaimer.

--  * Redistributions in binary form must reproduce the above copyright notice,

--    this list of conditions and the following disclaimer in the documentation

--    and/or other materials provided with the distribution. 

--  * Neither the name of the author nor the names of his contributors may be 

--    used to endorse or promote products derived from this software without 

--    specific prior written permission.

--

-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 

-- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 

-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 

-- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 

-- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 

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-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 

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--

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-- filename: picoblaze_wb_gpio.vhd

-- description: synthesizable PicoBlaze (TM) general purpose i/o example using 

--              wishbone

-- todo4user: add other modules as needed

-- version: 0.0.0

-- changelog: - 0.0.0, initial release

--            - ...

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library ieee;

use ieee.std_logic_1164.all;

entity picoblaze_wb_gpio is

  port

  (

    p_rst_n_i : in std_logic;

    p_clk_i : in std_logic;

    p_gpio_io : inout std_logic_vector(7 downto 0)

  );

end picoblaze_wb_gpio;

architecture rtl of picoblaze_wb_gpio is

  component kcpsm3 is

    port

    (

      address : out std_logic_vector(9 downto 0);

      instruction : in std_logic_vector(17 downto 0);

      port_id : out std_logic_vector(7 downto 0);

      write_strobe : out std_logic;

      out_port : out std_logic_vector(7 downto 0);

      read_strobe : out std_logic;

      in_port : in std_logic_vector(7 downto 0);

      interrupt : in std_logic;

      interrupt_ack : out std_logic;

      reset : in std_logic;

      clk : in std_logic

    );

  end component;

  component pbwbgpio is

    port

    (

      address : in std_logic_vector(9 downto 0);

      instruction : out std_logic_vector(17 downto 0);

      clk : in std_logic

    );

  end component;

  component wbm_picoblaze is

    port

    (

      rst : in std_logic;

      clk : in std_logic;

      wbm_cyc_o : out std_logic;

      wbm_stb_o : out std_logic;

      wbm_we_o : out std_logic;

      wbm_adr_o : out std_logic_vector(7 downto 0);

      wbm_dat_m2s_o : out std_logic_vector(7 downto 0);

      wbm_dat_s2m_i : in std_logic_vector(7 downto 0);

      wbm_ack_i : in std_logic;

      pb_port_id_i : in std_logic_vector(7 downto 0);

      pb_write_strobe_i : in std_logic;

      pb_out_port_i : in std_logic_vector(7 downto 0);

      pb_read_strobe_i : in std_logic;

      pb_in_port_o : out std_logic_vector(7 downto 0)

    );

  end component;

  component wbs_gpio is

    port

    (

      rst : in std_logic;

      clk : in std_logic;

      wbs_cyc_i : in std_logic;

      wbs_stb_i : in std_logic;

      wbs_we_i : in std_logic;

      wbs_adr_i : in std_logic_vector(7 downto 0);

      wbs_dat_m2s_i : in std_logic_vector(7 downto 0);

      wbs_dat_s2m_o : out std_logic_vector(7 downto 0);

      wbs_ack_o : out std_logic;

      gpio_in_i : in std_logic_vector(7 downto 0);

      gpio_out_o : out std_logic_vector(7 downto 0);

      gpio_oe_o : out std_logic_vector(7 downto 0)

    );

  end component;

  signal rst : std_logic := '1';

  signal clk : std_logic := '1';

  signal wb_cyc : std_logic := '0';

  signal wb_stb : std_logic := '0';

  signal wb_we : std_logic := '0';

  signal wb_adr : std_logic_vector(7 downto 0) := (others => '0');

  signal wb_dat_m2s : std_logic_vector(7 downto 0) := (others => '0');

  signal wb_dat_s2m : std_logic_vector(7 downto 0) := (others => '0');

  signal wb_ack : std_logic := '0';

  signal pb_write_strobe : std_logic := '0';

  signal pb_read_strobe : std_logic := '0';

  signal pb_port_id : std_logic_vector(7 downto 0) := (others => '0');

  signal pb_in_port : std_logic_vector(7 downto 0) := (others => '0');

  signal pb_out_port : std_logic_vector(7 downto 0) := (others => '0');

  signal instruction : std_logic_vector(17 downto 0) := (others => '0');

  signal address : std_logic_vector(9 downto 0) := (others => '0');

  signal interrupt : std_logic := '0';

  signal interrupt_ack : std_logic := '0';

  signal gpio_in : std_logic_vector(7 downto 0) := (others => '0');

  signal gpio_out : std_logic_vector(7 downto 0) := (others => '0');

  signal gpio_oe : std_logic_vector(7 downto 0) := (others => '0');

  constant IS_INPUT : std_logic := '0';

  constant IS_OUTPUT : std_logic := not IS_INPUT;

begin

  -- reset synchronisation

  process(clk)

  begin

    rst <= not p_rst_n_i;

  end process;

  clk <= p_clk_i;

  -- module instances

  -------------------

  inst_kcpsm3 : kcpsm3

    port map

    (

      address => address,

      instruction => instruction,

      port_id => pb_port_id,

      write_strobe => pb_write_strobe,

      out_port => pb_out_port,

      read_strobe => pb_read_strobe,

      in_port => pb_in_port,

      interrupt => interrupt,

      interrupt_ack => interrupt_ack,

      reset => rst,

      clk => clk

    );

  inst_pbwbgpio : pbwbgpio

    port map

    (

      address => address,

      instruction => instruction,

      clk => clk

    );

  inst_wbm_picoblaze : wbm_picoblaze

    port map

    (

      rst => rst,

      clk => clk,

      wbm_cyc_o => wb_cyc,

      wbm_stb_o => wb_stb,

      wbm_we_o => wb_we,

      wbm_adr_o => wb_adr,

      wbm_dat_m2s_o => wb_dat_m2s,

      wbm_dat_s2m_i => wb_dat_s2m,

      wbm_ack_i => wb_ack,

      pb_port_id_i => pb_port_id,

      pb_write_strobe_i => pb_write_strobe,

      pb_out_port_i => pb_out_port,

      pb_read_strobe_i => pb_read_strobe,

      pb_in_port_o => pb_in_port

    );

  inst_wbs_gpio : wbs_gpio

    port map

    (

      rst => rst,

      clk => clk,

      wbs_cyc_i => wb_cyc,

      wbs_stb_i => wb_stb,

      wbs_we_i => wb_we,

      wbs_adr_i => wb_adr,

      wbs_dat_m2s_i => wb_dat_m2s,

      wbs_dat_s2m_o => wb_dat_s2m,

      wbs_ack_o => wb_ack,

      gpio_in_i => gpio_in,

      gpio_out_o => gpio_out,

      gpio_oe_o => gpio_oe

    );

  -- i/o buffer generation

  gpio_in <= p_gpio_io;

  process(gpio_oe, gpio_out)

  begin

    for i in 0 to 7 loop

      if gpio_oe(i) = IS_OUTPUT then

        p_gpio_io(i) <= gpio_out(i);

      else

        p_gpio_io(i) <= 'Z';

      end if;

    end loop;

  end process;

end rtl;