Subversion Repositories spi_boot

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

--

-- SD/MMC Bootloader

-- Chip toplevel design with MMC feature set

--

-- $Id: chip-mmc-a.vhd 77 2009-04-01 19:53:14Z arniml $

--

-- Copyright (c) 2005, Arnim Laeuger (arniml@opencores.org)

--

-- All rights reserved, see COPYING.

--

-- Redistribution and use in source and synthezised 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 synthesized 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 other 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 AUTHOR OR CONTRIBUTORS BE

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

-- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

-- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

-- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

-- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

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

-- POSSIBILITY OF SUCH DAMAGE.

--

-- Please report bugs to the author, but before you do so, please

-- make sure that this is not a derivative work and that

-- you have the latest version of this file.

--

-- The latest version of this file can be found at:

--      http://www.opencores.org/projects.cgi/web/spi_boot/overview

--

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

library ieee;

use ieee.std_logic_1164.all;

architecture mmc of chip is

  component spi_boot

    generic (

      width_bit_cnt_g      : integer := 6;

      width_img_cnt_g      : integer := 2;

      num_bits_per_img_g   : integer := 18;

      sd_init_g            : integer := 0;

      mmc_compat_clk_div_g : integer := 0;

      width_mmc_clk_div_g  : integer := 0;

      reset_level_g        : integer := 0

    );

    port (

      clk_i          : in  std_logic;

      reset_i        : in  std_logic;

      set_sel_i      : in  std_logic_vector(31-width_img_cnt_g-num_bits_per_img_g

                                            downto 0);

      spi_clk_o      : out std_logic;

      spi_cs_n_o     : out std_logic;

      spi_data_in_i  : in  std_logic;

      spi_data_out_o : out std_logic;

      spi_en_outs_o  : out std_logic;

      start_i        : in  std_logic;

      mode_i         : in  std_logic;

      config_n_o     : out std_logic;

      detached_o     : out std_logic;

      cfg_init_n_i   : in  std_logic;

      cfg_done_i     : in  std_logic;

      dat_done_i     : in  std_logic;

      cfg_clk_o      : out std_logic;

      cfg_dat_o      : out std_logic

    );

  end component;

  signal spi_clk_s      : std_logic;

  signal spi_cs_n_s     : std_logic;

  signal spi_data_out_s : std_logic;

  signal spi_en_outs_s  : std_logic;

  constant width_img_cnt_c    : integer := 2;   -- 4 images

  constant num_bits_per_img_c : integer := 18;  -- 256 kByte per image

  constant set_sel_width_c    : integer := 31-width_img_cnt_c-num_bits_per_img_c;

  signal   set_sel_s          : std_logic_vector(set_sel_width_c downto 0);

begin

  set_sel_s <= (3 => not set_sel_n_i(3),

                2 => not set_sel_n_i(2),

                1 => not set_sel_n_i(1),

                others => '0');

  spi_boot_b : spi_boot

    generic map (

      width_bit_cnt_g      => 12,       -- 512 bytes per block

      width_img_cnt_g      => width_img_cnt_c,

      num_bits_per_img_g   => num_bits_per_img_c,

      sd_init_g            => 0,        -- no SD specific initialization

      mmc_compat_clk_div_g => 13,       -- MMC compat 400 kHz > 10 MHz / (13*2)

      width_mmc_clk_div_g  => 4         -- need 5 bits for MMC compat divider

    )

    port map (

      clk_i                => clk_i,

      reset_i              => reset_i,

      set_sel_i            => set_sel_s,

      spi_clk_o            => spi_clk_s,

      spi_cs_n_o           => spi_cs_n_s,

      spi_data_in_i        => spi_data_in_i,

      spi_data_out_o       => spi_data_out_s,

      spi_en_outs_o        => spi_en_outs_s,

      start_i              => start_i,

      mode_i               => mode_i,

      config_n_o           => config_n_o,

      detached_o           => detached_o,

      cfg_init_n_i         => cfg_init_n_i,

      cfg_done_i           => cfg_done_i,

      dat_done_i           => dat_done_i,

      cfg_clk_o            => cfg_clk_o,

      cfg_dat_o            => cfg_dat_o

    );

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

  -- Three state drivers for SPI outputs.

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

  spi_clk_o      <=   spi_clk_s

                    when spi_en_outs_s = '1' else

                      'Z';

  spi_cs_n_o     <=   spi_cs_n_s

                    when spi_en_outs_s = '1' else

                      'Z';

  spi_data_out_o <=   spi_data_out_s

                    when spi_en_outs_s = '1' else

                      'Z';

end mmc;