1 | ------------------------------------------------------------------------------- |
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2 | -- |
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3 | -- SD/MMC Bootloader |
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4 | -- Chip toplevel design with full feature set |
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5 | -- |
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6 | -- $Id: chip-full-a.vhd 77 2009-04-01 19:53:14Z arniml $ |
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7 | -- |
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8 | -- Copyright (c) 2005, Arnim Laeuger (arniml@opencores.org) |
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9 | -- |
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10 | -- All rights reserved, see COPYING. |
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11 | -- |
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12 | -- Redistribution and use in source and synthezised forms, with or without |
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13 | -- modification, are permitted provided that the following conditions are met: |
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14 | -- |
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15 | -- Redistributions of source code must retain the above copyright notice, |
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16 | -- this list of conditions and the following disclaimer. |
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17 | -- |
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18 | -- Redistributions in synthesized form must reproduce the above copyright |
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19 | -- notice, this list of conditions and the following disclaimer in the |
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20 | -- documentation and/or other materials provided with the distribution. |
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21 | -- |
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22 | -- Neither the name of the author nor the names of other contributors may |
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23 | -- be used to endorse or promote products derived from this software without |
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24 | -- specific prior written permission. |
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25 | -- |
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26 | -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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27 | -- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
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28 | -- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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29 | -- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE |
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30 | -- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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31 | -- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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32 | -- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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33 | -- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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34 | -- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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35 | -- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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36 | -- POSSIBILITY OF SUCH DAMAGE. |
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37 | -- |
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38 | -- Please report bugs to the author, but before you do so, please |
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39 | -- make sure that this is not a derivative work and that |
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40 | -- you have the latest version of this file. |
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41 | -- |
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42 | -- The latest version of this file can be found at: |
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43 | -- http://www.opencores.org/projects.cgi/web/spi_boot/overview |
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44 | -- |
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45 | ------------------------------------------------------------------------------- |
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46 | |
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47 | library ieee; |
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48 | use ieee.std_logic_1164.all; |
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49 | |
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50 | |
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51 | architecture full of chip is |
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52 | |
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53 | component spi_boot |
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54 | generic ( |
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55 | width_bit_cnt_g : integer := 6; |
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56 | width_img_cnt_g : integer := 2; |
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57 | num_bits_per_img_g : integer := 18; |
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58 | sd_init_g : integer := 0; |
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59 | mmc_compat_clk_div_g : integer := 0; |
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60 | width_mmc_clk_div_g : integer := 0; |
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61 | reset_level_g : integer := 0 |
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62 | ); |
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63 | port ( |
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64 | clk_i : in std_logic; |
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65 | reset_i : in std_logic; |
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66 | set_sel_i : in std_logic_vector(31-width_img_cnt_g-num_bits_per_img_g |
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67 | downto 0); |
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68 | spi_clk_o : out std_logic; |
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69 | spi_cs_n_o : out std_logic; |
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70 | spi_data_in_i : in std_logic; |
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71 | spi_data_out_o : out std_logic; |
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72 | spi_en_outs_o : out std_logic; |
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73 | start_i : in std_logic; |
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74 | mode_i : in std_logic; |
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75 | config_n_o : out std_logic; |
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76 | detached_o : out std_logic; |
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77 | cfg_init_n_i : in std_logic; |
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78 | cfg_done_i : in std_logic; |
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79 | dat_done_i : in std_logic; |
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80 | cfg_clk_o : out std_logic; |
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81 | cfg_dat_o : out std_logic |
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82 | ); |
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83 | end component; |
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84 | |
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85 | signal spi_clk_s : std_logic; |
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86 | signal spi_cs_n_s : std_logic; |
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87 | signal spi_data_out_s : std_logic; |
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88 | signal spi_en_outs_s : std_logic; |
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89 | |
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90 | constant width_img_cnt_c : integer := 2; -- 4 images |
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91 | constant num_bits_per_img_c : integer := 18; -- 256 kByte per image |
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92 | constant set_sel_width_c : integer := 31-width_img_cnt_c-num_bits_per_img_c; |
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93 | signal set_sel_s : std_logic_vector(set_sel_width_c downto 0); |
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94 | |
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95 | begin |
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96 | |
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97 | set_sel_s <= (3 => not set_sel_n_i(3), |
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98 | 2 => not set_sel_n_i(2), |
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99 | 1 => not set_sel_n_i(1), |
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100 | 0 => not set_sel_n_i(0), |
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101 | others => '0'); |
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102 | |
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103 | spi_boot_b : spi_boot |
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104 | generic map ( |
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105 | width_bit_cnt_g => 12, -- 512 bytes per block |
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106 | width_img_cnt_g => width_img_cnt_c, |
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107 | num_bits_per_img_g => num_bits_per_img_c, |
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108 | sd_init_g => 1, -- use SD specific initialization |
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109 | mmc_compat_clk_div_g => 13, -- MMC compat 400 kHz > 10 MHz / (13*2) |
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110 | width_mmc_clk_div_g => 4 -- need 5 bits for MMC compat divider |
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111 | ) |
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112 | port map ( |
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113 | clk_i => clk_i, |
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114 | reset_i => reset_i, |
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115 | set_sel_i => set_sel_s, |
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116 | spi_clk_o => spi_clk_s, |
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117 | spi_cs_n_o => spi_cs_n_s, |
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118 | spi_data_in_i => spi_data_in_i, |
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119 | spi_data_out_o => spi_data_out_s, |
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120 | spi_en_outs_o => spi_en_outs_s, |
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121 | start_i => start_i, |
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122 | mode_i => mode_i, |
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123 | config_n_o => config_n_o, |
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124 | detached_o => detached_o, |
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125 | cfg_init_n_i => cfg_init_n_i, |
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126 | cfg_done_i => cfg_done_i, |
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127 | dat_done_i => dat_done_i, |
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128 | cfg_clk_o => cfg_clk_o, |
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129 | cfg_dat_o => cfg_dat_o |
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130 | ); |
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131 | |
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132 | ----------------------------------------------------------------------------- |
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133 | -- Three state drivers for SPI outputs. |
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134 | ----------------------------------------------------------------------------- |
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135 | spi_clk_o <= spi_clk_s |
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136 | when spi_en_outs_s = '1' else |
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137 | 'Z'; |
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138 | spi_cs_n_o <= spi_cs_n_s |
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139 | when spi_en_outs_s = '1' else |
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140 | 'Z'; |
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141 | spi_data_out_o <= spi_data_out_s |
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142 | when spi_en_outs_s = '1' else |
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143 | 'Z'; |
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144 | |
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145 | end full; |
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