tmeissner
/
gatemate_experiments


								-- #################################################################################################

								-- # << NEORV32 - Example setup including the bootloader, for the Gatemate (c) Eval Board >>       #

								-- # ********************************************************************************************* #

								-- # BSD 3-Clause License                                                                          #

								-- #                                                                                               #

								-- # Copyright (c) 2022, Torsten Meissner. All rights reserved.                                    #

								-- #                                                                                               #

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

								-- # permitted provided that the following conditions are met:                                     #

								-- #                                                                                               #

								-- # 1. Redistributions of source code must retain the above copyright notice, this list of        #

								-- #    conditions and the following disclaimer.                                                   #

								-- #                                                                                               #

								-- # 2. 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.                                                            #

								-- #                                                                                               #

								-- # 3. Neither the name of the copyright holder nor the names of its 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 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.                                                            #

								-- # ********************************************************************************************* #

								-- # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #

								-- #################################################################################################


								library ieee;

								use ieee.std_logic_1164.all;

								use ieee.numeric_std.all;


								library neorv32;

								use neorv32.neorv32_package.all;


								library gatemate;

								use gatemate.components.all;


								entity neorv32_aes is

								  port (

								    -- Clock and Reset inputs

								    clk_i     : in  std_logic;  -- 10 MHz clock

								    rst_n_i   : in  std_logic;  -- SW3 button

								    -- LED outputs

								    led_n_o   : out std_logic_vector(7 downto 0);

								    -- UART0

								--    uart_rx_i : in  std_logic;  -- PMODA IO

								--    uart_tx_o : out std_logic   -- PMODA IO

								    debug_o : out std_logic_vector(15 downto 0)

								  );

								end entity;


								architecture rtl of neorv32_aes is


								  -- configuration --

								  constant f_clock_c : natural := 10_000_000; -- clock frequency in Hz


								  -- Globals

								  signal s_pll_lock : std_logic;

								  signal s_pll_clk  : std_logic;

								  signal s_cfg_end  : std_logic;


								  signal s_rst_n          : std_logic;

								  signal s_rst_debounced : std_logic;


								  signal s_con_gpio : std_ulogic_vector(63 downto 0);


								  signal s_debug : std_logic_vector(63 downto 0);


								begin


								  PLL : CC_PLL

								  generic map (

								    REF_CLK => "10",

								    OUT_CLK => "10",

								    PERF_MD => "SPEED"

								  )

								  port map (

								    CLK_REF             => clk_i,

								    USR_CLK_REF         => '0',

								    CLK_FEEDBACK        => '0',

								    USR_LOCKED_STDY_RST => '0',

								    USR_PLL_LOCKED_STDY => open,

								    USR_PLL_LOCKED      => s_pll_lock,

								    CLK0                => s_pll_clk,

								    CLK90               => open,

								    CLK180              => open,

								    CLK270              => open,

								    CLK_REF_OUT         => open

								  );


								  cfg_end : CC_CFG_END

								  port map (

								    CFG_END => s_cfg_end

								  );


								   rst_debounce : block is

								    signal s_rst_d : std_logic_vector(29 downto 0);

								  begin

								    process (s_pll_clk, rst_n_i) is

								    begin

								      if (not rst_n_i) then

								        s_rst_d <= (others => '0');

								      elsif (rising_edge(s_pll_clk)) then

								        s_rst_d <= s_rst_d(s_rst_d'left-1 downto 0) & rst_n_i;

								      end if;

								    end process;

								    s_rst_debounced <= and s_rst_d;

								  end block rst_debounce;


								  s_rst_n <= s_pll_lock and s_cfg_end and s_rst_debounced;


								  -- The core of the problem ----------------------------------------------------------------

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

								  neorv32_inst: entity neorv32.neorv32_top

								  generic map (

								    CLOCK_FREQUENCY              => f_clock_c, -- clock frequency of s_pll_clk in Hz

								    INT_BOOTLOADER_EN            => false,     -- boot configuration: true = boot explicit bootloader; false = boot from int/ext (I)MEM

								    -- RISC-V CPU Extensions --

								    CPU_EXTENSION_RISCV_C        => false,     -- implement compressed extension?

								    CPU_EXTENSION_RISCV_M        => true,      -- implement mul/div extension?

								    CPU_EXTENSION_RISCV_Zicsr    => true,      -- implement CSR system?

								    CPU_EXTENSION_RISCV_Zicntr   => true,      -- implement base counters?

								    -- Tuning Options --

								    FAST_MUL_EN                  => false,

								    FAST_SHIFT_EN                => false,

								    -- Internal Instruction memory --

								    MEM_INT_IMEM_EN              => true,      -- implement processor-internal instruction memory

								    MEM_INT_IMEM_SIZE            => 4*1024,    --16*1024,   -- size of processor-internal instruction memory in bytes

								    -- Internal Data memory --

								    MEM_INT_DMEM_EN              => true,       -- implement processor-internal data memory

								    MEM_INT_DMEM_SIZE            => 8*1024,    -- size of processor-internal data memory in bytes

								    -- Processor peripherals --

								    IO_GPIO_EN                   => true,      -- implement general purpose input/output port unit (GPIO)?

								    IO_MTIME_EN                  => true,      -- implement machine system timer (MTIME)?

								    IO_UART0_EN                  => false,     -- implement primary universal asynchronous receiver/transmitter (UART0)?

								    IO_CFS_EN                    => false,     -- implement custom functions subsystem (CFS)?

								    IO_AES_EN                    => true       -- implement AES(128) custom function?

								  )

								  port map (

								    -- Global control --

								    clk_i  => std_ulogic(s_pll_clk),

								    rstn_i => std_ulogic(s_rst_n),

									  -- GPIO

								    gpio_o  => s_con_gpio,

								    -- primary UART0

								    uart0_txd_o => open,  -- uart_tx_o,

								    uart0_rxd_i => '1',  -- uart_rx_i,

								    -- debug

								    debug_o => s_debug

								  );


								  debug_o <= s_debug(15 downto 0);


								  -- p_r ERROR when connecting uart_rx_i & yosys option -retime (with both Yosys inferred & instantiated CC_BRAM_40K or CC_BRAM_40K memory)

								  --   FATAL ERROR: RAM 4070 Output DOA[6] not used but Input DIA[6] used!

								  --   program finished with exit code: 2


								  -- IO Connection --------------------------------------------------------------------------

								  led_n_o <= not std_logic_vector(s_con_gpio(7 downto 0));


								end architecture;