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[/] [neorv32/] [trunk/] [rtl/] [core/] [neorv32_sysinfo.vhd] - Rev 16
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-- ################################################################################################# -- # << NEORV32 - System/Processor Configuration Information Memory (SYSINFO) >> # -- # ********************************************************************************************* # -- # This unit provides information regarding the 'system' configuration - mostly derived from the # -- # top's configuration generics. # -- # ********************************************************************************************* # -- # BSD 3-Clause License # -- # # -- # Copyright (c) 2020, Stephan Nolting. 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; entity neorv32_sysinfo is generic ( -- General -- CLOCK_FREQUENCY : natural := 0; -- clock frequency of clk_i in Hz BOOTLOADER_USE : boolean := true; -- implement processor-internal bootloader? USER_CODE : std_ulogic_vector(31 downto 0) := x"00000000"; -- custom user code -- Memory configuration: Instruction memory -- MEM_ISPACE_BASE : std_ulogic_vector(31 downto 0) := x"00000000"; -- base address of instruction memory space MEM_ISPACE_SIZE : natural := 8*1024; -- total size of instruction memory space in byte MEM_INT_IMEM_USE : boolean := true; -- implement processor-internal instruction memory MEM_INT_IMEM_SIZE : natural := 8*1024; -- size of processor-internal instruction memory in bytes MEM_INT_IMEM_ROM : boolean := false; -- implement processor-internal instruction memory as ROM -- Memory configuration: Data memory -- MEM_DSPACE_BASE : std_ulogic_vector(31 downto 0) := x"80000000"; -- base address of data memory space MEM_DSPACE_SIZE : natural := 4*1024; -- total size of data memory space in byte MEM_INT_DMEM_USE : boolean := true; -- implement processor-internal data memory MEM_INT_DMEM_SIZE : natural := 4*1024; -- size of processor-internal data memory in bytes -- Memory configuration: External memory interface -- MEM_EXT_USE : boolean := false; -- implement external memory bus interface? -- Processor peripherals -- IO_GPIO_USE : boolean := true; -- implement general purpose input/output port unit (GPIO)? IO_MTIME_USE : boolean := true; -- implement machine system timer (MTIME)? IO_UART_USE : boolean := true; -- implement universal asynchronous receiver/transmitter (UART)? IO_SPI_USE : boolean := true; -- implement serial peripheral interface (SPI)? IO_TWI_USE : boolean := true; -- implement two-wire interface (TWI)? IO_PWM_USE : boolean := true; -- implement pulse-width modulation unit (PWM)? IO_WDT_USE : boolean := true; -- implement watch dog timer (WDT)? IO_TRNG_USE : boolean := true; -- implement true random number generator (TRNG)? IO_DEVNULL_USE : boolean := true -- implement dummy device (DEVNULL)? ); port ( -- host access -- clk_i : in std_ulogic; -- global clock line addr_i : in std_ulogic_vector(31 downto 0); -- address rden_i : in std_ulogic; -- read enable data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic -- transfer acknowledge ); end neorv32_sysinfo; architecture neorv32_sysinfo_rtl of neorv32_sysinfo is -- IO space: module base address -- constant hi_abb_c : natural := index_size_f(io_size_c)-1; -- high address boundary bit constant lo_abb_c : natural := index_size_f(sysinfo_size_c); -- low address boundary bit -- access control -- signal acc_en : std_ulogic; -- module access enable signal addr : std_ulogic_vector(31 downto 0); signal rden : std_ulogic; signal info_addr : std_ulogic_vector(02 downto 0); -- system information ROM -- type info_mem_t is array (0 to 7) of std_ulogic_vector(31 downto 0); signal sysinfo_mem : info_mem_t; begin -- Access Control ------------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- acc_en <= '1' when (addr_i(hi_abb_c downto lo_abb_c) = sysinfo_base_c(hi_abb_c downto lo_abb_c)) else '0'; rden <= acc_en and rden_i; -- valid read access addr <= sysinfo_base_c(31 downto lo_abb_c) & addr_i(lo_abb_c-1 downto 2) & "00"; -- word aligned info_addr <= addr(index_size_f(sysinfo_size_c)-1 downto 2); -- Construct Info ROM --------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- SYSINFO(0): Processor (primary) clock frequency -- sysinfo_mem(0) <= std_ulogic_vector(to_unsigned(CLOCK_FREQUENCY, 32)); -- SYSINFO(1): Custom user code -- sysinfo_mem(1) <= USER_CODE; -- SYSINFO(2): Implemented processor devices/features -- -- Memory sysinfo_mem(2)(00) <= bool_to_ulogic_f(BOOTLOADER_USE); -- implement processor-internal bootloader? sysinfo_mem(2)(01) <= bool_to_ulogic_f(MEM_EXT_USE); -- implement external memory bus interface? sysinfo_mem(2)(02) <= bool_to_ulogic_f(MEM_INT_IMEM_USE); -- implement processor-internal instruction memory? sysinfo_mem(2)(03) <= bool_to_ulogic_f(MEM_INT_IMEM_ROM); -- implement processor-internal instruction memory as ROM? sysinfo_mem(2)(04) <= bool_to_ulogic_f(MEM_INT_DMEM_USE); -- implement processor-internal data memory? sysinfo_mem(2)(15 downto 05) <= (others => '0'); -- reserved -- IO sysinfo_mem(2)(16) <= bool_to_ulogic_f(IO_GPIO_USE); -- implement general purpose input/output port unit (GPIO)? sysinfo_mem(2)(17) <= bool_to_ulogic_f(IO_MTIME_USE); -- implement machine system timer (MTIME)? sysinfo_mem(2)(18) <= bool_to_ulogic_f(IO_UART_USE); -- implement universal asynchronous receiver/transmitter (UART)? sysinfo_mem(2)(19) <= bool_to_ulogic_f(IO_SPI_USE); -- implement serial peripheral interface (SPI)? sysinfo_mem(2)(20) <= bool_to_ulogic_f(IO_TWI_USE); -- implement two-wire interface (TWI)? sysinfo_mem(2)(21) <= bool_to_ulogic_f(IO_PWM_USE); -- implement pulse-width modulation unit (PWM)? sysinfo_mem(2)(22) <= bool_to_ulogic_f(IO_WDT_USE); -- implement watch dog timer (WDT)? sysinfo_mem(2)(23) <= '0'; sysinfo_mem(2)(24) <= bool_to_ulogic_f(IO_TRNG_USE); -- implement true random number generator (TRNG)? sysinfo_mem(2)(25) <= bool_to_ulogic_f(IO_DEVNULL_USE); -- implement dummy device (DEVNULL)? sysinfo_mem(2)(31 downto 26) <= (others => '0'); -- reserved -- SYSINFO(3): reserved -- sysinfo_mem(3) <= (others => '0'); -- reserved - maybe for technology-specific configuration options? -- SYSINFO(4): Base address of instruction memory space -- sysinfo_mem(4) <= MEM_ISPACE_BASE; -- SYSINFO(5): Base address of data memory space -- sysinfo_mem(5) <= MEM_DSPACE_BASE; -- SYSINFO(6): Total size of instruction memory space in bytes -- sysinfo_mem(6) <= std_ulogic_vector(to_unsigned(MEM_ISPACE_SIZE, 32)); -- SYSINFO(7): Total size of data memory space in bytes -- sysinfo_mem(7) <= std_ulogic_vector(to_unsigned(MEM_DSPACE_SIZE, 32)); -- Read Access ---------------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- read_access: process(clk_i) begin if rising_edge(clk_i) then ack_o <= rden; if (rden = '1') then data_o <= sysinfo_mem(to_integer(unsigned(info_addr))); else data_o <= (others => '0'); end if; end if; end process read_access; end neorv32_sysinfo_rtl;
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