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-- # This unit provides information regarding the 'processor system' configuration - #
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-- # This unit provides information regarding the 'processor system' configuration - #
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-- # mostly derived from the top's configuration generics. #
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-- # mostly derived from the top's configuration generics. #
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-- # ********************************************************************************************* #
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-- # ********************************************************************************************* #
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-- # BSD 3-Clause License #
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-- # BSD 3-Clause License #
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-- # #
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-- # #
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-- # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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-- # Copyright (c) 2021, Stephan Nolting. All rights reserved. #
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-- # #
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-- # #
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-- # Redistribution and use in source and binary forms, with or without modification, are #
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-- # Redistribution and use in source and binary forms, with or without modification, are #
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-- # permitted provided that the following conditions are met: #
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-- # permitted provided that the following conditions are met: #
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-- # #
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-- # #
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-- # 1. Redistributions of source code must retain the above copyright notice, this list of #
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-- # 1. Redistributions of source code must retain the above copyright notice, this list of #
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entity neorv32_sysinfo is
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entity neorv32_sysinfo is
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generic (
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generic (
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-- General --
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-- General --
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CLOCK_FREQUENCY : natural := 0; -- clock frequency of clk_i in Hz
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CLOCK_FREQUENCY : natural := 0; -- clock frequency of clk_i in Hz
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BOOTLOADER_USE : boolean := true; -- implement processor-internal bootloader?
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BOOTLOADER_EN : boolean := true; -- implement processor-internal bootloader?
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USER_CODE : std_ulogic_vector(31 downto 0) := x"00000000"; -- custom user code
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USER_CODE : std_ulogic_vector(31 downto 0) := x"00000000"; -- custom user code
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-- Internal Instruction memory --
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-- Internal Instruction memory --
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MEM_INT_IMEM_USE : boolean := true; -- implement processor-internal instruction memory
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MEM_INT_IMEM_EN : boolean := true; -- implement processor-internal instruction memory
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MEM_INT_IMEM_SIZE : natural := 8*1024; -- size of processor-internal instruction memory in bytes
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MEM_INT_IMEM_SIZE : natural := 8*1024; -- size of processor-internal instruction memory in bytes
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MEM_INT_IMEM_ROM : boolean := false; -- implement processor-internal instruction memory as ROM
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MEM_INT_IMEM_ROM : boolean := false; -- implement processor-internal instruction memory as ROM
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-- Internal Data memory --
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-- Internal Data memory --
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MEM_INT_DMEM_USE : boolean := true; -- implement processor-internal data memory
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MEM_INT_DMEM_EN : boolean := true; -- implement processor-internal data memory
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MEM_INT_DMEM_SIZE : natural := 4*1024; -- size of processor-internal data memory in bytes
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MEM_INT_DMEM_SIZE : natural := 4*1024; -- size of processor-internal data memory in bytes
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-- Internal Cache memory --
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-- Internal Cache memory --
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ICACHE_USE : boolean := true; -- implement instruction cache
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ICACHE_EN : boolean := true; -- implement instruction cache
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ICACHE_NUM_BLOCKS : natural := 4; -- i-cache: number of blocks (min 2), has to be a power of 2
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ICACHE_NUM_BLOCKS : natural := 4; -- i-cache: number of blocks (min 2), has to be a power of 2
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ICACHE_BLOCK_SIZE : natural := 64; -- i-cache: block size in bytes (min 4), has to be a power of 2
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ICACHE_BLOCK_SIZE : natural := 64; -- i-cache: block size in bytes (min 4), has to be a power of 2
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ICACHE_ASSOCIATIVITY : natural := 1; -- i-cache: associativity (min 1), has to be a power 2
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ICACHE_ASSOCIATIVITY : natural := 1; -- i-cache: associativity (min 1), has to be a power 2
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-- External memory interface --
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-- External memory interface --
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MEM_EXT_USE : boolean := false; -- implement external memory bus interface?
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MEM_EXT_EN : boolean := false; -- implement external memory bus interface?
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-- Processor peripherals --
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-- Processor peripherals --
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IO_GPIO_USE : boolean := true; -- implement general purpose input/output port unit (GPIO)?
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IO_GPIO_EN : boolean := true; -- implement general purpose input/output port unit (GPIO)?
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IO_MTIME_USE : boolean := true; -- implement machine system timer (MTIME)?
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IO_MTIME_EN : boolean := true; -- implement machine system timer (MTIME)?
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IO_UART_USE : boolean := true; -- implement universal asynchronous receiver/transmitter (UART)?
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IO_UART_EN : boolean := true; -- implement universal asynchronous receiver/transmitter (UART)?
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IO_SPI_USE : boolean := true; -- implement serial peripheral interface (SPI)?
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IO_SPI_EN : boolean := true; -- implement serial peripheral interface (SPI)?
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IO_TWI_USE : boolean := true; -- implement two-wire interface (TWI)?
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IO_TWI_EN : boolean := true; -- implement two-wire interface (TWI)?
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IO_PWM_USE : boolean := true; -- implement pulse-width modulation unit (PWM)?
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IO_PWM_EN : boolean := true; -- implement pulse-width modulation unit (PWM)?
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IO_WDT_USE : boolean := true; -- implement watch dog timer (WDT)?
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IO_WDT_EN : boolean := true; -- implement watch dog timer (WDT)?
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IO_TRNG_USE : boolean := true; -- implement true random number generator (TRNG)?
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IO_TRNG_EN : boolean := true; -- implement true random number generator (TRNG)?
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IO_CFU0_USE : boolean := true; -- implement custom functions unit 0 (CFU0)?
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IO_CFU0_EN : boolean := true; -- implement custom functions unit 0 (CFU0)?
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IO_CFU1_USE : boolean := true -- implement custom functions unit 1 (CFU1)?
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IO_CFU1_EN : boolean := true -- implement custom functions unit 1 (CFU1)?
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);
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);
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port (
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port (
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-- host access --
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-- host access --
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clk_i : in std_ulogic; -- global clock line
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clk_i : in std_ulogic; -- global clock line
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addr_i : in std_ulogic_vector(31 downto 0); -- address
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addr_i : in std_ulogic_vector(31 downto 0); -- address
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-- SYSINFO(1): Custom user code/ID --
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-- SYSINFO(1): Custom user code/ID --
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sysinfo_mem(1) <= USER_CODE;
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sysinfo_mem(1) <= USER_CODE;
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-- SYSINFO(2): Implemented processor devices/features --
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-- SYSINFO(2): Implemented processor devices/features --
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-- Memory --
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-- Memory --
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sysinfo_mem(2)(00) <= bool_to_ulogic_f(BOOTLOADER_USE); -- processor-internal bootloader implemented?
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sysinfo_mem(2)(00) <= bool_to_ulogic_f(BOOTLOADER_EN); -- processor-internal bootloader implemented?
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sysinfo_mem(2)(01) <= bool_to_ulogic_f(MEM_EXT_USE); -- external memory bus interface implemented?
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sysinfo_mem(2)(01) <= bool_to_ulogic_f(MEM_EXT_EN); -- external memory bus interface implemented?
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sysinfo_mem(2)(02) <= bool_to_ulogic_f(MEM_INT_IMEM_USE); -- processor-internal instruction memory implemented?
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sysinfo_mem(2)(02) <= bool_to_ulogic_f(MEM_INT_IMEM_EN); -- processor-internal instruction memory implemented?
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sysinfo_mem(2)(03) <= bool_to_ulogic_f(MEM_INT_IMEM_ROM); -- processor-internal instruction memory implemented as ROM?
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sysinfo_mem(2)(03) <= bool_to_ulogic_f(MEM_INT_IMEM_ROM); -- processor-internal instruction memory implemented as ROM?
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sysinfo_mem(2)(04) <= bool_to_ulogic_f(MEM_INT_DMEM_USE); -- processor-internal data memory implemented?
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sysinfo_mem(2)(04) <= bool_to_ulogic_f(MEM_INT_DMEM_EN); -- processor-internal data memory implemented?
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sysinfo_mem(2)(05) <= bool_to_ulogic_f(xbus_big_endian_c); -- is external memory bus interface using BIG-endian byte-order?
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sysinfo_mem(2)(05) <= bool_to_ulogic_f(xbus_big_endian_c); -- is external memory bus interface using BIG-endian byte-order?
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sysinfo_mem(2)(06) <= bool_to_ulogic_f(ICACHE_USE); -- processor-internal instruction cache implemented?
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sysinfo_mem(2)(06) <= bool_to_ulogic_f(ICACHE_EN); -- processor-internal instruction cache implemented?
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--
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--
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sysinfo_mem(2)(15 downto 07) <= (others => '0'); -- reserved
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sysinfo_mem(2)(15 downto 07) <= (others => '0'); -- reserved
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-- IO --
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-- IO --
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sysinfo_mem(2)(16) <= bool_to_ulogic_f(IO_GPIO_USE); -- general purpose input/output port unit (GPIO) implemented?
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sysinfo_mem(2)(16) <= bool_to_ulogic_f(IO_GPIO_EN); -- general purpose input/output port unit (GPIO) implemented?
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sysinfo_mem(2)(17) <= bool_to_ulogic_f(IO_MTIME_USE); -- machine system timer (MTIME) implemented?
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sysinfo_mem(2)(17) <= bool_to_ulogic_f(IO_MTIME_EN); -- machine system timer (MTIME) implemented?
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sysinfo_mem(2)(18) <= bool_to_ulogic_f(IO_UART_USE); -- universal asynchronous receiver/transmitter (UART) implemented?
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sysinfo_mem(2)(18) <= bool_to_ulogic_f(IO_UART_EN); -- universal asynchronous receiver/transmitter (UART) implemented?
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sysinfo_mem(2)(19) <= bool_to_ulogic_f(IO_SPI_USE); -- serial peripheral interface (SPI) implemented?
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sysinfo_mem(2)(19) <= bool_to_ulogic_f(IO_SPI_EN); -- serial peripheral interface (SPI) implemented?
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sysinfo_mem(2)(20) <= bool_to_ulogic_f(IO_TWI_USE); -- two-wire interface (TWI) implemented?
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sysinfo_mem(2)(20) <= bool_to_ulogic_f(IO_TWI_EN); -- two-wire interface (TWI) implemented?
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sysinfo_mem(2)(21) <= bool_to_ulogic_f(IO_PWM_USE); -- pulse-width modulation unit (PWM) implemented?
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sysinfo_mem(2)(21) <= bool_to_ulogic_f(IO_PWM_EN); -- pulse-width modulation unit (PWM) implemented?
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sysinfo_mem(2)(22) <= bool_to_ulogic_f(IO_WDT_USE); -- watch dog timer (WDT) implemented?
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sysinfo_mem(2)(22) <= bool_to_ulogic_f(IO_WDT_EN); -- watch dog timer (WDT) implemented?
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sysinfo_mem(2)(23) <= bool_to_ulogic_f(IO_CFU0_USE); -- custom functions unit 0 (CFU0) implemented?
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sysinfo_mem(2)(23) <= bool_to_ulogic_f(IO_CFU0_EN); -- custom functions unit 0 (CFU0) implemented?
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sysinfo_mem(2)(24) <= bool_to_ulogic_f(IO_TRNG_USE); -- true random number generator (TRNG) implemented?
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sysinfo_mem(2)(24) <= bool_to_ulogic_f(IO_TRNG_EN); -- true random number generator (TRNG) implemented?
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sysinfo_mem(2)(25) <= bool_to_ulogic_f(IO_CFU1_USE); -- custom functions unit 1 (CFU1) implemented?
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sysinfo_mem(2)(25) <= bool_to_ulogic_f(IO_CFU1_EN); -- custom functions unit 1 (CFU1) implemented?
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--
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--
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sysinfo_mem(2)(31 downto 26) <= (others => '0'); -- reserved
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sysinfo_mem(2)(31 downto 26) <= (others => '0'); -- reserved
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-- SYSINFO(3): Cache configuration --
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-- SYSINFO(3): Cache configuration --
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sysinfo_mem(3)(03 downto 00) <= std_ulogic_vector(to_unsigned(index_size_f(ICACHE_BLOCK_SIZE), 4)) when (ICACHE_USE = true) else (others => '0'); -- i-cache: log2(block_size_in_bytes)
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sysinfo_mem(3)(03 downto 00) <= std_ulogic_vector(to_unsigned(index_size_f(ICACHE_BLOCK_SIZE), 4)) when (ICACHE_EN = true) else (others => '0'); -- i-cache: log2(block_size_in_bytes)
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sysinfo_mem(3)(07 downto 04) <= std_ulogic_vector(to_unsigned(index_size_f(ICACHE_NUM_BLOCKS), 4)) when (ICACHE_USE = true) else (others => '0'); -- i-cache: log2(number_of_block)
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sysinfo_mem(3)(07 downto 04) <= std_ulogic_vector(to_unsigned(index_size_f(ICACHE_NUM_BLOCKS), 4)) when (ICACHE_EN = true) else (others => '0'); -- i-cache: log2(number_of_block)
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sysinfo_mem(3)(11 downto 08) <= std_ulogic_vector(to_unsigned(index_size_f(ICACHE_ASSOCIATIVITY), 4)) when (ICACHE_USE = true) else (others => '0'); -- i-cache: log2(associativity)
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sysinfo_mem(3)(11 downto 08) <= std_ulogic_vector(to_unsigned(index_size_f(ICACHE_ASSOCIATIVITY), 4)) when (ICACHE_EN = true) else (others => '0'); -- i-cache: log2(associativity)
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sysinfo_mem(3)(15 downto 12) <= (others => '0'); -- replacement strategy (irrelevant since i-cache is read-only)
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sysinfo_mem(3)(15 downto 12) <= (others => '0'); -- replacement strategy (irrelevant since i-cache is read-only)
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--
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--
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sysinfo_mem(3)(19 downto 16) <= (others => '0'); -- reserved (for d-cache.block_size)
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sysinfo_mem(3)(19 downto 16) <= (others => '0'); -- reserved (for d-cache.block_size)
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sysinfo_mem(3)(23 downto 20) <= (others => '0'); -- reserved (for d-cache.num_blocks)
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sysinfo_mem(3)(23 downto 20) <= (others => '0'); -- reserved (for d-cache.num_blocks)
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sysinfo_mem(3)(27 downto 24) <= (others => '0'); -- reserved (for d-cache.associativity)
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sysinfo_mem(3)(27 downto 24) <= (others => '0'); -- reserved (for d-cache.associativity)
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-- SYSINFO(5): Base address of data memory space --
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-- SYSINFO(5): Base address of data memory space --
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sysinfo_mem(5) <= dspace_base_c; -- defined in neorv32_package.vhd file
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sysinfo_mem(5) <= dspace_base_c; -- defined in neorv32_package.vhd file
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-- SYSINFO(6): Size of IMEM in bytes --
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-- SYSINFO(6): Size of IMEM in bytes --
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sysinfo_mem(6) <= std_ulogic_vector(to_unsigned(MEM_INT_IMEM_SIZE, 32)) when (MEM_INT_IMEM_USE = true) else (others => '0');
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sysinfo_mem(6) <= std_ulogic_vector(to_unsigned(MEM_INT_IMEM_SIZE, 32)) when (MEM_INT_IMEM_EN = true) else (others => '0');
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-- SYSINFO(7): Size of DMEM in bytes --
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-- SYSINFO(7): Size of DMEM in bytes --
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sysinfo_mem(7) <= std_ulogic_vector(to_unsigned(MEM_INT_DMEM_SIZE, 32)) when (MEM_INT_DMEM_USE = true) else (others => '0');
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sysinfo_mem(7) <= std_ulogic_vector(to_unsigned(MEM_INT_DMEM_SIZE, 32)) when (MEM_INT_DMEM_EN = true) else (others => '0');
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-- Read Access ----------------------------------------------------------------------------
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-- Read Access ----------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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read_access: process(clk_i)
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read_access: process(clk_i)
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