Subversion Repositories neorv32

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-- # << NEORV32 - Minimal setup with the bootloader enabled >>                                     #

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-- # Copyright (c) 2022, Stephan Nolting. All rights reserved.                                     #

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-- # 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;

entity neorv32_ProcessorTop_MinimalBoot is

  generic (

    CLOCK_FREQUENCY              : natural := 0;      -- clock frequency of clk_i in Hz

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

    HW_THREAD_ID                 : natural := 0;      -- hardware thread id (32-bit)

    -- RISC-V CPU Extensions --

    CPU_EXTENSION_RISCV_A        : boolean := true;   -- implement atomic extension?

    CPU_EXTENSION_RISCV_C        : boolean := true;   -- implement compressed extension?

    CPU_EXTENSION_RISCV_E        : boolean := false;  -- implement embedded RF extension?

    CPU_EXTENSION_RISCV_M        : boolean := true;   -- implement mul/div extension?

    CPU_EXTENSION_RISCV_U        : boolean := false;  -- implement user mode extension?

    CPU_EXTENSION_RISCV_Zfinx    : boolean := false;  -- implement 32-bit floating-point extension (using INT regs!)

    CPU_EXTENSION_RISCV_Zicsr    : boolean := true;   -- implement CSR system?

    CPU_EXTENSION_RISCV_Zifencei : boolean := false;  -- implement instruction stream sync.?

    -- Extension Options --

    FAST_MUL_EN                  : boolean := false;  -- use DSPs for M extension's multiplier

    FAST_SHIFT_EN                : boolean := false;  -- use barrel shifter for shift operations

    CPU_CNT_WIDTH                : natural := 34;     -- total width of CPU cycle and instret counters (0..64)

    -- Physical Memory Protection (PMP) --

    PMP_NUM_REGIONS              : natural := 0;       -- number of regions (0..16)

    PMP_MIN_GRANULARITY          : natural := 4;       -- minimal region granularity in bytes, has to be a power of 2, min 4 bytes

    -- Hardware Performance Monitors (HPM) --

    HPM_NUM_CNTS                 : natural := 0;       -- number of implemented HPM counters (0..29)

    HPM_CNT_WIDTH                : natural := 40;      -- total size of HPM counters (0..64)

    -- Internal Instruction memory --

    MEM_INT_IMEM_EN              : boolean := true;    -- implement processor-internal instruction memory

    MEM_INT_IMEM_SIZE            : natural := 64*1024; -- size of processor-internal instruction memory in bytes

    -- Internal Data memory --

    MEM_INT_DMEM_EN              : boolean := true;    -- implement processor-internal data memory

    MEM_INT_DMEM_SIZE            : natural := 64*1024; -- size of processor-internal data memory in bytes

    -- Internal Cache memory --

    ICACHE_EN                    : boolean := false;  -- implement instruction cache

    ICACHE_NUM_BLOCKS            : natural := 4;      -- i-cache: number of blocks (min 1), has to be a power of 2

    ICACHE_BLOCK_SIZE            : natural := 64;     -- i-cache: block size in bytes (min 4), has to be a power of 2

    ICACHE_ASSOCIATIVITY         : natural := 1;      -- i-cache: associativity / number of sets (1=direct_mapped), has to be a power of 2

    -- Processor peripherals --

    IO_GPIO_EN                   : boolean := true;   -- implement general purpose input/output port unit (GPIO)?

    IO_MTIME_EN                  : boolean := true;   -- implement machine system timer (MTIME)?

    IO_UART0_EN                  : boolean := true;   -- implement primary universal asynchronous receiver/transmitter (UART0)?

    IO_PWM_NUM_CH                : natural := 3;      -- number of PWM channels to implement (0..60); 0 = disabled

    IO_WDT_EN                    : boolean := true    -- implement watch dog timer (WDT)?

  );

  port (

    clk_i      : in  std_logic;

    rstn_i     : in  std_logic;

    -- GPIO (available if IO_GPIO_EN = true) --

    gpio_o     : out std_ulogic_vector(3 downto 0);

    -- primary UART0 (available if IO_UART0_EN = true) --

    uart_txd_o : out std_ulogic; -- UART0 send data

    uart_rxd_i : in  std_ulogic := '0'; -- UART0 receive data

    uart_rts_o : out std_ulogic; -- hw flow control: UART0.RX ready to receive ("RTR"), low-active, optional

    uart_cts_i : in  std_ulogic := '0'; -- hw flow control: UART0.TX allowed to transmit, low-active, optional

    -- PWM (available if IO_PWM_NUM_CH > 0) --

    pwm_o      : out std_ulogic_vector(IO_PWM_NUM_CH-1 downto 0)

  );

end entity;

architecture neorv32_ProcessorTop_MinimalBoot_rtl of neorv32_ProcessorTop_MinimalBoot is

  -- internal IO connection --

  signal con_gpio_o : std_ulogic_vector(63 downto 0);

  signal con_pwm_o  : std_ulogic_vector(59 downto 0);

begin

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

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

  -- GPIO --

  gpio_o <= con_gpio_o(3 downto 0);

  -- PWM --

  pwm_o <= con_pwm_o(IO_PWM_NUM_CH-1 downto 0);

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

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

  neorv32_inst: entity neorv32.neorv32_top

  generic map (

    -- General --

    CLOCK_FREQUENCY              => CLOCK_FREQUENCY,  -- clock frequency of clk_i in Hz

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

    HW_THREAD_ID                 => HW_THREAD_ID,     -- hardware thread id (32-bit)

    -- On-Chip Debugger (OCD) --

    ON_CHIP_DEBUGGER_EN          => false,  -- implement on-chip debugger?

    -- RISC-V CPU Extensions --

    CPU_EXTENSION_RISCV_A        => CPU_EXTENSION_RISCV_A,         -- implement atomic extension?

    CPU_EXTENSION_RISCV_C        => CPU_EXTENSION_RISCV_C,         -- implement compressed extension?

    CPU_EXTENSION_RISCV_E        => CPU_EXTENSION_RISCV_E,         -- implement embedded RF extension?

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

    CPU_EXTENSION_RISCV_U        => CPU_EXTENSION_RISCV_U,         -- implement user mode extension?

    CPU_EXTENSION_RISCV_Zfinx    => CPU_EXTENSION_RISCV_Zfinx,     -- implement 32-bit floating-point extension (using INT regs!)

    CPU_EXTENSION_RISCV_Zicsr    => CPU_EXTENSION_RISCV_Zicsr,     -- implement CSR system?

    CPU_EXTENSION_RISCV_Zicntr   => true,                          -- implement base counters?

    CPU_EXTENSION_RISCV_Zifencei => CPU_EXTENSION_RISCV_Zifencei,  -- implement instruction stream sync.?

    -- Extension Options --

    FAST_MUL_EN                  => FAST_MUL_EN,    -- use DSPs for M extension's multiplier

    FAST_SHIFT_EN                => FAST_SHIFT_EN,  -- use barrel shifter for shift operations

    CPU_CNT_WIDTH                => CPU_CNT_WIDTH,  -- total width of CPU cycle and instret counters (0..64)

    -- Physical Memory Protection (PMP) --

    PMP_NUM_REGIONS              => PMP_NUM_REGIONS,       -- number of regions (0..16)

    PMP_MIN_GRANULARITY          => PMP_MIN_GRANULARITY,   -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes

    -- Hardware Performance Monitors (HPM) --

    HPM_NUM_CNTS                 => HPM_NUM_CNTS,          -- number of implemented HPM counters (0..29)

    HPM_CNT_WIDTH                => HPM_CNT_WIDTH,         -- total size of HPM counters (1..64)

    -- Internal Instruction memory --

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

    MEM_INT_IMEM_SIZE            => MEM_INT_IMEM_SIZE,     -- size of processor-internal instruction memory in bytes

    -- Internal Data memory --

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

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

    -- Internal Cache memory --

    ICACHE_EN                    => ICACHE_EN,             -- implement instruction cache

    ICACHE_NUM_BLOCKS            => ICACHE_NUM_BLOCKS,     -- i-cache: number of blocks (min 1), has to be a power of 2

    ICACHE_BLOCK_SIZE            => ICACHE_BLOCK_SIZE,     -- i-cache: block size in bytes (min 4), has to be a power of 2

    ICACHE_ASSOCIATIVITY         => ICACHE_ASSOCIATIVITY,  -- i-cache: associativity / number of sets (1=direct_mapped), has to be a power of 2

    -- External memory interface --

    MEM_EXT_EN                   => false,       -- implement external memory bus interface?

    MEM_EXT_TIMEOUT              => 0,           -- cycles after a pending bus access auto-terminates (0 = disabled)

    -- Processor peripherals --

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

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

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

    IO_UART1_EN                  => false,         -- implement secondary universal asynchronous receiver/transmitter (UART1)?

    IO_SPI_EN                    => false,         -- implement serial peripheral interface (SPI)?

    IO_TWI_EN                    => false,         -- implement two-wire interface (TWI)?

    IO_PWM_NUM_CH                => IO_PWM_NUM_CH, -- number of PWM channels to implement (0..60); 0 = disabled

    IO_WDT_EN                    => IO_WDT_EN,     -- implement watch dog timer (WDT)?

    IO_TRNG_EN                   => false,         -- implement true random number generator (TRNG)?

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

    IO_CFS_CONFIG                => x"00000000",   -- custom CFS configuration generic

    IO_CFS_IN_SIZE               => 32,            -- size of CFS input conduit in bits

    IO_CFS_OUT_SIZE              => 32,            -- size of CFS output conduit in bits

    IO_NEOLED_EN                 => false          -- implement NeoPixel-compatible smart LED interface (NEOLED)?

  )

  port map (

    -- Global control --

    clk_i       => clk_i,                        -- global clock, rising edge

    rstn_i      => rstn_i,                       -- global reset, low-active, async

    -- JTAG on-chip debugger interface (available if ON_CHIP_DEBUGGER_EN = true) --

    jtag_trst_i => '0',                          -- low-active TAP reset (optional)

    jtag_tck_i  => '0',                          -- serial clock

    jtag_tdi_i  => '0',                          -- serial data input

    jtag_tdo_o  => open,                         -- serial data output

    jtag_tms_i  => '0',                          -- mode select

    -- Wishbone bus interface (available if MEM_EXT_EN = true) --

    wb_tag_o    => open,                         -- request tag

    wb_adr_o    => open,                         -- address

    wb_dat_i    => (others => '0'),              -- read data

    wb_dat_o    => open,                         -- write data

    wb_we_o     => open,                         -- read/write

    wb_sel_o    => open,                         -- byte enable

    wb_stb_o    => open,                         -- strobe

    wb_cyc_o    => open,                         -- valid cycle

    wb_lock_o   => open,                         -- exclusive access request

    wb_ack_i    => '0',                          -- transfer acknowledge

    wb_err_i    => '0',                          -- transfer error

    -- Advanced memory control signals (available if MEM_EXT_EN = true) --

    fence_o     => open,                         -- indicates an executed FENCE operation

    fencei_o    => open,                         -- indicates an executed FENCEI operation

    -- GPIO (available if IO_GPIO_EN = true) --

    gpio_o      => con_gpio_o,                   -- parallel output

    gpio_i      => (others => '0'),              -- parallel input

    -- primary UART0 (available if IO_UART0_EN = true) --

    uart0_txd_o => uart_txd_o,                   -- UART0 send data

    uart0_rxd_i => uart_rxd_i,                   -- UART0 receive data

    uart0_rts_o => uart_rts_o,                   -- hw flow control: UART0.RX ready to receive ("RTR"), low-active, optional

    uart0_cts_i => uart_cts_i,                   -- hw flow control: UART0.TX allowed to transmit, low-active, optional

    -- secondary UART1 (available if IO_UART1_EN = true) --

    uart1_txd_o => open,                         -- UART1 send data

    uart1_rxd_i => '0',                          -- UART1 receive data

    uart1_rts_o => open,                         -- hw flow control: UART1.RX ready to receive ("RTR"), low-active, optional

    uart1_cts_i => '0',                          -- hw flow control: UART1.TX allowed to transmit, low-active, optional

    -- SPI (available if IO_SPI_EN = true) --

    spi_sck_o   => open,                         -- SPI serial clock

    spi_sdo_o   => open,                         -- controller data out, peripheral data in

    spi_sdi_i   => '0',                          -- controller data in, peripheral data out

    spi_csn_o   => open,                         -- SPI CS

    -- TWI (available if IO_TWI_EN = true) --

    twi_sda_io  => open,                         -- twi serial data line

    twi_scl_io  => open,                         -- twi serial clock line

    -- PWM (available if IO_PWM_NUM_CH > 0) --

    pwm_o       => con_pwm_o,                    -- pwm channels

    -- Custom Functions Subsystem IO --

    cfs_in_i    => (others => '0'),              -- custom CFS inputs conduit

    cfs_out_o   => open,                         -- custom CFS outputs conduit

    -- NeoPixel-compatible smart LED interface (available if IO_NEOLED_EN = true) --

    neoled_o    => open,                         -- async serial data line

    -- System time --

    mtime_i     => (others => '0'),              -- current system time from ext. MTIME (if IO_MTIME_EN = false)

    mtime_o     => open,                         -- current system time from int. MTIME (if IO_MTIME_EN = true)

    -- Interrupts --

    mtime_irq_i => '0',                          -- machine timer interrupt, available if IO_MTIME_EN = false

    msw_irq_i   => '0',                          -- machine software interrupt

    mext_irq_i  => '0'                           -- machine external interrupt

  );

end architecture;