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-- ################################################################################################# -- # << NEORV32 - Main VHDL package file >> # -- # ********************************************************************************************* # -- # 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; package neorv32_package is -- Architecture Configuration ------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- address space -- constant ispace_base_c : std_ulogic_vector(31 downto 0) := x"00000000"; -- default instruction memory address space base address constant dspace_base_c : std_ulogic_vector(31 downto 0) := x"80000000"; -- default data memory address space base address -- (external) bus interface -- constant bus_timeout_c : natural := 127; -- cycles after which an *unacknowledged* bus access will timeout and trigger a bus access exception (min 3) constant wb_pipe_mode_c : boolean := false; -- *external* bus protocol: false=classic/standard wishbone mode (default), true=pipelined wishbone mode constant xbus_big_endian_c : boolean := true; -- external memory access byte order: true=big endian (default); false=little endian -- CPU core -- constant ipb_entries_c : natural := 2; -- entries in CPU instruction prefetch buffer, must be a power of 2, default=2 constant zicnt_en_c : boolean := true; -- enable RISC-V performance counters ([m]cycle[h], [m]instret[h]), default=true -- physical memory protection (PMP) -- constant pmp_num_regions_c : natural := 2; -- number of regions (1..8) constant pmp_min_granularity_c : natural := 64*1024; -- minimal region size (granularity), min 8 bytes, has to be a power of 2 -- Architecture Constants (do not modify!)= ----------------------------------------------- -- ------------------------------------------------------------------------------------------- constant data_width_c : natural := 32; -- data width - do not change! constant hw_version_c : std_ulogic_vector(31 downto 0) := x"01040900"; -- no touchy! constant pmp_max_r_c : natural := 8; -- max PMP regions - FIXED! constant archid_c : natural := 19; -- official NEORV32 architecture ID - hands off! constant rf_r0_is_reg_c : boolean := true; -- reg_file.r0 is a physical register that has to be initialized to zero by the HW -- Helper Functions ----------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- function index_size_f(input : natural) return natural; function cond_sel_natural_f(cond : boolean; val_t : natural; val_f : natural) return natural; function cond_sel_stdulogicvector_f(cond : boolean; val_t : std_ulogic_vector; val_f : std_ulogic_vector) return std_ulogic_vector; function bool_to_ulogic_f(cond : boolean) return std_ulogic; function or_all_f(a : std_ulogic_vector) return std_ulogic; function and_all_f(a : std_ulogic_vector) return std_ulogic; function xor_all_f(a : std_ulogic_vector) return std_ulogic; function xnor_all_f(a : std_ulogic_vector) return std_ulogic; function to_hexchar_f(input : std_ulogic_vector(3 downto 0)) return character; function hexchar_to_stdulogicvector_f(input : character) return std_ulogic_vector; function bit_rev_f(input : std_ulogic_vector) return std_ulogic_vector; function is_power_of_two_f(input : natural) return boolean; function bswap32_f(input : std_ulogic_vector) return std_ulogic_vector; -- Internal Types ------------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- type pmp_ctrl_if_t is array (0 to pmp_max_r_c-1) of std_ulogic_vector(7 downto 0); type pmp_addr_if_t is array (0 to pmp_max_r_c-1) of std_ulogic_vector(33 downto 0); -- Processor-Internal Address Space Layout ------------------------------------------------ -- ------------------------------------------------------------------------------------------- -- Internal Instruction Memory (IMEM) and Date Memory (DMEM) -- constant imem_base_c : std_ulogic_vector(data_width_c-1 downto 0) := ispace_base_c; -- internal instruction memory base address constant dmem_base_c : std_ulogic_vector(data_width_c-1 downto 0) := dspace_base_c; -- internal data memory base address --> memory sizes are configured via top's generics -- Internal Bootloader ROM -- constant boot_rom_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFF0000"; -- bootloader base address, fixed! constant boot_rom_size_c : natural := 4*1024; -- bytes constant boot_rom_max_size_c : natural := 32*1024; -- bytes, fixed! -- IO: Peripheral Devices ("IO") Area -- -- Control register(s) (including the device-enable) should be located at the base address of each device constant io_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF80"; constant io_size_c : natural := 32*4; -- bytes, fixed! -- General Purpose Input/Output Unit (GPIO) -- constant gpio_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF80"; -- base address, fixed! constant gpio_size_c : natural := 2*4; -- bytes constant gpio_in_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF80"; constant gpio_out_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF84"; -- True Random Number Generator (TRNG) -- constant trng_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF88"; -- base address, fixed! constant trng_size_c : natural := 1*4; -- bytes constant trng_ctrl_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF88"; -- Watch Dog Timer (WDT) -- constant wdt_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF8C"; -- base address, fixed! constant wdt_size_c : natural := 1*4; -- bytes constant wdt_ctrl_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF8C"; -- Machine System Timer (MTIME) -- constant mtime_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF90"; -- base address, fixed! constant mtime_size_c : natural := 4*4; -- bytes constant mtime_time_lo_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF90"; constant mtime_time_hi_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF94"; constant mtime_cmp_lo_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF98"; constant mtime_cmp_hi_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFF9C"; -- Universal Asynchronous Receiver/Transmitter (UART) -- constant uart_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFA0"; -- base address, fixed! constant uart_size_c : natural := 2*4; -- bytes constant uart_ctrl_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFA0"; constant uart_rtx_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFA4"; -- Serial Peripheral Interface (SPI) -- constant spi_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFA8"; -- base address, fixed! constant spi_size_c : natural := 2*4; -- bytes constant spi_ctrl_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFA8"; constant spi_rtx_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFAC"; -- Two Wire Interface (TWI) -- constant twi_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFB0"; -- base address, fixed! constant twi_size_c : natural := 2*4; -- bytes constant twi_ctrl_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFB0"; constant twi_rtx_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFB4"; -- Pulse-Width Modulation Controller (PWM) -- constant pwm_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFB8"; -- base address, fixed! constant pwm_size_c : natural := 2*4; -- bytes constant pwm_ctrl_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFB8"; constant pwm_duty_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFBC"; -- Custom Functions Unit 0 (CFU0) -- constant cfu0_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFC0"; -- base address, fixed! constant cfu0_size_c : natural := 4*4; -- bytes constant cfu0_reg0_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFC0"; constant cfu0_reg1_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFC4"; constant cfu0_reg2_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFC8"; constant cfu0_reg3_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFCC"; -- Custom Functions Unit 1 (CFU1) -- constant cfu1_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFD0"; -- base address, fixed! constant cfu1_size_c : natural := 4*4; -- bytes constant cfu1_reg0_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFD0"; constant cfu1_reg1_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFD4"; constant cfu1_reg2_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFD8"; constant cfu1_reg3_addr_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFDC"; -- System Information Memory (SYSINFO) -- constant sysinfo_base_c : std_ulogic_vector(data_width_c-1 downto 0) := x"FFFFFFE0"; -- base address, fixed! constant sysinfo_size_c : natural := 8*4; -- bytes -- Main Control Bus ----------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- register file -- constant ctrl_rf_in_mux_lsb_c : natural := 0; -- input source select lsb (10=MEM, 11=CSR) constant ctrl_rf_in_mux_msb_c : natural := 1; -- input source select msb (0-=ALU) constant ctrl_rf_rs1_adr0_c : natural := 2; -- source register 1 address bit 0 constant ctrl_rf_rs1_adr1_c : natural := 3; -- source register 1 address bit 1 constant ctrl_rf_rs1_adr2_c : natural := 4; -- source register 1 address bit 2 constant ctrl_rf_rs1_adr3_c : natural := 5; -- source register 1 address bit 3 constant ctrl_rf_rs1_adr4_c : natural := 6; -- source register 1 address bit 4 constant ctrl_rf_rs2_adr0_c : natural := 7; -- source register 2 address bit 0 constant ctrl_rf_rs2_adr1_c : natural := 8; -- source register 2 address bit 1 constant ctrl_rf_rs2_adr2_c : natural := 9; -- source register 2 address bit 2 constant ctrl_rf_rs2_adr3_c : natural := 10; -- source register 2 address bit 3 constant ctrl_rf_rs2_adr4_c : natural := 11; -- source register 2 address bit 4 constant ctrl_rf_rd_adr0_c : natural := 12; -- destiantion register address bit 0 constant ctrl_rf_rd_adr1_c : natural := 13; -- destiantion register address bit 1 constant ctrl_rf_rd_adr2_c : natural := 14; -- destiantion register address bit 2 constant ctrl_rf_rd_adr3_c : natural := 15; -- destiantion register address bit 3 constant ctrl_rf_rd_adr4_c : natural := 16; -- destiantion register address bit 4 constant ctrl_rf_wb_en_c : natural := 17; -- write back enable constant ctrl_rf_r0_we_c : natural := 18; -- force write access and force rd=r0 -- alu -- constant ctrl_alu_arith_c : natural := 19; -- ALU arithmetic command constant ctrl_alu_logic0_c : natural := 20; -- ALU logic command bit 0 constant ctrl_alu_logic1_c : natural := 21; -- ALU logic command bit 1 constant ctrl_alu_func0_c : natural := 22; -- ALU function select command bit 0 constant ctrl_alu_func1_c : natural := 23; -- ALU function select command bit 1 constant ctrl_alu_addsub_c : natural := 24; -- 0=ADD, 1=SUB constant ctrl_alu_opa_mux_c : natural := 25; -- operand A select (0=rs1, 1=PC) constant ctrl_alu_opb_mux_c : natural := 26; -- operand B select (0=rs2, 1=IMM) constant ctrl_alu_unsigned_c : natural := 27; -- is unsigned ALU operation constant ctrl_alu_shift_dir_c : natural := 28; -- shift direction (0=left, 1=right) constant ctrl_alu_shift_ar_c : natural := 29; -- is arithmetic shift -- bus interface -- constant ctrl_bus_size_lsb_c : natural := 30; -- transfer size lsb (00=byte, 01=half-word) constant ctrl_bus_size_msb_c : natural := 31; -- transfer size msb (10=word, 11=?) constant ctrl_bus_rd_c : natural := 32; -- read data request constant ctrl_bus_wr_c : natural := 33; -- write data request constant ctrl_bus_if_c : natural := 34; -- instruction fetch request constant ctrl_bus_mo_we_c : natural := 35; -- memory address and data output register write enable constant ctrl_bus_mi_we_c : natural := 36; -- memory data input register write enable constant ctrl_bus_unsigned_c : natural := 37; -- is unsigned load constant ctrl_bus_ierr_ack_c : natural := 38; -- acknowledge instruction fetch bus exceptions constant ctrl_bus_derr_ack_c : natural := 39; -- acknowledge data access bus exceptions constant ctrl_bus_fence_c : natural := 40; -- executed fence operation constant ctrl_bus_fencei_c : natural := 41; -- executed fencei operation constant ctrl_bus_lock_c : natural := 42; -- locked/exclusive bus access -- co-processors -- constant ctrl_cp_id_lsb_c : natural := 43; -- cp select ID lsb constant ctrl_cp_id_msb_c : natural := 44; -- cp select ID msb -- current privilege level -- constant ctrl_priv_lvl_lsb_c : natural := 45; -- privilege level lsb constant ctrl_priv_lvl_msb_c : natural := 46; -- privilege level msb -- instruction's control blocks -- constant ctrl_ir_funct3_0_c : natural := 47; -- funct3 bit 0 constant ctrl_ir_funct3_1_c : natural := 48; -- funct3 bit 1 constant ctrl_ir_funct3_2_c : natural := 49; -- funct3 bit 2 constant ctrl_ir_funct12_0_c : natural := 50; -- funct12 bit 0 constant ctrl_ir_funct12_1_c : natural := 51; -- funct12 bit 1 constant ctrl_ir_funct12_2_c : natural := 52; -- funct12 bit 2 constant ctrl_ir_funct12_3_c : natural := 53; -- funct12 bit 3 constant ctrl_ir_funct12_4_c : natural := 54; -- funct12 bit 4 constant ctrl_ir_funct12_5_c : natural := 55; -- funct12 bit 5 constant ctrl_ir_funct12_6_c : natural := 56; -- funct12 bit 6 constant ctrl_ir_funct12_7_c : natural := 57; -- funct12 bit 7 constant ctrl_ir_funct12_8_c : natural := 58; -- funct12 bit 8 constant ctrl_ir_funct12_9_c : natural := 59; -- funct12 bit 9 constant ctrl_ir_funct12_10_c : natural := 60; -- funct12 bit 10 constant ctrl_ir_funct12_11_c : natural := 61; -- funct12 bit 11 -- control bus size -- constant ctrl_width_c : natural := 62; -- control bus size -- ALU Comparator Bus --------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- constant alu_cmp_equal_c : natural := 0; constant alu_cmp_less_c : natural := 1; -- for signed and unsigned comparisons -- RISC-V Opcode Layout ------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- constant instr_opcode_lsb_c : natural := 0; -- opcode bit 0 constant instr_opcode_msb_c : natural := 6; -- opcode bit 6 constant instr_rd_lsb_c : natural := 7; -- destination register address bit 0 constant instr_rd_msb_c : natural := 11; -- destination register address bit 4 constant instr_funct3_lsb_c : natural := 12; -- funct3 bit 0 constant instr_funct3_msb_c : natural := 14; -- funct3 bit 2 constant instr_rs1_lsb_c : natural := 15; -- source register 1 address bit 0 constant instr_rs1_msb_c : natural := 19; -- source register 1 address bit 4 constant instr_rs2_lsb_c : natural := 20; -- source register 2 address bit 0 constant instr_rs2_msb_c : natural := 24; -- source register 2 address bit 4 constant instr_funct7_lsb_c : natural := 25; -- funct7 bit 0 constant instr_funct7_msb_c : natural := 31; -- funct7 bit 6 constant instr_funct12_lsb_c : natural := 20; -- funct12 bit 0 constant instr_funct12_msb_c : natural := 31; -- funct12 bit 11 constant instr_imm12_lsb_c : natural := 20; -- immediate12 bit 0 constant instr_imm12_msb_c : natural := 31; -- immediate12 bit 11 constant instr_imm20_lsb_c : natural := 12; -- immediate20 bit 0 constant instr_imm20_msb_c : natural := 31; -- immediate20 bit 21 constant instr_csr_id_lsb_c : natural := 20; -- csr select bit 0 constant instr_csr_id_msb_c : natural := 31; -- csr select bit 11 constant instr_funct5_lsb_c : natural := 27; -- funct5 select bit 0 constant instr_funct5_msb_c : natural := 31; -- funct5 select bit 4 -- RISC-V Opcodes ------------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- alu -- constant opcode_lui_c : std_ulogic_vector(6 downto 0) := "0110111"; -- load upper immediate constant opcode_auipc_c : std_ulogic_vector(6 downto 0) := "0010111"; -- add upper immediate to PC constant opcode_alui_c : std_ulogic_vector(6 downto 0) := "0010011"; -- ALU operation with immediate (operation via funct3 and funct7) constant opcode_alu_c : std_ulogic_vector(6 downto 0) := "0110011"; -- ALU operation (operation via funct3 and funct7) -- control flow -- constant opcode_jal_c : std_ulogic_vector(6 downto 0) := "1101111"; -- jump and link constant opcode_jalr_c : std_ulogic_vector(6 downto 0) := "1100111"; -- jump and link with register constant opcode_branch_c : std_ulogic_vector(6 downto 0) := "1100011"; -- branch (condition set via funct3) -- memory access -- constant opcode_load_c : std_ulogic_vector(6 downto 0) := "0000011"; -- load (data type via funct3) constant opcode_store_c : std_ulogic_vector(6 downto 0) := "0100011"; -- store (data type via funct3) -- system/csr -- constant opcode_fence_c : std_ulogic_vector(6 downto 0) := "0001111"; -- fence / fence.i constant opcode_syscsr_c : std_ulogic_vector(6 downto 0) := "1110011"; -- system/csr access (type via funct3) -- atomic operations (A) -- constant opcode_atomic_c : std_ulogic_vector(6 downto 0) := "0101111"; -- atomic operations (A extension) -- RISC-V Funct3 -------------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- control flow -- constant funct3_beq_c : std_ulogic_vector(2 downto 0) := "000"; -- branch if equal constant funct3_bne_c : std_ulogic_vector(2 downto 0) := "001"; -- branch if not equal constant funct3_blt_c : std_ulogic_vector(2 downto 0) := "100"; -- branch if less than constant funct3_bge_c : std_ulogic_vector(2 downto 0) := "101"; -- branch if greater than or equal constant funct3_bltu_c : std_ulogic_vector(2 downto 0) := "110"; -- branch if less than (unsigned) constant funct3_bgeu_c : std_ulogic_vector(2 downto 0) := "111"; -- branch if greater than or equal (unsigned) -- memory access -- constant funct3_lb_c : std_ulogic_vector(2 downto 0) := "000"; -- load byte constant funct3_lh_c : std_ulogic_vector(2 downto 0) := "001"; -- load half word constant funct3_lw_c : std_ulogic_vector(2 downto 0) := "010"; -- load word constant funct3_lbu_c : std_ulogic_vector(2 downto 0) := "100"; -- load byte (unsigned) constant funct3_lhu_c : std_ulogic_vector(2 downto 0) := "101"; -- load half word (unsigned) constant funct3_sb_c : std_ulogic_vector(2 downto 0) := "000"; -- store byte constant funct3_sh_c : std_ulogic_vector(2 downto 0) := "001"; -- store half word constant funct3_sw_c : std_ulogic_vector(2 downto 0) := "010"; -- store word -- alu -- constant funct3_subadd_c : std_ulogic_vector(2 downto 0) := "000"; -- sub/add via funct7 constant funct3_sll_c : std_ulogic_vector(2 downto 0) := "001"; -- shift logical left constant funct3_slt_c : std_ulogic_vector(2 downto 0) := "010"; -- set on less constant funct3_sltu_c : std_ulogic_vector(2 downto 0) := "011"; -- set on less unsigned constant funct3_xor_c : std_ulogic_vector(2 downto 0) := "100"; -- xor constant funct3_sr_c : std_ulogic_vector(2 downto 0) := "101"; -- shift right via funct7 constant funct3_or_c : std_ulogic_vector(2 downto 0) := "110"; -- or constant funct3_and_c : std_ulogic_vector(2 downto 0) := "111"; -- and -- system/csr -- constant funct3_env_c : std_ulogic_vector(2 downto 0) := "000"; -- ecall, ebreak, mret, wfi constant funct3_csrrw_c : std_ulogic_vector(2 downto 0) := "001"; -- atomic r/w constant funct3_csrrs_c : std_ulogic_vector(2 downto 0) := "010"; -- atomic read & set bit constant funct3_csrrc_c : std_ulogic_vector(2 downto 0) := "011"; -- atomic read & clear bit -- constant funct3_csrrwi_c : std_ulogic_vector(2 downto 0) := "101"; -- atomic r/w immediate constant funct3_csrrsi_c : std_ulogic_vector(2 downto 0) := "110"; -- atomic read & set bit immediate constant funct3_csrrci_c : std_ulogic_vector(2 downto 0) := "111"; -- atomic read & clear bit immediate -- fence -- constant funct3_fence_c : std_ulogic_vector(2 downto 0) := "000"; -- fence - order IO/memory access (->NOP) constant funct3_fencei_c : std_ulogic_vector(2 downto 0) := "001"; -- fencei - instructon stream sync -- RISC-V Funct12 ------------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- system -- constant funct12_ecall_c : std_ulogic_vector(11 downto 0) := x"000"; -- ECALL constant funct12_ebreak_c : std_ulogic_vector(11 downto 0) := x"001"; -- EBREAK constant funct12_mret_c : std_ulogic_vector(11 downto 0) := x"302"; -- MRET constant funct12_wfi_c : std_ulogic_vector(11 downto 0) := x"105"; -- WFI -- RISC-V Funct5 -------------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- atomic operations -- constant funct5_a_lr_c : std_ulogic_vector(4 downto 0) := "00010"; -- LR constant funct5_a_sc_c : std_ulogic_vector(4 downto 0) := "00011"; -- SC -- RISC-V CSR Addresses ------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- constant csr_mstatus_c : std_ulogic_vector(11 downto 0) := x"300"; -- mstatus constant csr_misa_c : std_ulogic_vector(11 downto 0) := x"301"; -- misa constant csr_mie_c : std_ulogic_vector(11 downto 0) := x"304"; -- mie constant csr_mtvec_c : std_ulogic_vector(11 downto 0) := x"305"; -- mtvec constant csr_mstatush_c : std_ulogic_vector(11 downto 0) := x"310"; -- mstatush -- constant csr_mscratch_c : std_ulogic_vector(11 downto 0) := x"340"; -- mscratch constant csr_mepc_c : std_ulogic_vector(11 downto 0) := x"341"; -- mepc constant csr_mcause_c : std_ulogic_vector(11 downto 0) := x"342"; -- mcause constant csr_mtval_c : std_ulogic_vector(11 downto 0) := x"343"; -- mtval constant csr_mip_c : std_ulogic_vector(11 downto 0) := x"344"; -- mip -- constant csr_pmpcfg0_c : std_ulogic_vector(11 downto 0) := x"3a0"; -- pmpcfg0 constant csr_pmpcfg1_c : std_ulogic_vector(11 downto 0) := x"3a1"; -- pmpcfg1 -- constant csr_pmpaddr0_c : std_ulogic_vector(11 downto 0) := x"3b0"; -- pmpaddr0 constant csr_pmpaddr1_c : std_ulogic_vector(11 downto 0) := x"3b1"; -- pmpaddr1 constant csr_pmpaddr2_c : std_ulogic_vector(11 downto 0) := x"3b2"; -- pmpaddr2 constant csr_pmpaddr3_c : std_ulogic_vector(11 downto 0) := x"3b3"; -- pmpaddr3 constant csr_pmpaddr4_c : std_ulogic_vector(11 downto 0) := x"3b4"; -- pmpaddr4 constant csr_pmpaddr5_c : std_ulogic_vector(11 downto 0) := x"3b5"; -- pmpaddr5 constant csr_pmpaddr6_c : std_ulogic_vector(11 downto 0) := x"3b6"; -- pmpaddr6 constant csr_pmpaddr7_c : std_ulogic_vector(11 downto 0) := x"3b7"; -- pmpaddr7 -- constant csr_mcycle_c : std_ulogic_vector(11 downto 0) := x"b00"; -- mcycle constant csr_minstret_c : std_ulogic_vector(11 downto 0) := x"b02"; -- minstret -- constant csr_mcycleh_c : std_ulogic_vector(11 downto 0) := x"b80"; -- mcycleh constant csr_minstreth_c : std_ulogic_vector(11 downto 0) := x"b82"; -- minstreth -- constant csr_cycle_c : std_ulogic_vector(11 downto 0) := x"c00"; -- cycle constant csr_time_c : std_ulogic_vector(11 downto 0) := x"c01"; -- time constant csr_instret_c : std_ulogic_vector(11 downto 0) := x"c02"; -- instret -- constant csr_cycleh_c : std_ulogic_vector(11 downto 0) := x"c80"; -- cycleh constant csr_timeh_c : std_ulogic_vector(11 downto 0) := x"c81"; -- timeh constant csr_instreth_c : std_ulogic_vector(11 downto 0) := x"c82"; -- instreth -- constant csr_mvendorid_c : std_ulogic_vector(11 downto 0) := x"f11"; -- mvendorid constant csr_marchid_c : std_ulogic_vector(11 downto 0) := x"f12"; -- marchid constant csr_mimpid_c : std_ulogic_vector(11 downto 0) := x"f13"; -- mimpid constant csr_mhartid_c : std_ulogic_vector(11 downto 0) := x"f14"; -- mhartid -- constant csr_mzext_c : std_ulogic_vector(11 downto 0) := x"fc0"; -- mzext (neorv32-custom) -- Co-Processor Operations ---------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- cp ids -- constant cp_sel_muldiv_c : std_ulogic_vector(1 downto 0) := "00"; -- MULDIV constant cp_sel_atomic_c : std_ulogic_vector(1 downto 0) := "01"; -- atomic operations success/failure evaluation --constant cp_sel_reserv_c : std_ulogic_vector(1 downto 0) := "10"; -- reserved --constant cp_sel_reserv_c : std_ulogic_vector(1 downto 0) := "11"; -- reserved -- muldiv cp -- constant cp_op_mul_c : std_ulogic_vector(2 downto 0) := "000"; -- mul constant cp_op_mulh_c : std_ulogic_vector(2 downto 0) := "001"; -- mulh constant cp_op_mulhsu_c : std_ulogic_vector(2 downto 0) := "010"; -- mulhsu constant cp_op_mulhu_c : std_ulogic_vector(2 downto 0) := "011"; -- mulhu constant cp_op_div_c : std_ulogic_vector(2 downto 0) := "100"; -- div constant cp_op_divu_c : std_ulogic_vector(2 downto 0) := "101"; -- divu constant cp_op_rem_c : std_ulogic_vector(2 downto 0) := "110"; -- rem constant cp_op_remu_c : std_ulogic_vector(2 downto 0) := "111"; -- remu -- ALU Function Codes --------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- arithmetic core -- constant alu_arith_cmd_addsub_c : std_ulogic := '0'; -- r.arith <= A +/- B constant alu_arith_cmd_slt_c : std_ulogic := '1'; -- r.arith <= A < B -- logic core -- constant alu_logic_cmd_movb_c : std_ulogic_vector(1 downto 0) := "00"; -- r.logic <= B constant alu_logic_cmd_xor_c : std_ulogic_vector(1 downto 0) := "01"; -- r.logic <= A xor B constant alu_logic_cmd_or_c : std_ulogic_vector(1 downto 0) := "10"; -- r.logic <= A or B constant alu_logic_cmd_and_c : std_ulogic_vector(1 downto 0) := "11"; -- r.logic <= A and B -- function select (actual alu result) -- constant alu_func_cmd_arith_c : std_ulogic_vector(1 downto 0) := "00"; -- r <= r.arith constant alu_func_cmd_logic_c : std_ulogic_vector(1 downto 0) := "01"; -- r <= r.logic constant alu_func_cmd_shift_c : std_ulogic_vector(1 downto 0) := "10"; -- r <= A <</>> B (iterative) constant alu_func_cmd_copro_c : std_ulogic_vector(1 downto 0) := "11"; -- r <= CP result (iterative) -- Trap ID Codes -------------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- RISC-V compliant exceptions -- constant trap_ima_c : std_ulogic_vector(5 downto 0) := "0" & "00000"; -- 0.0: instruction misaligned constant trap_iba_c : std_ulogic_vector(5 downto 0) := "0" & "00001"; -- 0.1: instruction access fault constant trap_iil_c : std_ulogic_vector(5 downto 0) := "0" & "00010"; -- 0.2: illegal instruction constant trap_brk_c : std_ulogic_vector(5 downto 0) := "0" & "00011"; -- 0.3: breakpoint constant trap_lma_c : std_ulogic_vector(5 downto 0) := "0" & "00100"; -- 0.4: load address misaligned constant trap_lbe_c : std_ulogic_vector(5 downto 0) := "0" & "00101"; -- 0.5: load access fault constant trap_sma_c : std_ulogic_vector(5 downto 0) := "0" & "00110"; -- 0.6: store address misaligned constant trap_sbe_c : std_ulogic_vector(5 downto 0) := "0" & "00111"; -- 0.7: store access fault constant trap_uenv_c : std_ulogic_vector(5 downto 0) := "0" & "01000"; -- 0.8: environment call from u-mode constant trap_menv_c : std_ulogic_vector(5 downto 0) := "0" & "01011"; -- 0.11: environment call from m-mode -- RISC-V compliant interrupts -- constant trap_msi_c : std_ulogic_vector(5 downto 0) := "1" & "00011"; -- 1.3: machine software interrupt constant trap_mti_c : std_ulogic_vector(5 downto 0) := "1" & "00111"; -- 1.7: machine timer interrupt constant trap_mei_c : std_ulogic_vector(5 downto 0) := "1" & "01011"; -- 1.11: machine external interrupt -- NEORV32-specific (custom) interrupts -- constant trap_reset_c : std_ulogic_vector(5 downto 0) := "1" & "00000"; -- 1.0: hardware reset constant trap_firq0_c : std_ulogic_vector(5 downto 0) := "1" & "10000"; -- 1.16: fast interrupt 0 constant trap_firq1_c : std_ulogic_vector(5 downto 0) := "1" & "10001"; -- 1.17: fast interrupt 1 constant trap_firq2_c : std_ulogic_vector(5 downto 0) := "1" & "10010"; -- 1.18: fast interrupt 2 constant trap_firq3_c : std_ulogic_vector(5 downto 0) := "1" & "10011"; -- 1.19: fast interrupt 3 -- CPU Control Exception System ----------------------------------------------------------- -- ------------------------------------------------------------------------------------------- -- exception source bits -- constant exception_iaccess_c : natural := 0; -- instrution access fault constant exception_iillegal_c : natural := 1; -- illegal instrution constant exception_ialign_c : natural := 2; -- instrution address misaligned constant exception_m_envcall_c : natural := 3; -- ENV call from m-mode constant exception_u_envcall_c : natural := 4; -- ENV call from u-mode constant exception_break_c : natural := 5; -- breakpoint constant exception_salign_c : natural := 6; -- store address misaligned constant exception_lalign_c : natural := 7; -- load address misaligned constant exception_saccess_c : natural := 8; -- store access fault constant exception_laccess_c : natural := 9; -- load access fault -- constant exception_width_c : natural := 10; -- length of this list in bits -- interrupt source bits -- constant interrupt_msw_irq_c : natural := 0; -- machine software interrupt constant interrupt_mtime_irq_c : natural := 1; -- machine timer interrupt constant interrupt_mext_irq_c : natural := 2; -- machine external interrupt constant interrupt_firq_0_c : natural := 3; -- fast interrupt channel 0 constant interrupt_firq_1_c : natural := 4; -- fast interrupt channel 1 constant interrupt_firq_2_c : natural := 5; -- fast interrupt channel 2 constant interrupt_firq_3_c : natural := 6; -- fast interrupt channel 3 -- constant interrupt_width_c : natural := 7; -- length of this list in bits -- CPU Privilege Modes -------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- constant priv_mode_m_c : std_ulogic_vector(1 downto 0) := "11"; -- machine mode constant priv_mode_u_c : std_ulogic_vector(1 downto 0) := "00"; -- user mode -- Clock Generator ------------------------------------------------------------------------ -- ------------------------------------------------------------------------------------------- constant clk_div2_c : natural := 0; constant clk_div4_c : natural := 1; constant clk_div8_c : natural := 2; constant clk_div64_c : natural := 3; constant clk_div128_c : natural := 4; constant clk_div1024_c : natural := 5; constant clk_div2048_c : natural := 6; constant clk_div4096_c : natural := 7; -- Component: NEORV32 Processor Top Entity ------------------------------------------------ -- ------------------------------------------------------------------------------------------- component neorv32_top 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 HW_THREAD_ID : std_ulogic_vector(31 downto 0) := (others => '0'); -- hardware thread id (hartid) -- RISC-V CPU Extensions -- CPU_EXTENSION_RISCV_A : boolean := false; -- implement atomic extension? CPU_EXTENSION_RISCV_C : boolean := false; -- implement compressed extension? CPU_EXTENSION_RISCV_E : boolean := false; -- implement embedded RF extension? CPU_EXTENSION_RISCV_M : boolean := false; -- implement muld/div extension? CPU_EXTENSION_RISCV_U : boolean := false; -- implement user mode extension? 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 -- Physical Memory Protection (PMP) -- PMP_USE : boolean := false; -- implement PMP? -- Internal Instruction memory -- MEM_INT_IMEM_USE : boolean := true; -- implement processor-internal instruction memory MEM_INT_IMEM_SIZE : natural := 16*1024; -- size of processor-internal instruction memory in bytes MEM_INT_IMEM_ROM : boolean := false; -- implement processor-internal instruction memory as ROM -- Internal Data memory -- MEM_INT_DMEM_USE : boolean := true; -- implement processor-internal data memory MEM_INT_DMEM_SIZE : natural := 8*1024; -- size of processor-internal data memory in bytes -- 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 := false; -- implement true random number generator (TRNG)? IO_CFU0_USE : boolean := false; -- implement custom functions unit 0 (CFU0)? IO_CFU1_USE : boolean := false -- implement custom functions unit 1 (CFU1)? ); port ( -- Global control -- clk_i : in std_ulogic := '0'; -- global clock, rising edge rstn_i : in std_ulogic := '0'; -- global reset, low-active, async -- Wishbone bus interface -- wb_tag_o : out std_ulogic_vector(02 downto 0); -- tag wb_adr_o : out std_ulogic_vector(31 downto 0); -- address wb_dat_i : in std_ulogic_vector(31 downto 0) := (others => '0'); -- read data wb_dat_o : out std_ulogic_vector(31 downto 0); -- write data wb_we_o : out std_ulogic; -- read/write wb_sel_o : out std_ulogic_vector(03 downto 0); -- byte enable wb_stb_o : out std_ulogic; -- strobe wb_cyc_o : out std_ulogic; -- valid cycle wb_lock_o : out std_ulogic; -- locked/exclusive bus access wb_ack_i : in std_ulogic := '0'; -- transfer acknowledge wb_err_i : in std_ulogic := '0'; -- transfer error -- Advanced memory control signals (available if MEM_EXT_USE = true) -- fence_o : out std_ulogic; -- indicates an executed FENCE operation fencei_o : out std_ulogic; -- indicates an executed FENCEI operation -- GPIO -- gpio_o : out std_ulogic_vector(31 downto 0); -- parallel output gpio_i : in std_ulogic_vector(31 downto 0) := (others => '0'); -- parallel input -- UART -- uart_txd_o : out std_ulogic; -- UART send data uart_rxd_i : in std_ulogic := '0'; -- UART receive data -- SPI -- spi_sck_o : out std_ulogic; -- SPI serial clock spi_sdo_o : out std_ulogic; -- controller data out, peripheral data in spi_sdi_i : in std_ulogic := '0'; -- controller data in, peripheral data out spi_csn_o : out std_ulogic_vector(07 downto 0); -- SPI CS -- TWI -- twi_sda_io : inout std_logic; -- twi serial data line twi_scl_io : inout std_logic; -- twi serial clock line -- PWM -- pwm_o : out std_ulogic_vector(03 downto 0); -- pwm channels -- system time input from external MTIME (available if IO_MTIME_USE = false) -- mtime_i : in std_ulogic_vector(63 downto 0) := (others => '0'); -- current system time -- Interrupts -- mtime_irq_i : in std_ulogic := '0'; -- machine timer interrupt, available if IO_MTIME_USE = false msw_irq_i : in std_ulogic := '0'; -- machine software interrupt mext_irq_i : in std_ulogic := '0' -- machine external interrupt ); end component; -- Component: CPU Top Entity -------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_cpu generic ( -- General -- HW_THREAD_ID : std_ulogic_vector(31 downto 0) := (others => '0'); -- hardware thread id CPU_BOOT_ADDR : std_ulogic_vector(31 downto 0) := (others => '0'); -- cpu boot address -- RISC-V CPU Extensions -- CPU_EXTENSION_RISCV_A : boolean := false; -- implement atomic extension? CPU_EXTENSION_RISCV_C : boolean := false; -- implement compressed extension? CPU_EXTENSION_RISCV_E : boolean := false; -- implement embedded RF extension? CPU_EXTENSION_RISCV_M : boolean := false; -- implement muld/div extension? CPU_EXTENSION_RISCV_U : boolean := false; -- implement user mode extension? CPU_EXTENSION_RISCV_Zicsr : boolean := true; -- implement CSR system? CPU_EXTENSION_RISCV_Zifencei : boolean := true; -- 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 -- Physical Memory Protection (PMP) -- PMP_USE : boolean := false -- implement PMP? ); port ( -- global control -- clk_i : in std_ulogic := '0'; -- global clock, rising edge rstn_i : in std_ulogic := '0'; -- global reset, low-active, async -- instruction bus interface -- i_bus_addr_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus access address i_bus_rdata_i : in std_ulogic_vector(data_width_c-1 downto 0) := (others => '0'); -- bus read data i_bus_wdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus write data i_bus_ben_o : out std_ulogic_vector(03 downto 0); -- byte enable i_bus_we_o : out std_ulogic; -- write enable i_bus_re_o : out std_ulogic; -- read enable i_bus_cancel_o : out std_ulogic; -- cancel current bus transaction i_bus_ack_i : in std_ulogic := '0'; -- bus transfer acknowledge i_bus_err_i : in std_ulogic := '0'; -- bus transfer error i_bus_fence_o : out std_ulogic; -- executed FENCEI operation i_bus_priv_o : out std_ulogic_vector(1 downto 0); -- privilege level i_bus_lock_o : out std_ulogic; -- locked/exclusive access -- data bus interface -- d_bus_addr_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus access address d_bus_rdata_i : in std_ulogic_vector(data_width_c-1 downto 0) := (others => '0'); -- bus read data d_bus_wdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus write data d_bus_ben_o : out std_ulogic_vector(03 downto 0); -- byte enable d_bus_we_o : out std_ulogic; -- write enable d_bus_re_o : out std_ulogic; -- read enable d_bus_cancel_o : out std_ulogic; -- cancel current bus transaction d_bus_ack_i : in std_ulogic := '0'; -- bus transfer acknowledge d_bus_err_i : in std_ulogic := '0'; -- bus transfer error d_bus_fence_o : out std_ulogic; -- executed FENCE operation d_bus_priv_o : out std_ulogic_vector(1 downto 0); -- privilege level d_bus_lock_o : out std_ulogic; -- locked/exclusive access -- system time input from MTIME -- time_i : in std_ulogic_vector(63 downto 0) := (others => '0'); -- current system time -- interrupts (risc-v compliant) -- msw_irq_i : in std_ulogic := '0'; -- machine software interrupt mext_irq_i : in std_ulogic := '0'; -- machine external interrupt mtime_irq_i : in std_ulogic := '0'; -- machine timer interrupt -- fast interrupts (custom) -- firq_i : in std_ulogic_vector(3 downto 0) := (others => '0') ); end component; -- Component: CPU Control ----------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_cpu_control generic ( -- General -- HW_THREAD_ID : std_ulogic_vector(31 downto 0):= x"00000000"; -- hardware thread id CPU_BOOT_ADDR : std_ulogic_vector(31 downto 0):= x"00000000"; -- cpu boot address -- RISC-V CPU Extensions -- CPU_EXTENSION_RISCV_A : boolean := false; -- implement atomic extension? CPU_EXTENSION_RISCV_C : boolean := false; -- implement compressed extension? CPU_EXTENSION_RISCV_E : boolean := false; -- implement embedded RF extension? CPU_EXTENSION_RISCV_M : boolean := false; -- implement muld/div extension? CPU_EXTENSION_RISCV_U : boolean := false; -- implement user mode extension? CPU_EXTENSION_RISCV_Zicsr : boolean := true; -- implement CSR system? CPU_EXTENSION_RISCV_Zifencei : boolean := true; -- implement instruction stream sync.? -- Physical memory protection (PMP) -- PMP_USE : boolean := false -- implement physical memory protection? ); port ( -- global control -- clk_i : in std_ulogic; -- global clock, rising edge rstn_i : in std_ulogic; -- global reset, low-active, async ctrl_o : out std_ulogic_vector(ctrl_width_c-1 downto 0); -- main control bus -- status input -- alu_wait_i : in std_ulogic; -- wait for ALU bus_i_wait_i : in std_ulogic; -- wait for bus bus_d_wait_i : in std_ulogic; -- wait for bus -- data input -- instr_i : in std_ulogic_vector(data_width_c-1 downto 0); -- instruction cmp_i : in std_ulogic_vector(1 downto 0); -- comparator status alu_add_i : in std_ulogic_vector(data_width_c-1 downto 0); -- ALU address result rs1_i : in std_ulogic_vector(data_width_c-1 downto 0); -- rf source 1 -- data output -- imm_o : out std_ulogic_vector(data_width_c-1 downto 0); -- immediate fetch_pc_o : out std_ulogic_vector(data_width_c-1 downto 0); -- PC for instruction fetch curr_pc_o : out std_ulogic_vector(data_width_c-1 downto 0); -- current PC (corresponding to current instruction) csr_rdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- CSR read data -- interrupts (risc-v compliant) -- msw_irq_i : in std_ulogic; -- machine software interrupt mext_irq_i : in std_ulogic; -- machine external interrupt mtime_irq_i : in std_ulogic; -- machine timer interrupt -- fast interrupts (custom) -- firq_i : in std_ulogic_vector(3 downto 0); -- system time input from MTIME -- time_i : in std_ulogic_vector(63 downto 0); -- current system time -- physical memory protection -- pmp_addr_o : out pmp_addr_if_t; -- addresses pmp_ctrl_o : out pmp_ctrl_if_t; -- configs -- bus access exceptions -- mar_i : in std_ulogic_vector(data_width_c-1 downto 0); -- memory address register ma_instr_i : in std_ulogic; -- misaligned instruction address ma_load_i : in std_ulogic; -- misaligned load data address ma_store_i : in std_ulogic; -- misaligned store data address be_instr_i : in std_ulogic; -- bus error on instruction access be_load_i : in std_ulogic; -- bus error on load data access be_store_i : in std_ulogic -- bus error on store data access ); end component; -- Component: CPU Register File ----------------------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_cpu_regfile generic ( CPU_EXTENSION_RISCV_E : boolean := false -- implement embedded RF extension? ); port ( -- global control -- clk_i : in std_ulogic; -- global clock, rising edge ctrl_i : in std_ulogic_vector(ctrl_width_c-1 downto 0); -- main control bus -- data input -- mem_i : in std_ulogic_vector(data_width_c-1 downto 0); -- memory read data alu_i : in std_ulogic_vector(data_width_c-1 downto 0); -- ALU result csr_i : in std_ulogic_vector(data_width_c-1 downto 0); -- CSR read data -- data output -- rs1_o : out std_ulogic_vector(data_width_c-1 downto 0); -- operand 1 rs2_o : out std_ulogic_vector(data_width_c-1 downto 0) -- operand 2 ); end component; -- Component: CPU ALU --------------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_cpu_alu generic ( CPU_EXTENSION_RISCV_M : boolean := true; -- implement muld/div extension? FAST_SHIFT_EN : boolean := false -- use barrel shifter for shift operations ); port ( -- global control -- clk_i : in std_ulogic; -- global clock, rising edge rstn_i : in std_ulogic; -- global reset, low-active, async ctrl_i : in std_ulogic_vector(ctrl_width_c-1 downto 0); -- main control bus -- data input -- rs1_i : in std_ulogic_vector(data_width_c-1 downto 0); -- rf source 1 rs2_i : in std_ulogic_vector(data_width_c-1 downto 0); -- rf source 2 pc2_i : in std_ulogic_vector(data_width_c-1 downto 0); -- delayed PC imm_i : in std_ulogic_vector(data_width_c-1 downto 0); -- immediate -- data output -- cmp_o : out std_ulogic_vector(1 downto 0); -- comparator status res_o : out std_ulogic_vector(data_width_c-1 downto 0); -- ALU result add_o : out std_ulogic_vector(data_width_c-1 downto 0); -- address computation result opb_o : out std_ulogic_vector(data_width_c-1 downto 0); -- ALU operand B -- co-processor interface -- cp0_start_o : out std_ulogic; -- trigger co-processor 0 cp0_data_i : in std_ulogic_vector(data_width_c-1 downto 0); -- co-processor 0 result cp0_valid_i : in std_ulogic; -- co-processor 0 result valid cp1_start_o : out std_ulogic; -- trigger co-processor 1 cp1_data_i : in std_ulogic_vector(data_width_c-1 downto 0); -- co-processor 1 result cp1_valid_i : in std_ulogic; -- co-processor 1 result valid cp2_start_o : out std_ulogic; -- trigger co-processor 2 cp2_data_i : in std_ulogic_vector(data_width_c-1 downto 0); -- co-processor 2 result cp2_valid_i : in std_ulogic; -- co-processor 2 result valid cp3_start_o : out std_ulogic; -- trigger co-processor 3 cp3_data_i : in std_ulogic_vector(data_width_c-1 downto 0); -- co-processor 3 result cp3_valid_i : in std_ulogic; -- co-processor 3 result valid -- status -- wait_o : out std_ulogic -- busy due to iterative processing units ); end component; -- Component: CPU Co-Processor MULDIV ----------------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_cpu_cp_muldiv generic ( FAST_MUL_EN : boolean := false -- use DSPs for faster multiplication ); port ( -- global control -- clk_i : in std_ulogic; -- global clock, rising edge rstn_i : in std_ulogic; -- global reset, low-active, async ctrl_i : in std_ulogic_vector(ctrl_width_c-1 downto 0); -- main control bus start_i : in std_ulogic; -- trigger operation -- data input -- rs1_i : in std_ulogic_vector(data_width_c-1 downto 0); -- rf source 1 rs2_i : in std_ulogic_vector(data_width_c-1 downto 0); -- rf source 2 -- result and status -- res_o : out std_ulogic_vector(data_width_c-1 downto 0); -- operation result valid_o : out std_ulogic -- data output valid ); end component; -- Component: CPU Bus Interface ----------------------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_cpu_bus generic ( CPU_EXTENSION_RISCV_C : boolean := true; -- implement compressed extension? -- Physical memory protection (PMP) -- PMP_USE : boolean := false -- implement physical memory protection? ); port ( -- global control -- clk_i : in std_ulogic; -- global clock, rising edge rstn_i : in std_ulogic := '0'; -- global reset, low-active, async ctrl_i : in std_ulogic_vector(ctrl_width_c-1 downto 0); -- main control bus -- cpu instruction fetch interface -- fetch_pc_i : in std_ulogic_vector(data_width_c-1 downto 0); -- PC for instruction fetch instr_o : out std_ulogic_vector(data_width_c-1 downto 0); -- instruction i_wait_o : out std_ulogic; -- wait for fetch to complete -- ma_instr_o : out std_ulogic; -- misaligned instruction address be_instr_o : out std_ulogic; -- bus error on instruction access -- cpu data access interface -- addr_i : in std_ulogic_vector(data_width_c-1 downto 0); -- ALU result -> access address wdata_i : in std_ulogic_vector(data_width_c-1 downto 0); -- write data rdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- read data mar_o : out std_ulogic_vector(data_width_c-1 downto 0); -- current memory address register d_wait_o : out std_ulogic; -- wait for access to complete -- ma_load_o : out std_ulogic; -- misaligned load data address ma_store_o : out std_ulogic; -- misaligned store data address be_load_o : out std_ulogic; -- bus error on load data access be_store_o : out std_ulogic; -- bus error on store data access -- physical memory protection -- pmp_addr_i : in pmp_addr_if_t; -- addresses pmp_ctrl_i : in pmp_ctrl_if_t; -- configs -- instruction bus -- i_bus_addr_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus access address i_bus_rdata_i : in std_ulogic_vector(data_width_c-1 downto 0); -- bus read data i_bus_wdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus write data i_bus_ben_o : out std_ulogic_vector(03 downto 0); -- byte enable i_bus_we_o : out std_ulogic; -- write enable i_bus_re_o : out std_ulogic; -- read enable i_bus_cancel_o : out std_ulogic; -- cancel current bus transaction i_bus_ack_i : in std_ulogic; -- bus transfer acknowledge i_bus_err_i : in std_ulogic; -- bus transfer error i_bus_fence_o : out std_ulogic; -- fence operation i_bus_lock_o : out std_ulogic; -- locked/exclusive access -- data bus -- d_bus_addr_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus access address d_bus_rdata_i : in std_ulogic_vector(data_width_c-1 downto 0); -- bus read data d_bus_wdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus write data d_bus_ben_o : out std_ulogic_vector(03 downto 0); -- byte enable d_bus_we_o : out std_ulogic; -- write enable d_bus_re_o : out std_ulogic; -- read enable d_bus_cancel_o : out std_ulogic; -- cancel current bus transaction d_bus_ack_i : in std_ulogic; -- bus transfer acknowledge d_bus_err_i : in std_ulogic; -- bus transfer error d_bus_fence_o : out std_ulogic; -- fence operation d_bus_lock_o : out std_ulogic -- locked/exclusive access ); end component; -- Component: CPU Bus Switch -------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_busswitch generic ( PORT_CA_READ_ONLY : boolean := false; -- set if controller port A is read-only PORT_CB_READ_ONLY : boolean := false -- set if controller port B is read-only ); port ( -- global control -- clk_i : in std_ulogic; -- global clock, rising edge rstn_i : in std_ulogic; -- global reset, low-active, async -- controller interface a -- ca_bus_addr_i : in std_ulogic_vector(data_width_c-1 downto 0); -- bus access address ca_bus_rdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus read data ca_bus_wdata_i : in std_ulogic_vector(data_width_c-1 downto 0); -- bus write data ca_bus_ben_i : in std_ulogic_vector(03 downto 0); -- byte enable ca_bus_we_i : in std_ulogic; -- write enable ca_bus_re_i : in std_ulogic; -- read enable ca_bus_cancel_i : in std_ulogic; -- cancel current bus transaction ca_bus_lock_i : in std_ulogic; -- locked/exclusive access ca_bus_ack_o : out std_ulogic; -- bus transfer acknowledge ca_bus_err_o : out std_ulogic; -- bus transfer error -- controller interface b -- cb_bus_addr_i : in std_ulogic_vector(data_width_c-1 downto 0); -- bus access address cb_bus_rdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus read data cb_bus_wdata_i : in std_ulogic_vector(data_width_c-1 downto 0); -- bus write data cb_bus_ben_i : in std_ulogic_vector(03 downto 0); -- byte enable cb_bus_we_i : in std_ulogic; -- write enable cb_bus_re_i : in std_ulogic; -- read enable cb_bus_cancel_i : in std_ulogic; -- cancel current bus transaction cb_bus_lock_i : in std_ulogic; -- locked/exclusive access cb_bus_ack_o : out std_ulogic; -- bus transfer acknowledge cb_bus_err_o : out std_ulogic; -- bus transfer error -- peripheral bus -- p_bus_src_o : out std_ulogic; -- access source: 0 = A, 1 = B p_bus_addr_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus access address p_bus_rdata_i : in std_ulogic_vector(data_width_c-1 downto 0); -- bus read data p_bus_wdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus write data p_bus_ben_o : out std_ulogic_vector(03 downto 0); -- byte enable p_bus_we_o : out std_ulogic; -- write enable p_bus_re_o : out std_ulogic; -- read enable p_bus_cancel_o : out std_ulogic; -- cancel current bus transaction p_bus_lock_o : out std_ulogic; -- locked/exclusive access p_bus_ack_i : in std_ulogic; -- bus transfer acknowledge p_bus_err_i : in std_ulogic -- bus transfer error ); end component; -- Component: CPU Compressed Instructions Decompressor ------------------------------------ -- ------------------------------------------------------------------------------------------- component neorv32_cpu_decompressor port ( -- instruction input -- ci_instr16_i : in std_ulogic_vector(15 downto 0); -- compressed instruction input -- instruction output -- ci_illegal_o : out std_ulogic; -- is an illegal compressed instruction ci_instr32_o : out std_ulogic_vector(31 downto 0) -- 32-bit decompressed instruction ); end component; -- Component: Processor-internal instruction memory (IMEM) -------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_imem generic ( IMEM_BASE : std_ulogic_vector(31 downto 0) := x"00000000"; -- memory base address IMEM_SIZE : natural := 4*1024; -- processor-internal instruction memory size in bytes IMEM_AS_ROM : boolean := false; -- implement IMEM as read-only memory? BOOTLOADER_USE : boolean := true -- implement and use bootloader? ); port ( clk_i : in std_ulogic; -- global clock line rden_i : in std_ulogic; -- read enable wren_i : in std_ulogic; -- write enable ben_i : in std_ulogic_vector(03 downto 0); -- byte write enable addr_i : in std_ulogic_vector(31 downto 0); -- address data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic -- transfer acknowledge ); end component; -- Component: Processor-internal data memory (DMEM) --------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_dmem generic ( DMEM_BASE : std_ulogic_vector(31 downto 0) := x"80000000"; -- memory base address DMEM_SIZE : natural := 4*1024 -- processor-internal instruction memory size in bytes ); port ( clk_i : in std_ulogic; -- global clock line rden_i : in std_ulogic; -- read enable wren_i : in std_ulogic; -- write enable ben_i : in std_ulogic_vector(03 downto 0); -- byte write enable addr_i : in std_ulogic_vector(31 downto 0); -- address data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic -- transfer acknowledge ); end component; -- Component: Processor-internal bootloader ROM (BOOTROM) --------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_boot_rom generic ( BOOTROM_BASE : std_ulogic_vector(31 downto 0) := x"FFFF0000"; -- boot ROM base address BOOTROM_SIZE : natural := 4*1024 -- processor-internal boot ROM memory size in bytes ); port ( clk_i : in std_ulogic; -- global clock line rden_i : in std_ulogic; -- read enable addr_i : in std_ulogic_vector(31 downto 0); -- address data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic -- transfer acknowledge ); end component; -- Component: Machine System Timer (mtime) ------------------------------------------------ -- ------------------------------------------------------------------------------------------- component neorv32_mtime port ( -- host access -- clk_i : in std_ulogic; -- global clock line rstn_i : in std_ulogic := '0'; -- global reset, low-active, async addr_i : in std_ulogic_vector(31 downto 0); -- address rden_i : in std_ulogic; -- read enable wren_i : in std_ulogic; -- write enable data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic; -- transfer acknowledge -- time output for CPU -- time_o : out std_ulogic_vector(63 downto 0); -- current system time -- interrupt -- irq_o : out std_ulogic -- interrupt request ); end component; -- Component: General Purpose Input/Output Port (GPIO) ------------------------------------ -- ------------------------------------------------------------------------------------------- component neorv32_gpio 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 wren_i : in std_ulogic; -- write enable data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic; -- transfer acknowledge -- parallel io -- gpio_o : out std_ulogic_vector(31 downto 0); gpio_i : in std_ulogic_vector(31 downto 0); -- interrupt -- irq_o : out std_ulogic ); end component; -- Component: Watchdog Timer (WDT) -------------------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_wdt port ( -- host access -- clk_i : in std_ulogic; -- global clock line rstn_i : in std_ulogic; -- global reset line, low-active rden_i : in std_ulogic; -- read enable wren_i : in std_ulogic; -- write enable addr_i : in std_ulogic_vector(31 downto 0); -- address data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic; -- transfer acknowledge -- clock generator -- clkgen_en_o : out std_ulogic; -- enable clock generator clkgen_i : in std_ulogic_vector(07 downto 0); -- timeout event -- irq_o : out std_ulogic; -- timeout IRQ rstn_o : out std_ulogic -- timeout reset, low_active, use it as async! ); end component; -- Component: Universal Asynchronous Receiver and Transmitter (UART) ---------------------- -- ------------------------------------------------------------------------------------------- component neorv32_uart 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 wren_i : in std_ulogic; -- write enable data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic; -- transfer acknowledge -- clock generator -- clkgen_en_o : out std_ulogic; -- enable clock generator clkgen_i : in std_ulogic_vector(07 downto 0); -- com lines -- uart_txd_o : out std_ulogic; uart_rxd_i : in std_ulogic; -- interrupts -- uart_irq_o : out std_ulogic -- uart rx/tx interrupt ); end component; -- Component: Serial Peripheral Interface (SPI) ------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_spi 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 wren_i : in std_ulogic; -- write enable data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic; -- transfer acknowledge -- clock generator -- clkgen_en_o : out std_ulogic; -- enable clock generator clkgen_i : in std_ulogic_vector(07 downto 0); -- com lines -- spi_sck_o : out std_ulogic; -- SPI serial clock spi_sdo_o : out std_ulogic; -- controller data out, peripheral data in spi_sdi_i : in std_ulogic; -- controller data in, peripheral data out spi_csn_o : out std_ulogic_vector(07 downto 0); -- SPI CS -- interrupt -- spi_irq_o : out std_ulogic -- transmission done interrupt ); end component; -- Component: Two-Wire Interface (TWI) ---------------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_twi 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 wren_i : in std_ulogic; -- write enable data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic; -- transfer acknowledge -- clock generator -- clkgen_en_o : out std_ulogic; -- enable clock generator clkgen_i : in std_ulogic_vector(07 downto 0); -- com lines -- twi_sda_io : inout std_logic; -- serial data line twi_scl_io : inout std_logic; -- serial clock line -- interrupt -- twi_irq_o : out std_ulogic -- transfer done IRQ ); end component; -- Component: Pulse-Width Modulation Controller (PWM) ------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_pwm 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 wren_i : in std_ulogic; -- write enable data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic; -- transfer acknowledge -- clock generator -- clkgen_en_o : out std_ulogic; -- enable clock generator clkgen_i : in std_ulogic_vector(07 downto 0); -- pwm output channels -- pwm_o : out std_ulogic_vector(03 downto 0) ); end component; -- Component: True Random Number Generator (TRNG) ----------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_trng 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 wren_i : in std_ulogic; -- write enable data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic -- transfer acknowledge ); end component; -- Component: Wishbone Bus Gateway (WISHBONE) --------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_wishbone generic ( WB_PIPELINED_MODE : boolean := false; -- false: classic/standard wishbone mode, true: pipelined wishbone mode -- Internal instruction memory -- 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 -- Internal data memory -- 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 ); port ( -- global control -- clk_i : in std_ulogic; -- global clock line rstn_i : in std_ulogic; -- global reset line, low-active -- host access -- src_i : in std_ulogic; -- access type (0: data, 1:instruction) addr_i : in std_ulogic_vector(31 downto 0); -- address rden_i : in std_ulogic; -- read enable wren_i : in std_ulogic; -- write enable ben_i : in std_ulogic_vector(03 downto 0); -- byte write enable data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out cancel_i : in std_ulogic; -- cancel current bus transaction lock_i : in std_ulogic; -- locked/exclusive bus access ack_o : out std_ulogic; -- transfer acknowledge err_o : out std_ulogic; -- transfer error priv_i : in std_ulogic_vector(1 downto 0); -- current CPU privilege level -- wishbone interface -- wb_tag_o : out std_ulogic_vector(2 downto 0); -- tag wb_adr_o : out std_ulogic_vector(31 downto 0); -- address wb_dat_i : in std_ulogic_vector(31 downto 0); -- read data wb_dat_o : out std_ulogic_vector(31 downto 0); -- write data wb_we_o : out std_ulogic; -- read/write wb_sel_o : out std_ulogic_vector(03 downto 0); -- byte enable wb_stb_o : out std_ulogic; -- strobe wb_cyc_o : out std_ulogic; -- valid cycle wb_lock_o : out std_ulogic; -- locked/exclusive bus access wb_ack_i : in std_ulogic; -- transfer acknowledge wb_err_i : in std_ulogic -- transfer error ); end component; -- Component: Custom Functions Unit 0 (CFU0) ---------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_cfu0 port ( -- host access -- clk_i : in std_ulogic; -- global clock line rstn_i : in std_ulogic; -- global reset line, low-active, use as async addr_i : in std_ulogic_vector(31 downto 0); -- address rden_i : in std_ulogic; -- read enable wren_i : in std_ulogic; -- write enable data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic; -- transfer acknowledge -- clock generator -- clkgen_en_o : out std_ulogic; -- enable clock generator clkgen_i : in std_ulogic_vector(07 downto 0) -- "clock" inputs -- custom io -- -- ... ); end component; -- Component: Custom Functions Unit 1 (CFU1) ---------------------------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_cfu1 port ( -- host access -- clk_i : in std_ulogic; -- global clock line rstn_i : in std_ulogic; -- global reset line, low-active, use as async addr_i : in std_ulogic_vector(31 downto 0); -- address rden_i : in std_ulogic; -- read enable wren_i : in std_ulogic; -- write enable data_i : in std_ulogic_vector(31 downto 0); -- data in data_o : out std_ulogic_vector(31 downto 0); -- data out ack_o : out std_ulogic; -- transfer acknowledge -- clock generator -- clkgen_en_o : out std_ulogic; -- enable clock generator clkgen_i : in std_ulogic_vector(07 downto 0) -- "clock" inputs -- custom io -- -- ... ); end component; -- Component: System Configuration Information Memory (SYSINFO) --------------------------- -- ------------------------------------------------------------------------------------------- component neorv32_sysinfo 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 -- Internal Instruction memory -- 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 -- Internal Data memory -- 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 -- 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_CFU0_USE : boolean := true; -- implement custom functions unit 0 (CFU0)? IO_CFU1_USE : boolean := true -- implement custom functions unit 1 (CFU1)? ); 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 component; end neorv32_package; package body neorv32_package is -- Function: Minimal required bit width --------------------------------------------------- -- ------------------------------------------------------------------------------------------- function index_size_f(input : natural) return natural is begin for i in 0 to natural'high loop if (2**i >= input) then return i; end if; end loop; -- i return 0; end function index_size_f; -- Function: Conditional select natural --------------------------------------------------- -- ------------------------------------------------------------------------------------------- function cond_sel_natural_f(cond : boolean; val_t : natural; val_f : natural) return natural is begin if (cond = true) then return val_t; else return val_f; end if; end function cond_sel_natural_f; -- Function: Conditional select std_ulogic_vector ----------------------------------------- -- ------------------------------------------------------------------------------------------- function cond_sel_stdulogicvector_f(cond : boolean; val_t : std_ulogic_vector; val_f : std_ulogic_vector) return std_ulogic_vector is begin if (cond = true) then return val_t; else return val_f; end if; end function cond_sel_stdulogicvector_f; -- Function: Convert BOOL to STD_ULOGIC --------------------------------------------------- -- ------------------------------------------------------------------------------------------- function bool_to_ulogic_f(cond : boolean) return std_ulogic is begin if (cond = true) then return '1'; else return '0'; end if; end function bool_to_ulogic_f; -- Function: OR all bits ------------------------------------------------------------------ -- ------------------------------------------------------------------------------------------- function or_all_f(a : std_ulogic_vector) return std_ulogic is variable tmp_v : std_ulogic; begin tmp_v := a(a'low); if (a'low < a'high) then -- not null range? for i in a'low+1 to a'high loop tmp_v := tmp_v or a(i); end loop; -- i end if; return tmp_v; end function or_all_f; -- Function: AND all bits ----------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- function and_all_f(a : std_ulogic_vector) return std_ulogic is variable tmp_v : std_ulogic; begin tmp_v := a(a'low); if (a'low < a'high) then -- not null range? for i in a'low+1 to a'high loop tmp_v := tmp_v and a(i); end loop; -- i end if; return tmp_v; end function and_all_f; -- Function: XOR all bits ----------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- function xor_all_f(a : std_ulogic_vector) return std_ulogic is variable tmp_v : std_ulogic; begin tmp_v := a(a'low); if (a'low < a'high) then -- not null range? for i in a'low+1 to a'high loop tmp_v := tmp_v xor a(i); end loop; -- i end if; return tmp_v; end function xor_all_f; -- Function: XNOR all bits ---------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- function xnor_all_f(a : std_ulogic_vector) return std_ulogic is variable tmp_v : std_ulogic; begin tmp_v := a(a'low); if (a'low < a'high) then -- not null range? for i in a'low+1 to a'high loop tmp_v := tmp_v xnor a(i); end loop; -- i end if; return tmp_v; end function xnor_all_f; -- Function: Convert std_ulogic_vector to hex char ---------------------------------------- -- ------------------------------------------------------------------------------------------- function to_hexchar_f(input : std_ulogic_vector(3 downto 0)) return character is variable output_v : character; begin case input is when x"0" => output_v := '0'; when x"1" => output_v := '1'; when x"2" => output_v := '2'; when x"3" => output_v := '3'; when x"4" => output_v := '4'; when x"5" => output_v := '5'; when x"6" => output_v := '6'; when x"7" => output_v := '7'; when x"8" => output_v := '8'; when x"9" => output_v := '9'; when x"a" => output_v := 'a'; when x"b" => output_v := 'b'; when x"c" => output_v := 'c'; when x"d" => output_v := 'd'; when x"e" => output_v := 'e'; when x"f" => output_v := 'f'; when others => output_v := '?'; end case; return output_v; end function to_hexchar_f; -- Function: Convert hex char to std_ulogic_vector ---------------------------------------- -- ------------------------------------------------------------------------------------------- function hexchar_to_stdulogicvector_f(input : character) return std_ulogic_vector is variable hex_value_v : std_ulogic_vector(3 downto 0); begin case input is when '0' => hex_value_v := x"0"; when '1' => hex_value_v := x"1"; when '2' => hex_value_v := x"2"; when '3' => hex_value_v := x"3"; when '4' => hex_value_v := x"4"; when '5' => hex_value_v := x"5"; when '6' => hex_value_v := x"6"; when '7' => hex_value_v := x"7"; when '8' => hex_value_v := x"8"; when '9' => hex_value_v := x"9"; when 'a' | 'A' => hex_value_v := x"a"; when 'b' | 'B' => hex_value_v := x"b"; when 'c' | 'C' => hex_value_v := x"c"; when 'd' | 'D' => hex_value_v := x"d"; when 'e' | 'E' => hex_value_v := x"e"; when 'f' | 'F' => hex_value_v := x"f"; when others => hex_value_v := (others => 'X'); end case; return hex_value_v; end function hexchar_to_stdulogicvector_f; -- Function: Bit reversal ----------------------------------------------------------------- -- ------------------------------------------------------------------------------------------- function bit_rev_f(input : std_ulogic_vector) return std_ulogic_vector is variable output_v : std_ulogic_vector(input'range); begin for i in 0 to input'length-1 loop output_v(input'length-i-1) := input(i); end loop; -- i return output_v; end function bit_rev_f; -- Function: Test if input number is a power of two --------------------------------------- -- ------------------------------------------------------------------------------------------- function is_power_of_two_f(input : natural) return boolean is begin if (input = 1) then -- 2^0 return true; elsif ((input / 2) /= 0) and ((input mod 2) = 0) then return true; else return false; end if; end function is_power_of_two_f; -- Function: Swap all bytes of a 32-bit word (endianness conversion) ---------------------- -- ------------------------------------------------------------------------------------------- function bswap32_f(input : std_ulogic_vector) return std_ulogic_vector is variable output_v : std_ulogic_vector(input'range); begin output_v(07 downto 00) := input(31 downto 24); output_v(15 downto 08) := input(23 downto 16); output_v(23 downto 16) := input(15 downto 08); output_v(31 downto 24) := input(07 downto 00); return output_v; end function bswap32_f; end neorv32_package;
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