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[/] [neorv32/] [trunk/] [rtl/] [core/] [neorv32_package.vhd] - Diff between revs 41 and 42

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Line 1... Line 1... 
-- #################################################################################################
 
-- #################################################################################################
 
-- # << NEORV32 - Main VHDL package file >>                                                        #
 
-- # << NEORV32 - Main VHDL package file >>                                                        #
 
-- # ********************************************************************************************* #
 
-- # ********************************************************************************************* #
 
-- # BSD 3-Clause License                                                                          #
 
-- # BSD 3-Clause License                                                                          #
 
-- #                                                                                               #
 
-- #                                                                                               #
 
-- # Copyright (c) 2020, Stephan Nolting. All rights reserved.                                     #
 
-- # Copyright (c) 2021, Stephan Nolting. All rights reserved.                                     #
 
-- #                                                                                               #
 
-- #                                                                                               #
 
-- # Redistribution and use in source and binary forms, with or without modification, are          #
 
-- # Redistribution and use in source and binary forms, with or without modification, are          #
 
-- # permitted provided that the following conditions are met:                                     #
 
-- # permitted provided that the following conditions are met:                                     #
 
-- #                                                                                               #
 
-- #                                                                                               #
 
-- # 1. Redistributions of source code must retain the above copyright notice, this list of        #
 
-- # 1. Redistributions of source code must retain the above copyright notice, this list of        #
Line 50... Line 50... 
  constant xbus_big_endian_c : boolean := true; -- external memory access byte order: true=big endian (default); false=little endian
 
  constant xbus_big_endian_c : boolean := true; -- external memory access byte order: true=big endian (default); false=little endian
 
 
 
 
 
  -- CPU core --
 
  -- CPU core --
 
  constant ipb_entries_c : natural := 2; -- entries in CPU instruction prefetch buffer, has to be a power of 2, default=2
 
  constant ipb_entries_c : natural := 2; -- entries in CPU instruction prefetch buffer, has to be a power of 2, default=2
 
 
 
 
 
  -- 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!)= -----------------------------------------------
 
  -- Architecture Constants (do not modify!)= -----------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  constant data_width_c   : natural := 32; -- data width - do not change!
 
  constant data_width_c   : natural := 32; -- data width - do not change!
 
  constant hw_version_c   : std_ulogic_vector(31 downto 0) := x"01040904"; -- no touchy!
 
  constant hw_version_c   : std_ulogic_vector(31 downto 0) := x"01040908"; -- no touchy!
 
  constant pmp_max_r_c    : natural := 8; -- max PMP regions - FIXED!
 
  constant pmp_max_r_c    : natural := 8; -- max PMP regions - FIXED!
 
  constant archid_c       : natural := 19; -- official NEORV32 architecture ID - hands off!
 
  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
 
  constant rf_r0_is_reg_c : boolean := true; -- reg_file.r0 is a *physical register* that has to be initialized to zero by the CPU HW
 
 
 
 
 
  -- Helper Functions -----------------------------------------------------------------------
 
  -- Helper Functions -----------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  function index_size_f(input : natural) return natural;
 
  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_natural_f(cond : boolean; val_t : natural; val_f : natural) return natural;
Line 80... Line 76... 
  function is_power_of_two_f(input : natural) return boolean;
 
  function is_power_of_two_f(input : natural) return boolean;
 
  function bswap32_f(input : std_ulogic_vector) return std_ulogic_vector;
 
  function bswap32_f(input : std_ulogic_vector) return std_ulogic_vector;
 
 
 
 
 
  -- Internal Types -------------------------------------------------------------------------
 
  -- 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_ctrl_if_t is array (0 to 63) of std_ulogic_vector(07 downto 0);
 
  type pmp_addr_if_t is array (0 to pmp_max_r_c-1) of std_ulogic_vector(33 downto 0);
 
  type pmp_addr_if_t is array (0 to 63) of std_ulogic_vector(33 downto 0);
 
 
 
 
 
  -- Processor-Internal Address Space Layout ------------------------------------------------
 
  -- Processor-Internal Address Space Layout ------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  -- Internal Instruction Memory (IMEM) and Date Memory (DMEM) --
 
  -- 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 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
 
  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 data/instruction memory sizes are configured via top's generics
 
 
 
 
 
  -- Internal Bootloader ROM --
 
  -- 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_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_size_c      : natural := 4*1024; -- bytes
 
  constant boot_rom_max_size_c  : natural := 32*1024; -- bytes, fixed!
 
  constant boot_rom_max_size_c  : natural := 32*1024; -- bytes, fixed!
Line 323... Line 319... 
  -- system/csr --
 
  -- system/csr --
 
  constant funct3_env_c    : std_ulogic_vector(2 downto 0) := "000"; -- ecall, ebreak, mret, wfi
 
  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_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_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_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_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_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
 
  constant funct3_csrrci_c : std_ulogic_vector(2 downto 0) := "111"; -- atomic read & clear bit immediate
 
  -- fence --
 
  -- fence --
 
  constant funct3_fence_c  : std_ulogic_vector(2 downto 0) := "000"; -- fence - order IO/memory access (->NOP)
 
  constant funct3_fence_c  : std_ulogic_vector(2 downto 0) := "000"; -- fence - order IO/memory access (->NOP)
Line 348... Line 343... 
  constant funct5_a_sc_c : std_ulogic_vector(4 downto 0) := "00011"; -- SC
 
  constant funct5_a_sc_c : std_ulogic_vector(4 downto 0) := "00011"; -- SC
 
 
 
 
 
  -- RISC-V CSR Addresses -------------------------------------------------------------------
 
  -- RISC-V CSR Addresses -------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  -- read/write CSRs --
 
  -- read/write CSRs --
 
  constant csr_mstatus_c       : std_ulogic_vector(11 downto 0) := x"300"; -- mstatus
 
  constant csr_mstatus_c        : std_ulogic_vector(11 downto 0) := x"300";
 
  constant csr_misa_c          : std_ulogic_vector(11 downto 0) := x"301"; -- misa
 
  constant csr_misa_c           : std_ulogic_vector(11 downto 0) := x"301";
 
  constant csr_mie_c           : std_ulogic_vector(11 downto 0) := x"304"; -- mie
 
  constant csr_mie_c            : std_ulogic_vector(11 downto 0) := x"304";
 
  constant csr_mtvec_c         : std_ulogic_vector(11 downto 0) := x"305"; -- mtvec
 
  constant csr_mtvec_c          : std_ulogic_vector(11 downto 0) := x"305";
 
  constant csr_mcounteren_c    : std_ulogic_vector(11 downto 0) := x"306"; -- mcounteren
 
  constant csr_mcounteren_c     : std_ulogic_vector(11 downto 0) := x"306";
 
  constant csr_mstatush_c      : std_ulogic_vector(11 downto 0) := x"310"; -- mstatush
 
  constant csr_mstatush_c       : std_ulogic_vector(11 downto 0) := x"310";
 
  --
 
  --
 
  constant csr_mcountinhibit_c : std_ulogic_vector(11 downto 0) := x"320"; -- mcountinhibit
 
  constant csr_mcountinhibit_c  : std_ulogic_vector(11 downto 0) := x"320";
 
  --
 
  --
 
  constant csr_mscratch_c      : std_ulogic_vector(11 downto 0) := x"340"; -- mscratch
 
  constant csr_mhpmevent3_c     : std_ulogic_vector(11 downto 0) := x"323";
 
  constant csr_mepc_c          : std_ulogic_vector(11 downto 0) := x"341"; -- mepc
 
  constant csr_mhpmevent4_c     : std_ulogic_vector(11 downto 0) := x"324";
 
  constant csr_mcause_c        : std_ulogic_vector(11 downto 0) := x"342"; -- mcause
 
  constant csr_mhpmevent5_c     : std_ulogic_vector(11 downto 0) := x"325";
 
  constant csr_mtval_c         : std_ulogic_vector(11 downto 0) := x"343"; -- mtval
 
  constant csr_mhpmevent6_c     : std_ulogic_vector(11 downto 0) := x"326";
 
  constant csr_mip_c           : std_ulogic_vector(11 downto 0) := x"344"; -- mip
 
  constant csr_mhpmevent7_c     : std_ulogic_vector(11 downto 0) := x"327";
 
  --
 
  constant csr_mhpmevent8_c     : std_ulogic_vector(11 downto 0) := x"328";
 
  constant csr_pmpcfg0_c       : std_ulogic_vector(11 downto 0) := x"3a0"; -- pmpcfg0
 
  constant csr_mhpmevent9_c     : std_ulogic_vector(11 downto 0) := x"329";
 
  constant csr_pmpcfg1_c       : std_ulogic_vector(11 downto 0) := x"3a1"; -- pmpcfg1
 
  constant csr_mhpmevent10_c    : std_ulogic_vector(11 downto 0) := x"32a";
 
  --
 
  constant csr_mhpmevent11_c    : std_ulogic_vector(11 downto 0) := x"32b";
 
  constant csr_pmpaddr0_c      : std_ulogic_vector(11 downto 0) := x"3b0"; -- pmpaddr0
 
  constant csr_mhpmevent12_c    : std_ulogic_vector(11 downto 0) := x"32c";
 
  constant csr_pmpaddr1_c      : std_ulogic_vector(11 downto 0) := x"3b1"; -- pmpaddr1
 
  constant csr_mhpmevent13_c    : std_ulogic_vector(11 downto 0) := x"32d";
 
  constant csr_pmpaddr2_c      : std_ulogic_vector(11 downto 0) := x"3b2"; -- pmpaddr2
 
  constant csr_mhpmevent14_c    : std_ulogic_vector(11 downto 0) := x"32e";
 
  constant csr_pmpaddr3_c      : std_ulogic_vector(11 downto 0) := x"3b3"; -- pmpaddr3
 
  constant csr_mhpmevent15_c    : std_ulogic_vector(11 downto 0) := x"32f";
 
  constant csr_pmpaddr4_c      : std_ulogic_vector(11 downto 0) := x"3b4"; -- pmpaddr4
 
  constant csr_mhpmevent16_c    : std_ulogic_vector(11 downto 0) := x"330";
 
  constant csr_pmpaddr5_c      : std_ulogic_vector(11 downto 0) := x"3b5"; -- pmpaddr5
 
  constant csr_mhpmevent17_c    : std_ulogic_vector(11 downto 0) := x"331";
 
  constant csr_pmpaddr6_c      : std_ulogic_vector(11 downto 0) := x"3b6"; -- pmpaddr6
 
  constant csr_mhpmevent18_c    : std_ulogic_vector(11 downto 0) := x"332";
 
  constant csr_pmpaddr7_c      : std_ulogic_vector(11 downto 0) := x"3b7"; -- pmpaddr7
 
  constant csr_mhpmevent19_c    : std_ulogic_vector(11 downto 0) := x"333";
 
 
 
  constant csr_mhpmevent20_c    : std_ulogic_vector(11 downto 0) := x"334";
 
 
 
  constant csr_mhpmevent21_c    : std_ulogic_vector(11 downto 0) := x"335";
 
 
 
  constant csr_mhpmevent22_c    : std_ulogic_vector(11 downto 0) := x"336";
 
 
 
  constant csr_mhpmevent23_c    : std_ulogic_vector(11 downto 0) := x"337";
 
 
 
  constant csr_mhpmevent24_c    : std_ulogic_vector(11 downto 0) := x"338";
 
 
 
  constant csr_mhpmevent25_c    : std_ulogic_vector(11 downto 0) := x"339";
 
 
 
  constant csr_mhpmevent26_c    : std_ulogic_vector(11 downto 0) := x"33a";
 
 
 
  constant csr_mhpmevent27_c    : std_ulogic_vector(11 downto 0) := x"33b";
 
 
 
  constant csr_mhpmevent28_c    : std_ulogic_vector(11 downto 0) := x"33c";
 
 
 
  constant csr_mhpmevent29_c    : std_ulogic_vector(11 downto 0) := x"33d";
 
 
 
  constant csr_mhpmevent30_c    : std_ulogic_vector(11 downto 0) := x"33e";
 
 
 
  constant csr_mhpmevent31_c    : std_ulogic_vector(11 downto 0) := x"33f";
 
 
 
  --
 
 
 
  constant csr_mscratch_c       : std_ulogic_vector(11 downto 0) := x"340";
 
 
 
  constant csr_mepc_c           : std_ulogic_vector(11 downto 0) := x"341";
 
 
 
  constant csr_mcause_c         : std_ulogic_vector(11 downto 0) := x"342";
 
 
 
  constant csr_mtval_c          : std_ulogic_vector(11 downto 0) := x"343";
 
 
 
  constant csr_mip_c            : std_ulogic_vector(11 downto 0) := x"344";
 
 
 
  --
 
 
 
  constant csr_pmpcfg0_c        : std_ulogic_vector(11 downto 0) := x"3a0";
 
 
 
  constant csr_pmpcfg1_c        : std_ulogic_vector(11 downto 0) := x"3a1";
 
 
 
  constant csr_pmpcfg2_c        : std_ulogic_vector(11 downto 0) := x"3a2";
 
 
 
  constant csr_pmpcfg3_c        : std_ulogic_vector(11 downto 0) := x"3a3";
 
 
 
  constant csr_pmpcfg4_c        : std_ulogic_vector(11 downto 0) := x"3a4";
 
 
 
  constant csr_pmpcfg5_c        : std_ulogic_vector(11 downto 0) := x"3a5";
 
 
 
  constant csr_pmpcfg6_c        : std_ulogic_vector(11 downto 0) := x"3a6";
 
 
 
  constant csr_pmpcfg7_c        : std_ulogic_vector(11 downto 0) := x"3a7";
 
 
 
  constant csr_pmpcfg8_c        : std_ulogic_vector(11 downto 0) := x"3a8";
 
 
 
  constant csr_pmpcfg9_c        : std_ulogic_vector(11 downto 0) := x"3a9";
 
 
 
  constant csr_pmpcfg10_c       : std_ulogic_vector(11 downto 0) := x"3aa";
 
 
 
  constant csr_pmpcfg11_c       : std_ulogic_vector(11 downto 0) := x"3ab";
 
 
 
  constant csr_pmpcfg12_c       : std_ulogic_vector(11 downto 0) := x"3ac";
 
 
 
  constant csr_pmpcfg13_c       : std_ulogic_vector(11 downto 0) := x"3ad";
 
 
 
  constant csr_pmpcfg14_c       : std_ulogic_vector(11 downto 0) := x"3ae";
 
 
 
  constant csr_pmpcfg15_c       : std_ulogic_vector(11 downto 0) := x"3af";
 
 
 
  --
 
 
 
  constant csr_pmpaddr0_c       : std_ulogic_vector(11 downto 0) := x"3b0";
 
 
 
  constant csr_pmpaddr1_c       : std_ulogic_vector(11 downto 0) := x"3b1";
 
 
 
  constant csr_pmpaddr2_c       : std_ulogic_vector(11 downto 0) := x"3b2";
 
 
 
  constant csr_pmpaddr3_c       : std_ulogic_vector(11 downto 0) := x"3b3";
 
 
 
  constant csr_pmpaddr4_c       : std_ulogic_vector(11 downto 0) := x"3b4";
 
 
 
  constant csr_pmpaddr5_c       : std_ulogic_vector(11 downto 0) := x"3b5";
 
 
 
  constant csr_pmpaddr6_c       : std_ulogic_vector(11 downto 0) := x"3b6";
 
 
 
  constant csr_pmpaddr7_c       : std_ulogic_vector(11 downto 0) := x"3b7";
 
 
 
  constant csr_pmpaddr8_c       : std_ulogic_vector(11 downto 0) := x"3b8";
 
 
 
  constant csr_pmpaddr9_c       : std_ulogic_vector(11 downto 0) := x"3b9";
 
 
 
  constant csr_pmpaddr10_c      : std_ulogic_vector(11 downto 0) := x"3ba";
 
 
 
  constant csr_pmpaddr11_c      : std_ulogic_vector(11 downto 0) := x"3bb";
 
 
 
  constant csr_pmpaddr12_c      : std_ulogic_vector(11 downto 0) := x"3bc";
 
 
 
  constant csr_pmpaddr13_c      : std_ulogic_vector(11 downto 0) := x"3bd";
 
 
 
  constant csr_pmpaddr14_c      : std_ulogic_vector(11 downto 0) := x"3be";
 
 
 
  constant csr_pmpaddr15_c      : std_ulogic_vector(11 downto 0) := x"3bf";
 
 
 
  constant csr_pmpaddr16_c      : std_ulogic_vector(11 downto 0) := x"3c0";
 
 
 
  constant csr_pmpaddr17_c      : std_ulogic_vector(11 downto 0) := x"3c1";
 
 
 
  constant csr_pmpaddr18_c      : std_ulogic_vector(11 downto 0) := x"3c2";
 
 
 
  constant csr_pmpaddr19_c      : std_ulogic_vector(11 downto 0) := x"3c3";
 
 
 
  constant csr_pmpaddr20_c      : std_ulogic_vector(11 downto 0) := x"3c4";
 
 
 
  constant csr_pmpaddr21_c      : std_ulogic_vector(11 downto 0) := x"3c5";
 
 
 
  constant csr_pmpaddr22_c      : std_ulogic_vector(11 downto 0) := x"3c6";
 
 
 
  constant csr_pmpaddr23_c      : std_ulogic_vector(11 downto 0) := x"3c7";
 
 
 
  constant csr_pmpaddr24_c      : std_ulogic_vector(11 downto 0) := x"3c8";
 
 
 
  constant csr_pmpaddr25_c      : std_ulogic_vector(11 downto 0) := x"3c9";
 
 
 
  constant csr_pmpaddr26_c      : std_ulogic_vector(11 downto 0) := x"3ca";
 
 
 
  constant csr_pmpaddr27_c      : std_ulogic_vector(11 downto 0) := x"3cb";
 
 
 
  constant csr_pmpaddr28_c      : std_ulogic_vector(11 downto 0) := x"3cc";
 
 
 
  constant csr_pmpaddr29_c      : std_ulogic_vector(11 downto 0) := x"3cd";
 
 
 
  constant csr_pmpaddr30_c      : std_ulogic_vector(11 downto 0) := x"3ce";
 
 
 
  constant csr_pmpaddr31_c      : std_ulogic_vector(11 downto 0) := x"3cf";
 
 
 
  constant csr_pmpaddr32_c      : std_ulogic_vector(11 downto 0) := x"3d0";
 
 
 
  constant csr_pmpaddr33_c      : std_ulogic_vector(11 downto 0) := x"3d1";
 
 
 
  constant csr_pmpaddr34_c      : std_ulogic_vector(11 downto 0) := x"3d2";
 
 
 
  constant csr_pmpaddr35_c      : std_ulogic_vector(11 downto 0) := x"3d3";
 
 
 
  constant csr_pmpaddr36_c      : std_ulogic_vector(11 downto 0) := x"3d4";
 
 
 
  constant csr_pmpaddr37_c      : std_ulogic_vector(11 downto 0) := x"3d5";
 
 
 
  constant csr_pmpaddr38_c      : std_ulogic_vector(11 downto 0) := x"3d6";
 
 
 
  constant csr_pmpaddr39_c      : std_ulogic_vector(11 downto 0) := x"3d7";
 
 
 
  constant csr_pmpaddr40_c      : std_ulogic_vector(11 downto 0) := x"3d8";
 
 
 
  constant csr_pmpaddr41_c      : std_ulogic_vector(11 downto 0) := x"3d9";
 
 
 
  constant csr_pmpaddr42_c      : std_ulogic_vector(11 downto 0) := x"3da";
 
 
 
  constant csr_pmpaddr43_c      : std_ulogic_vector(11 downto 0) := x"3db";
 
 
 
  constant csr_pmpaddr44_c      : std_ulogic_vector(11 downto 0) := x"3dc";
 
 
 
  constant csr_pmpaddr45_c      : std_ulogic_vector(11 downto 0) := x"3dd";
 
 
 
  constant csr_pmpaddr46_c      : std_ulogic_vector(11 downto 0) := x"3de";
 
 
 
  constant csr_pmpaddr47_c      : std_ulogic_vector(11 downto 0) := x"3df";
 
 
 
  constant csr_pmpaddr48_c      : std_ulogic_vector(11 downto 0) := x"3e0";
 
 
 
  constant csr_pmpaddr49_c      : std_ulogic_vector(11 downto 0) := x"3e1";
 
 
 
  constant csr_pmpaddr50_c      : std_ulogic_vector(11 downto 0) := x"3e2";
 
 
 
  constant csr_pmpaddr51_c      : std_ulogic_vector(11 downto 0) := x"3e3";
 
 
 
  constant csr_pmpaddr52_c      : std_ulogic_vector(11 downto 0) := x"3e4";
 
 
 
  constant csr_pmpaddr53_c      : std_ulogic_vector(11 downto 0) := x"3e5";
 
 
 
  constant csr_pmpaddr54_c      : std_ulogic_vector(11 downto 0) := x"3e6";
 
 
 
  constant csr_pmpaddr55_c      : std_ulogic_vector(11 downto 0) := x"3e7";
 
 
 
  constant csr_pmpaddr56_c      : std_ulogic_vector(11 downto 0) := x"3e8";
 
 
 
  constant csr_pmpaddr57_c      : std_ulogic_vector(11 downto 0) := x"3e9";
 
 
 
  constant csr_pmpaddr58_c      : std_ulogic_vector(11 downto 0) := x"3ea";
 
 
 
  constant csr_pmpaddr59_c      : std_ulogic_vector(11 downto 0) := x"3eb";
 
 
 
  constant csr_pmpaddr60_c      : std_ulogic_vector(11 downto 0) := x"3ec";
 
 
 
  constant csr_pmpaddr61_c      : std_ulogic_vector(11 downto 0) := x"3ed";
 
 
 
  constant csr_pmpaddr62_c      : std_ulogic_vector(11 downto 0) := x"3ee";
 
 
 
  constant csr_pmpaddr63_c      : std_ulogic_vector(11 downto 0) := x"3ef";
 
 
 
  --
 
 
 
  constant csr_mcycle_c         : std_ulogic_vector(11 downto 0) := x"b00";
 
 
 
  constant csr_minstret_c       : std_ulogic_vector(11 downto 0) := x"b02";
 
 
 
  --
 
 
 
  constant csr_mhpmcounter3_c   : std_ulogic_vector(11 downto 0) := x"b03";
 
 
 
  constant csr_mhpmcounter4_c   : std_ulogic_vector(11 downto 0) := x"b04";
 
 
 
  constant csr_mhpmcounter5_c   : std_ulogic_vector(11 downto 0) := x"b05";
 
 
 
  constant csr_mhpmcounter6_c   : std_ulogic_vector(11 downto 0) := x"b06";
 
 
 
  constant csr_mhpmcounter7_c   : std_ulogic_vector(11 downto 0) := x"b07";
 
 
 
  constant csr_mhpmcounter8_c   : std_ulogic_vector(11 downto 0) := x"b08";
 
 
 
  constant csr_mhpmcounter9_c   : std_ulogic_vector(11 downto 0) := x"b09";
 
 
 
  constant csr_mhpmcounter10_c  : std_ulogic_vector(11 downto 0) := x"b0a";
 
 
 
  constant csr_mhpmcounter11_c  : std_ulogic_vector(11 downto 0) := x"b0b";
 
 
 
  constant csr_mhpmcounter12_c  : std_ulogic_vector(11 downto 0) := x"b0c";
 
 
 
  constant csr_mhpmcounter13_c  : std_ulogic_vector(11 downto 0) := x"b0d";
 
 
 
  constant csr_mhpmcounter14_c  : std_ulogic_vector(11 downto 0) := x"b0e";
 
 
 
  constant csr_mhpmcounter15_c  : std_ulogic_vector(11 downto 0) := x"b0f";
 
 
 
  constant csr_mhpmcounter16_c  : std_ulogic_vector(11 downto 0) := x"b10";
 
 
 
  constant csr_mhpmcounter17_c  : std_ulogic_vector(11 downto 0) := x"b11";
 
 
 
  constant csr_mhpmcounter18_c  : std_ulogic_vector(11 downto 0) := x"b12";
 
 
 
  constant csr_mhpmcounter19_c  : std_ulogic_vector(11 downto 0) := x"b13";
 
 
 
  constant csr_mhpmcounter20_c  : std_ulogic_vector(11 downto 0) := x"b14";
 
 
 
  constant csr_mhpmcounter21_c  : std_ulogic_vector(11 downto 0) := x"b15";
 
 
 
  constant csr_mhpmcounter22_c  : std_ulogic_vector(11 downto 0) := x"b16";
 
 
 
  constant csr_mhpmcounter23_c  : std_ulogic_vector(11 downto 0) := x"b17";
 
 
 
  constant csr_mhpmcounter24_c  : std_ulogic_vector(11 downto 0) := x"b18";
 
 
 
  constant csr_mhpmcounter25_c  : std_ulogic_vector(11 downto 0) := x"b19";
 
 
 
  constant csr_mhpmcounter26_c  : std_ulogic_vector(11 downto 0) := x"b1a";
 
 
 
  constant csr_mhpmcounter27_c  : std_ulogic_vector(11 downto 0) := x"b1b";
 
 
 
  constant csr_mhpmcounter28_c  : std_ulogic_vector(11 downto 0) := x"b1c";
 
 
 
  constant csr_mhpmcounter29_c  : std_ulogic_vector(11 downto 0) := x"b1d";
 
 
 
  constant csr_mhpmcounter30_c  : std_ulogic_vector(11 downto 0) := x"b1e";
 
 
 
  constant csr_mhpmcounter31_c  : std_ulogic_vector(11 downto 0) := x"b1f";
 
  --
 
  --
 
  constant csr_mcycle_c        : std_ulogic_vector(11 downto 0) := x"b00"; -- mcycle
 
  constant csr_mcycleh_c        : std_ulogic_vector(11 downto 0) := x"b80";
 
  constant csr_minstret_c      : std_ulogic_vector(11 downto 0) := x"b02"; -- minstret
 
  constant csr_minstreth_c      : std_ulogic_vector(11 downto 0) := x"b82";
 
  --
 
  --
 
  constant csr_mcycleh_c       : std_ulogic_vector(11 downto 0) := x"b80"; -- mcycleh
 
  constant csr_mhpmcounter3h_c  : std_ulogic_vector(11 downto 0) := x"b83";
 
  constant csr_minstreth_c     : std_ulogic_vector(11 downto 0) := x"b82"; -- minstreth
 
  constant csr_mhpmcounter4h_c  : std_ulogic_vector(11 downto 0) := x"b84";
 
 
 
  constant csr_mhpmcounter5h_c  : std_ulogic_vector(11 downto 0) := x"b85";
 
 
 
  constant csr_mhpmcounter6h_c  : std_ulogic_vector(11 downto 0) := x"b86";
 
 
 
  constant csr_mhpmcounter7h_c  : std_ulogic_vector(11 downto 0) := x"b87";
 
 
 
  constant csr_mhpmcounter8h_c  : std_ulogic_vector(11 downto 0) := x"b88";
 
 
 
  constant csr_mhpmcounter9h_c  : std_ulogic_vector(11 downto 0) := x"b89";
 
 
 
  constant csr_mhpmcounter10h_c : std_ulogic_vector(11 downto 0) := x"b8a";
 
 
 
  constant csr_mhpmcounter11h_c : std_ulogic_vector(11 downto 0) := x"b8b";
 
 
 
  constant csr_mhpmcounter12h_c : std_ulogic_vector(11 downto 0) := x"b8c";
 
 
 
  constant csr_mhpmcounter13h_c : std_ulogic_vector(11 downto 0) := x"b8d";
 
 
 
  constant csr_mhpmcounter14h_c : std_ulogic_vector(11 downto 0) := x"b8e";
 
 
 
  constant csr_mhpmcounter15h_c : std_ulogic_vector(11 downto 0) := x"b8f";
 
 
 
  constant csr_mhpmcounter16h_c : std_ulogic_vector(11 downto 0) := x"b90";
 
 
 
  constant csr_mhpmcounter17h_c : std_ulogic_vector(11 downto 0) := x"b91";
 
 
 
  constant csr_mhpmcounter18h_c : std_ulogic_vector(11 downto 0) := x"b92";
 
 
 
  constant csr_mhpmcounter19h_c : std_ulogic_vector(11 downto 0) := x"b93";
 
 
 
  constant csr_mhpmcounter20h_c : std_ulogic_vector(11 downto 0) := x"b94";
 
 
 
  constant csr_mhpmcounter21h_c : std_ulogic_vector(11 downto 0) := x"b95";
 
 
 
  constant csr_mhpmcounter22h_c : std_ulogic_vector(11 downto 0) := x"b96";
 
 
 
  constant csr_mhpmcounter23h_c : std_ulogic_vector(11 downto 0) := x"b97";
 
 
 
  constant csr_mhpmcounter24h_c : std_ulogic_vector(11 downto 0) := x"b98";
 
 
 
  constant csr_mhpmcounter25h_c : std_ulogic_vector(11 downto 0) := x"b99";
 
 
 
  constant csr_mhpmcounter26h_c : std_ulogic_vector(11 downto 0) := x"b9a";
 
 
 
  constant csr_mhpmcounter27h_c : std_ulogic_vector(11 downto 0) := x"b9b";
 
 
 
  constant csr_mhpmcounter28h_c : std_ulogic_vector(11 downto 0) := x"b9c";
 
 
 
  constant csr_mhpmcounter29h_c : std_ulogic_vector(11 downto 0) := x"b9d";
 
 
 
  constant csr_mhpmcounter30h_c : std_ulogic_vector(11 downto 0) := x"b9e";
 
 
 
  constant csr_mhpmcounter31h_c : std_ulogic_vector(11 downto 0) := x"b9f";
 
 
 
 
 
  -- read-only CSRs --
 
  -- read-only CSRs --
 
  constant csr_cycle_c         : std_ulogic_vector(11 downto 0) := x"c00"; -- cycle
 
  constant csr_cycle_c          : std_ulogic_vector(11 downto 0) := x"c00";
 
  constant csr_time_c          : std_ulogic_vector(11 downto 0) := x"c01"; -- time
 
  constant csr_time_c           : std_ulogic_vector(11 downto 0) := x"c01";
 
  constant csr_instret_c       : std_ulogic_vector(11 downto 0) := x"c02"; -- instret
 
  constant csr_instret_c        : std_ulogic_vector(11 downto 0) := x"c02";
 
  --
 
  --
 
  constant csr_cycleh_c        : std_ulogic_vector(11 downto 0) := x"c80"; -- cycleh
 
  constant csr_hpmcounter3_c    : std_ulogic_vector(11 downto 0) := x"c03";
 
  constant csr_timeh_c         : std_ulogic_vector(11 downto 0) := x"c81"; -- timeh
 
  constant csr_hpmcounter4_c    : std_ulogic_vector(11 downto 0) := x"c04";
 
  constant csr_instreth_c      : std_ulogic_vector(11 downto 0) := x"c82"; -- instreth
 
  constant csr_hpmcounter5_c    : std_ulogic_vector(11 downto 0) := x"c05";
 
  --
 
  constant csr_hpmcounter6_c    : std_ulogic_vector(11 downto 0) := x"c06";
 
  constant csr_mvendorid_c     : std_ulogic_vector(11 downto 0) := x"f11"; -- mvendorid
 
  constant csr_hpmcounter7_c    : std_ulogic_vector(11 downto 0) := x"c07";
 
  constant csr_marchid_c       : std_ulogic_vector(11 downto 0) := x"f12"; -- marchid
 
  constant csr_hpmcounter8_c    : std_ulogic_vector(11 downto 0) := x"c08";
 
  constant csr_mimpid_c        : std_ulogic_vector(11 downto 0) := x"f13"; -- mimpid
 
  constant csr_hpmcounter9_c    : std_ulogic_vector(11 downto 0) := x"c09";
 
  constant csr_mhartid_c       : std_ulogic_vector(11 downto 0) := x"f14"; -- mhartid
 
  constant csr_hpmcounter10_c   : std_ulogic_vector(11 downto 0) := x"c0a";
 
 
 
  constant csr_hpmcounter11_c   : std_ulogic_vector(11 downto 0) := x"c0b";
 
 
 
  constant csr_hpmcounter12_c   : std_ulogic_vector(11 downto 0) := x"c0c";
 
 
 
  constant csr_hpmcounter13_c   : std_ulogic_vector(11 downto 0) := x"c0d";
 
 
 
  constant csr_hpmcounter14_c   : std_ulogic_vector(11 downto 0) := x"c0e";
 
 
 
  constant csr_hpmcounter15_c   : std_ulogic_vector(11 downto 0) := x"c0f";
 
 
 
  constant csr_hpmcounter16_c   : std_ulogic_vector(11 downto 0) := x"c10";
 
 
 
  constant csr_hpmcounter17_c   : std_ulogic_vector(11 downto 0) := x"c11";
 
 
 
  constant csr_hpmcounter18_c   : std_ulogic_vector(11 downto 0) := x"c12";
 
 
 
  constant csr_hpmcounter19_c   : std_ulogic_vector(11 downto 0) := x"c13";
 
 
 
  constant csr_hpmcounter20_c   : std_ulogic_vector(11 downto 0) := x"c14";
 
 
 
  constant csr_hpmcounter21_c   : std_ulogic_vector(11 downto 0) := x"c15";
 
 
 
  constant csr_hpmcounter22_c   : std_ulogic_vector(11 downto 0) := x"c16";
 
 
 
  constant csr_hpmcounter23_c   : std_ulogic_vector(11 downto 0) := x"c17";
 
 
 
  constant csr_hpmcounter24_c   : std_ulogic_vector(11 downto 0) := x"c18";
 
 
 
  constant csr_hpmcounter25_c   : std_ulogic_vector(11 downto 0) := x"c19";
 
 
 
  constant csr_hpmcounter26_c   : std_ulogic_vector(11 downto 0) := x"c1a";
 
 
 
  constant csr_hpmcounter27_c   : std_ulogic_vector(11 downto 0) := x"c1b";
 
 
 
  constant csr_hpmcounter28_c   : std_ulogic_vector(11 downto 0) := x"c1c";
 
 
 
  constant csr_hpmcounter29_c   : std_ulogic_vector(11 downto 0) := x"c1d";
 
 
 
  constant csr_hpmcounter30_c   : std_ulogic_vector(11 downto 0) := x"c1e";
 
 
 
  constant csr_hpmcounter31_c   : std_ulogic_vector(11 downto 0) := x"c1f";
 
 
 
  --
 
 
 
  constant csr_cycleh_c         : std_ulogic_vector(11 downto 0) := x"c80";
 
 
 
  constant csr_timeh_c          : std_ulogic_vector(11 downto 0) := x"c81";
 
 
 
  constant csr_instreth_c       : std_ulogic_vector(11 downto 0) := x"c82";
 
 
 
  --
 
 
 
  constant csr_hpmcounter3h_c   : std_ulogic_vector(11 downto 0) := x"c83";
 
 
 
  constant csr_hpmcounter4h_c   : std_ulogic_vector(11 downto 0) := x"c84";
 
 
 
  constant csr_hpmcounter5h_c   : std_ulogic_vector(11 downto 0) := x"c85";
 
 
 
  constant csr_hpmcounter6h_c   : std_ulogic_vector(11 downto 0) := x"c86";
 
 
 
  constant csr_hpmcounter7h_c   : std_ulogic_vector(11 downto 0) := x"c87";
 
 
 
  constant csr_hpmcounter8h_c   : std_ulogic_vector(11 downto 0) := x"c88";
 
 
 
  constant csr_hpmcounter9h_c   : std_ulogic_vector(11 downto 0) := x"c89";
 
 
 
  constant csr_hpmcounter10h_c  : std_ulogic_vector(11 downto 0) := x"c8a";
 
 
 
  constant csr_hpmcounter11h_c  : std_ulogic_vector(11 downto 0) := x"c8b";
 
 
 
  constant csr_hpmcounter12h_c  : std_ulogic_vector(11 downto 0) := x"c8c";
 
 
 
  constant csr_hpmcounter13h_c  : std_ulogic_vector(11 downto 0) := x"c8d";
 
 
 
  constant csr_hpmcounter14h_c  : std_ulogic_vector(11 downto 0) := x"c8e";
 
 
 
  constant csr_hpmcounter15h_c  : std_ulogic_vector(11 downto 0) := x"c8f";
 
 
 
  constant csr_hpmcounter16h_c  : std_ulogic_vector(11 downto 0) := x"c90";
 
 
 
  constant csr_hpmcounter17h_c  : std_ulogic_vector(11 downto 0) := x"c91";
 
 
 
  constant csr_hpmcounter18h_c  : std_ulogic_vector(11 downto 0) := x"c92";
 
 
 
  constant csr_hpmcounter19h_c  : std_ulogic_vector(11 downto 0) := x"c93";
 
 
 
  constant csr_hpmcounter20h_c  : std_ulogic_vector(11 downto 0) := x"c94";
 
 
 
  constant csr_hpmcounter21h_c  : std_ulogic_vector(11 downto 0) := x"c95";
 
 
 
  constant csr_hpmcounter22h_c  : std_ulogic_vector(11 downto 0) := x"c96";
 
 
 
  constant csr_hpmcounter23h_c  : std_ulogic_vector(11 downto 0) := x"c97";
 
 
 
  constant csr_hpmcounter24h_c  : std_ulogic_vector(11 downto 0) := x"c98";
 
 
 
  constant csr_hpmcounter25h_c  : std_ulogic_vector(11 downto 0) := x"c99";
 
 
 
  constant csr_hpmcounter26h_c  : std_ulogic_vector(11 downto 0) := x"c9a";
 
 
 
  constant csr_hpmcounter27h_c  : std_ulogic_vector(11 downto 0) := x"c9b";
 
 
 
  constant csr_hpmcounter28h_c  : std_ulogic_vector(11 downto 0) := x"c9c";
 
 
 
  constant csr_hpmcounter29h_c  : std_ulogic_vector(11 downto 0) := x"c9d";
 
 
 
  constant csr_hpmcounter30h_c  : std_ulogic_vector(11 downto 0) := x"c9e";
 
 
 
  constant csr_hpmcounter31h_c  : std_ulogic_vector(11 downto 0) := x"c9f";
 
  --
 
  --
 
  constant csr_mzext_c         : std_ulogic_vector(11 downto 0) := x"fc0"; -- mzext (neorv32-custom)
 
  constant csr_mvendorid_c      : std_ulogic_vector(11 downto 0) := x"f11";
 
 
 
  constant csr_marchid_c        : std_ulogic_vector(11 downto 0) := x"f12";
 
 
 
  constant csr_mimpid_c         : std_ulogic_vector(11 downto 0) := x"f13";
 
 
 
  constant csr_mhartid_c        : std_ulogic_vector(11 downto 0) := x"f14";
 
 
 
 
 
 
 
  -- custom read-only CSRs --
 
 
 
  constant csr_mzext_c          : std_ulogic_vector(11 downto 0) := x"fc0";
 
 
 
 
 
  -- Co-Processor Operations ----------------------------------------------------------------
 
  -- Co-Processor Operations ----------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  -- cp ids --
 
  -- cp ids --
 
  constant cp_sel_muldiv_c : std_ulogic_vector(1 downto 0) := "00"; -- MULDIV
 
  constant cp_sel_muldiv_c : std_ulogic_vector(1 downto 0) := "00"; -- MULDIV
Line 484... Line 701... 
  -- CPU Privilege Modes --------------------------------------------------------------------
 
  -- CPU Privilege Modes --------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  constant priv_mode_m_c : std_ulogic_vector(1 downto 0) := "11"; -- machine mode
 
  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
 
  constant priv_mode_u_c : std_ulogic_vector(1 downto 0) := "00"; -- user mode
 
 
 
 
 
 
 
  -- HPM Event System -----------------------------------------------------------------------
 
 
 
  -- -------------------------------------------------------------------------------------------
 
 
 
  constant hpmcnt_event_cy_c      : natural := 0;  -- Active cycle
 
 
 
  constant hpmcnt_event_never_c   : natural := 1;
 
 
 
  constant hpmcnt_event_ir_c      : natural := 2;  -- Retired instruction
 
 
 
  constant hpmcnt_event_cir_c     : natural := 3;  -- Retired compressed instruction
 
 
 
  constant hpmcnt_event_wait_if_c : natural := 4;  -- Instruction fetch memory wait cycle
 
 
 
  constant hpmcnt_event_wait_ii_c : natural := 5;  -- Instruction issue wait cycle
 
 
 
  constant hpmcnt_event_load_c    : natural := 6;  -- Load operation
 
 
 
  constant hpmcnt_event_store_c   : natural := 7;  -- Store operation
 
 
 
  constant hpmcnt_event_wait_ls_c : natural := 8;  -- Load/store memory wait cycle
 
 
 
  constant hpmcnt_event_jump_c    : natural := 9;  -- Unconditional jump
 
 
 
  constant hpmcnt_event_branch_c  : natural := 10; -- Conditional branch (taken or not taken)
 
 
 
  constant hpmcnt_event_tbranch_c : natural := 11; -- Conditional taken branch
 
 
 
  constant hpmcnt_event_trap_c    : natural := 12; -- Entered trap
 
 
 
  constant hpmcnt_event_illegal_c : natural := 13; -- Illegal instruction exception
 
 
 
  --
 
 
 
  constant hpmcnt_event_size_c    : natural := 14; -- length of this list
 
 
 
 
 
  -- Clock Generator ------------------------------------------------------------------------
 
  -- Clock Generator ------------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  constant clk_div2_c    : natural := 0;
 
  constant clk_div2_c    : natural := 0;
 
  constant clk_div4_c    : natural := 1;
 
  constant clk_div4_c    : natural := 1;
 
  constant clk_div8_c    : natural := 2;
 
  constant clk_div8_c    : natural := 2;
Line 516... Line 752... 
      CPU_EXTENSION_RISCV_Zifencei : boolean := false;  -- implement instruction stream sync.?
 
      CPU_EXTENSION_RISCV_Zifencei : boolean := false;  -- implement instruction stream sync.?
 
      -- Extension Options --
 
      -- Extension Options --
 
      FAST_MUL_EN                  : boolean := false;  -- use DSPs for M extension's multiplier
 
      FAST_MUL_EN                  : boolean := false;  -- use DSPs for M extension's multiplier
 
      FAST_SHIFT_EN                : boolean := false;  -- use barrel shifter for shift operations
 
      FAST_SHIFT_EN                : boolean := false;  -- use barrel shifter for shift operations
 
      -- Physical Memory Protection (PMP) --
 
      -- Physical Memory Protection (PMP) --
 
      PMP_USE                      : boolean := false;  -- implement PMP?
 
      PMP_NUM_REGIONS              : natural := 0;      -- number of regions (0..64)
 
 
 
      PMP_MIN_GRANULARITY          : natural := 64*1024; -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
 
 
 
      -- Hardware Performance Monitors (HPM) --
 
 
 
      HPM_NUM_CNTS                 : natural := 0;      -- number of inmplemnted HPM counters (0..29)
 
      -- Internal Instruction memory --
 
      -- Internal Instruction memory --
 
      MEM_INT_IMEM_USE             : boolean := true;   -- implement processor-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_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
 
      MEM_INT_IMEM_ROM             : boolean := false;  -- implement processor-internal instruction memory as ROM
 
      -- Internal Data memory --
 
      -- Internal Data memory --
Line 606... Line 845... 
      CPU_EXTENSION_RISCV_Zifencei : boolean := true;  -- implement instruction stream sync.?
 
      CPU_EXTENSION_RISCV_Zifencei : boolean := true;  -- implement instruction stream sync.?
 
      -- Extension Options --
 
      -- Extension Options --
 
      FAST_MUL_EN                  : boolean := false; -- use DSPs for M extension's multiplier
 
      FAST_MUL_EN                  : boolean := false; -- use DSPs for M extension's multiplier
 
      FAST_SHIFT_EN                : boolean := false; -- use barrel shifter for shift operations
 
      FAST_SHIFT_EN                : boolean := false; -- use barrel shifter for shift operations
 
      -- Physical Memory Protection (PMP) --
 
      -- Physical Memory Protection (PMP) --
 
      PMP_USE                      : boolean := false  -- implement PMP?
 
      PMP_NUM_REGIONS              : natural := 0; -- number of regions (0..64)
 
 
 
      PMP_MIN_GRANULARITY          : natural := 64*1024; -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
 
 
 
      -- Hardware Performance Monitors (HPM) --
 
 
 
      HPM_NUM_CNTS                 : natural := 0      -- number of inmplemnted HPM counters (0..29)
 
    );
 
    );
 
    port (
 
    port (
 
      -- global control --
 
      -- global control --
 
      clk_i          : in  std_ulogic := '0'; -- global clock, rising edge
 
      clk_i          : in  std_ulogic := '0'; -- global clock, rising edge
 
      rstn_i         : in  std_ulogic := '0'; -- global reset, low-active, async
 
      rstn_i         : in  std_ulogic := '0'; -- global reset, low-active, async
Line 665... Line 907... 
      CPU_EXTENSION_RISCV_M        : boolean := false; -- implement muld/div extension?
 
      CPU_EXTENSION_RISCV_M        : boolean := false; -- implement muld/div extension?
 
      CPU_EXTENSION_RISCV_U        : boolean := false; -- implement user mode extension?
 
      CPU_EXTENSION_RISCV_U        : boolean := false; -- implement user mode extension?
 
      CPU_EXTENSION_RISCV_Zicsr    : boolean := true;  -- implement CSR system?
 
      CPU_EXTENSION_RISCV_Zicsr    : boolean := true;  -- implement CSR system?
 
      CPU_EXTENSION_RISCV_Zifencei : boolean := true;  -- implement instruction stream sync.?
 
      CPU_EXTENSION_RISCV_Zifencei : boolean := true;  -- implement instruction stream sync.?
 
      -- Physical memory protection (PMP) --
 
      -- Physical memory protection (PMP) --
 
      PMP_USE                      : boolean := false  -- implement physical memory protection?
 
      PMP_NUM_REGIONS              : natural := 0; -- number of regions (0..64)
 
 
 
      PMP_MIN_GRANULARITY          : natural := 64*1024; -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
 
 
 
      -- Hardware Performance Monitors (HPM) --
 
 
 
      HPM_NUM_CNTS                 : natural := 0      -- number of inmplemnted HPM counters (0..29)
 
    );
 
    );
 
    port (
 
    port (
 
      -- global control --
 
      -- global control --
 
      clk_i         : in  std_ulogic; -- global clock, rising edge
 
      clk_i         : in  std_ulogic; -- global clock, rising edge
 
      rstn_i        : in  std_ulogic; -- global reset, low-active, async
 
      rstn_i        : in  std_ulogic; -- global reset, low-active, async
Line 795... Line 1040... 
  -- -------------------------------------------------------------------------------------------
 
  -- -------------------------------------------------------------------------------------------
 
  component neorv32_cpu_bus
 
  component neorv32_cpu_bus
 
    generic (
 
    generic (
 
      CPU_EXTENSION_RISCV_C : boolean := true;  -- implement compressed extension?
 
      CPU_EXTENSION_RISCV_C : boolean := true;  -- implement compressed extension?
 
      -- Physical memory protection (PMP) --
 
      -- Physical memory protection (PMP) --
 
      PMP_USE               : boolean := false; -- implement physical memory protection?
 
      PMP_NUM_REGIONS       : natural := 0;       -- number of regions (0..64)
 
 
 
      PMP_MIN_GRANULARITY   : natural := 64*1024; -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
 
      -- Bus Timeout --
 
      -- Bus Timeout --
 
      BUS_TIMEOUT           : natural := 63     -- cycles after an UNACKNOWLEDGED bus access triggers a bus fault exception
 
      BUS_TIMEOUT           : natural := 63     -- cycles after an UNACKNOWLEDGED bus access triggers a bus fault exception
 
    );
 
    );
 
    port (
 
    port (
 
      -- global control --
 
      -- global control --

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