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architecture neorv32_top_rtl of neorv32_top is
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architecture neorv32_top_rtl of neorv32_top is
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-- CPU boot address --
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-- CPU boot address --
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constant cpu_boot_addr_c : std_ulogic_vector(31 downto 0) := cond_sel_stdulogicvector_f(BOOTLOADER_USE, boot_rom_base_c, ispace_base_c);
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constant cpu_boot_addr_c : std_ulogic_vector(31 downto 0) := cond_sel_stdulogicvector_f(BOOTLOADER_USE, boot_rom_base_c, ispace_base_c);
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-- alignment check for internal memories --
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constant imem_align_check_c : std_ulogic_vector(index_size_f(MEM_INT_IMEM_SIZE)-1 downto 0) := (others => '0');
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constant dmem_align_check_c : std_ulogic_vector(index_size_f(MEM_INT_DMEM_SIZE)-1 downto 0) := (others => '0');
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-- reset generator --
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-- reset generator --
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signal rstn_i_sync0 : std_ulogic;
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signal rstn_i_sync0 : std_ulogic;
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signal rstn_i_sync1 : std_ulogic;
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signal rstn_i_sync1 : std_ulogic;
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signal rstn_i_sync2 : std_ulogic;
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signal rstn_i_sync2 : std_ulogic;
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signal rstn_gen : std_ulogic_vector(3 downto 0);
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signal rstn_gen : std_ulogic_vector(3 downto 0);
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assert not ((BOOTLOADER_USE = true) and (boot_rom_size_c > boot_rom_max_size_c)) report "NEORV32 PROCESSOR CONFIG ERROR! Boot ROM size out of range." severity error;
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assert not ((BOOTLOADER_USE = true) and (boot_rom_size_c > boot_rom_max_size_c)) report "NEORV32 PROCESSOR CONFIG ERROR! Boot ROM size out of range." severity error;
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assert not ((BOOTLOADER_USE = true) and (MEM_INT_IMEM_ROM = true)) report "NEORV32 PROCESSOR CONFIG WARNING! IMEM is configured as read-only. Bootloader will not be able to load new executables." severity warning;
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assert not ((BOOTLOADER_USE = true) and (MEM_INT_IMEM_ROM = true)) report "NEORV32 PROCESSOR CONFIG WARNING! IMEM is configured as read-only. Bootloader will not be able to load new executables." severity warning;
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-- memory system - data/instruction fetch --
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-- memory system - data/instruction fetch --
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assert not ((MEM_EXT_USE = false) and (MEM_INT_DMEM_USE = false)) report "NEORV32 PROCESSOR CONFIG ERROR! Core cannot fetch data without external memory interface and internal data memory." severity error;
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assert not ((MEM_EXT_USE = false) and (MEM_INT_DMEM_USE = false)) report "NEORV32 PROCESSOR CONFIG ERROR! Core cannot fetch data without external memory interface and internal data memory." severity error;
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assert not ((MEM_EXT_USE = false) and (MEM_INT_IMEM_USE = false) and (BOOTLOADER_USE = false)) report "NEORV32 PROCESSOR CONFIG ERROR! Core cannot fetch instructions without external memory interface, internal data memory and bootloader." severity error;
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assert not ((MEM_EXT_USE = false) and (MEM_INT_IMEM_USE = false) and (BOOTLOADER_USE = false)) report "NEORV32 PROCESSOR CONFIG ERROR! Core cannot fetch instructions without external memory interface, internal data memory and bootloader." severity error;
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-- memory system --
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-- memory system - alignment --
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assert not (imem_base_c(1 downto 0) /= "00") report "NEORV32 PROCESSOR CONFIG ERROR! Instruction memory space base address must be 4-byte-aligned." severity error;
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assert not (ispace_base_c(1 downto 0) /= "00") report "NEORV32 PROCESSOR CONFIG ERROR! Instruction memory space base address must be 4-byte-aligned." severity error;
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assert not (dmem_base_c(1 downto 0) /= "00") report "NEORV32 PROCESSOR CONFIG ERROR! Data memory space base address must be 4-byte-aligned." severity error;
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assert not (dspace_base_c(1 downto 0) /= "00") report "NEORV32 PROCESSOR CONFIG ERROR! Data memory space base address must be 4-byte-aligned." severity error;
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assert not ((ispace_base_c(index_size_f(MEM_INT_IMEM_SIZE)-1 downto 0) /= imem_align_check_c) and (MEM_INT_IMEM_USE = true)) report "NEORV32 PROCESSOR CONFIG ERROR! Instruction memory space base address has to be aligned to IMEM size." severity error;
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assert not ((dspace_base_c(index_size_f(MEM_INT_DMEM_SIZE)-1 downto 0) /= dmem_align_check_c) and (MEM_INT_DMEM_USE = true)) report "NEORV32 PROCESSOR CONFIG ERROR! Data memory space base address has to be aligned to DMEM size." severity error;
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-- memory system - max latency --
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assert not (MEM_EXT_TIMEOUT < 1) report "NEORV32 PROCESSOR CONFIG ERROR! Invalid bus timeout. Processor-internal components have 1 cycle latency." severity error;
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assert not (MEM_EXT_TIMEOUT < 1) report "NEORV32 PROCESSOR CONFIG ERROR! Invalid bus timeout. Processor-internal components have 1 cycle latency." severity error;
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-- clock --
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-- clock --
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assert not (CLOCK_FREQUENCY = 0) report "NEORV32 PROCESSOR CONFIG ERROR! Core clock frequency (CLOCK_FREQUENCY) not specified." severity error;
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assert not (CLOCK_FREQUENCY = 0) report "NEORV32 PROCESSOR CONFIG ERROR! Core clock frequency (CLOCK_FREQUENCY) not specified." severity error;
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-- memory layout notifier --
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-- memory layout notifier --
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assert not (imem_base_c /= x"00000000") report "NEORV32 PROCESSOR CONFIG WARNING! Non-default base address for instruction address space. Make sure this is sync with the software framework." severity warning;
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assert not (ispace_base_c /= x"00000000") report "NEORV32 PROCESSOR CONFIG WARNING! Non-default base address for instruction address space. Make sure this is sync with the software framework." severity warning;
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assert not (dmem_base_c /= x"80000000") report "NEORV32 PROCESSOR CONFIG WARNING! Non-default base address for data address space. Make sure this is sync with the software framework." severity warning;
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assert not (dspace_base_c /= x"80000000") report "NEORV32 PROCESSOR CONFIG WARNING! Non-default base address for data address space. Make sure this is sync with the software framework." severity warning;
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-- Reset Generator ------------------------------------------------------------------------
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-- Reset Generator ------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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reset_generator_sync: process(clk_i)
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reset_generator_sync: process(clk_i)
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