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-- #################################################################################################
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-- #################################################################################################
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-- # << NEORV32 - Processor Top Entity >> #
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-- # << NEORV32 - Processor Top Entity >> #
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-- # ********************************************************************************************* #
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-- # ********************************************************************************************* #
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-- # This is the top entity of the NEORV32 Processor. Instantiate this unit in your own project #
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-- # This is the top entity of the NEORV32 PROCESSOR. Instantiate this unit in your own project #
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-- # and define all the configuration generics according to your needs. Alternatively, you can use #
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-- # and define all the configuration generics according to your needs. Alternatively, you can use #
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-- # one of the alternative top entities provided in the "rtl\top_templates" folder. #
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-- # one of the alternative top entities provided in the "rtl/top_templates" folder. #
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-- # Check the processor's documentary for more information: doc\NEORV32.pdf #
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-- # #
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-- # Check the processor's documentary for more information: docs/NEORV32.pdf #
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-- # ********************************************************************************************* #
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-- # ********************************************************************************************* #
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-- # BSD 3-Clause License #
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-- # BSD 3-Clause License #
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-- # #
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-- # #
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-- # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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-- # Copyright (c) 2020, Stephan Nolting. All rights reserved. #
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-- # #
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-- # #
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sanity_check: process(clk_i)
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sanity_check: process(clk_i)
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begin
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begin
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if rising_edge(clk_i) then
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if rising_edge(clk_i) then
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-- internal bootloader memory --
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-- internal bootloader memory --
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if (BOOTLOADER_USE = true) and (boot_size_c > boot_max_size_c) then
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if (BOOTLOADER_USE = true) and (boot_size_c > boot_max_size_c) then
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assert false report "NEORV32 CONFIG ERROR! Boot ROM size out of range." severity error;
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assert false report "NEORV32 PROCESSOR CONFIG ERROR! Boot ROM size out of range." severity error;
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end if;
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end if;
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-- memory system - data/instruction fetch --
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-- memory system - data/instruction fetch --
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if (MEM_EXT_USE = false) then
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if (MEM_EXT_USE = false) then
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if (MEM_INT_DMEM_USE = false) then
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if (MEM_INT_DMEM_USE = false) then
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assert false report "NEORV32 CONFIG ERROR! Core cannot fetch data without external memory interface and internal data memory." severity error;
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assert false report "NEORV32 PROCESSOR CONFIG ERROR! Core cannot fetch data without external memory interface and internal data memory." severity error;
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end if;
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end if;
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if (MEM_INT_IMEM_USE = false) and (BOOTLOADER_USE = false) then
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if (MEM_INT_IMEM_USE = false) and (BOOTLOADER_USE = false) then
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assert false report "NEORV32 CONFIG ERROR! Core cannot fetch instructions without external memory interface, internal data memory and bootloader." severity error;
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assert 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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end if;
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end if;
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end if;
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end if;
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-- memory system --
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-- memory system --
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if (MEM_ISPACE_BASE(1 downto 0) /= "00") then
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assert false report "NEORV32 PROCESSOR CONFIG ERROR! Instruction memory space base address must be 4-byte-aligned." severity error;
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end if;
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if (MEM_DSPACE_BASE(1 downto 0) /= "00") then
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assert false report "NEORV32 PROCESSOR CONFIG ERROR! Data memory space base address must be 4-byte-aligned." severity error;
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end if;
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if (MEM_INT_IMEM_USE = true) and (MEM_INT_IMEM_SIZE > MEM_ISPACE_SIZE) then
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if (MEM_INT_IMEM_USE = true) and (MEM_INT_IMEM_SIZE > MEM_ISPACE_SIZE) then
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assert false report "NEORV32 CONFIG ERROR! Internal instruction memory (IMEM) cannot be greater than total instruction address space." severity error;
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assert false report "NEORV32 PROCESSOR CONFIG ERROR! Internal instruction memory (IMEM) cannot be greater than total instruction address space." severity error;
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end if;
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end if;
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if (MEM_INT_DMEM_USE = true) and (MEM_INT_DMEM_SIZE > MEM_DSPACE_SIZE) then
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if (MEM_INT_DMEM_USE = true) and (MEM_INT_DMEM_SIZE > MEM_DSPACE_SIZE) then
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assert false report "NEORV32 CONFIG ERROR! Internal data memory (DMEM) cannot be greater than total data address space." severity error;
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assert false report "NEORV32 PROCESSOR CONFIG ERROR! Internal data memory (DMEM) cannot be greater than total data address space." severity error;
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end if;
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end if;
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if (MEM_EXT_TIMEOUT < 1) then
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if (MEM_EXT_TIMEOUT < 1) then
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assert false report "NEORV32 CONFIG ERROR! Invalid bus timeout. Processor-internal components have 1 cycle delay." severity error;
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assert false report "NEORV32 PROCESSOR CONFIG ERROR! Invalid bus timeout. Processor-internal components have 1 cycle delay." severity error;
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end if;
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end if;
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-- clock --
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-- clock --
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if (CLOCK_FREQUENCY = 0) then
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if (CLOCK_FREQUENCY = 0) then
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assert false report "NEORV32 CONFIG ERROR! Core clock frequency (CLOCK_FREQUENCY) not specified." severity error;
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assert false report "NEORV32 PROCESSOR CONFIG ERROR! Core clock frequency (CLOCK_FREQUENCY) not specified." severity error;
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end if;
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end if;
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-- memory layout notifier --
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-- memory layout notifier --
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if (MEM_ISPACE_BASE /= x"00000000") then
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if (MEM_ISPACE_BASE /= x"00000000") then
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assert false report "NEORV32 CONFIG WARNING! Non-default base address for instruction address space. Make sure this is sync with the software framwork." severity warning;
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assert false report "NEORV32 PROCESSOR CONFIG WARNING! Non-default base address for instruction address space. Make sure this is sync with the software framwork." severity warning;
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end if;
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end if;
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if (MEM_DSPACE_BASE /= x"80000000") then
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if (MEM_DSPACE_BASE /= x"80000000") then
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assert false report "NEORV32 CONFIG WARNING! Non-default base address for data address space. Make sure this is sync with the software framwork." severity warning;
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assert false report "NEORV32 PROCESSOR CONFIG WARNING! Non-default base address for data address space. Make sure this is sync with the software framwork." severity warning;
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end if;
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end if;
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end if;
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end if;
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end process sanity_check;
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end process sanity_check;
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