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-- #################################################################################################
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-- #################################################################################################
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-- # << NEORV32 - CPU Top Entity >> #
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-- # << NEORV32 - CPU Top Entity >> #
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-- # ********************************************************************************************* #
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-- # ********************************************************************************************* #
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-- # Top NEORV32 CPU: #
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-- # NEORV32 CPU: #
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-- # * neorv32_cpu.vhd : CPU top entity #
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-- # * neorv32_cpu.vhd : CPU top entity #
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-- # * neorv32_cpu_alu.vhd : Arithmetic/logic unit #
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-- # * neorv32_cpu_alu.vhd : Arithmetic/logic unit #
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-- # * neorv32_cpu_bus.vhd : Instruction and data bus interface unit #
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-- # * neorv32_cpu_bus.vhd : Instruction and data bus interface unit #
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-- # * neorv32_cpu_cp_muldiv.vhd : MULDIV co-processor #
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-- # * neorv32_cpu_cp_muldiv.vhd : MULDIV co-processor #
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-- # * neorv32_cpu_ctrl.vhd : CPU control and CSR system #
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-- # * neorv32_cpu_ctrl.vhd : CPU control and CSR system #
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-- # * neorv32_cpu_decompressor.vhd : Compressed instructions decoder #
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-- # * neorv32_cpu_decompressor.vhd : Compressed instructions decoder #
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-- # * neorv32_cpu_regfile.vhd : Data register file #
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-- # * neorv32_cpu_regfile.vhd : Data register file #
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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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-- CSR system --
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-- CSR system --
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if (CPU_EXTENSION_RISCV_Zicsr = false) then
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if (CPU_EXTENSION_RISCV_Zicsr = false) then
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assert false report "NEORV32 CONFIG WARNING! No exception/interrupt/machine features available when CPU_EXTENSION_RISCV_Zicsr = false." severity warning;
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assert false report "NEORV32 CPU CONFIG WARNING! No exception/interrupt/machine features available when CPU_EXTENSION_RISCV_Zicsr = false." severity warning;
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end if;
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end if;
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-- U-extension requires Zicsr extension --
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-- U-extension requires Zicsr extension --
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if (CPU_EXTENSION_RISCV_Zicsr = false) and (CPU_EXTENSION_RISCV_U = true) then
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if (CPU_EXTENSION_RISCV_Zicsr = false) and (CPU_EXTENSION_RISCV_U = true) then
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assert false report "NEORV32 CONFIG ERROR! User mode requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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assert false report "NEORV32 CPU CONFIG ERROR! User mode requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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end if;
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end if;
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-- PMP requires Zicsr extension --
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-- PMP requires Zicsr extension --
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if (CPU_EXTENSION_RISCV_Zicsr = false) and (PMP_USE = true) then
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if (CPU_EXTENSION_RISCV_Zicsr = false) and (PMP_USE = true) then
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assert false report "NEORV32 CONFIG ERROR! Physical memory protection (PMP) requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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assert false report "NEORV32 CPU CONFIG ERROR! Physical memory protection (PMP) requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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end if;
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end if;
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-- performance counters require Zicsr extension --
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-- performance counters require Zicsr extension --
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if (CPU_EXTENSION_RISCV_Zicsr = false) and (CSR_COUNTERS_USE = true) then
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if (CPU_EXTENSION_RISCV_Zicsr = false) and (CSR_COUNTERS_USE = true) then
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assert false report "NEORV32 CONFIG ERROR! Performance counter CSRs require CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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assert false report "NEORV32 CPU CONFIG ERROR! Performance counter CSRs require CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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end if;
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end if;
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-- PMP regions --
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-- PMP regions --
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if (PMP_NUM_REGIONS > pmp_max_r_c) and (PMP_USE = true) then
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if (PMP_NUM_REGIONS > pmp_max_r_c) and (PMP_USE = true) then
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assert false report "NEORV32 CONFIG ERROR! Number of PMP regions out of valid range." severity error;
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assert false report "NEORV32 CPU CONFIG ERROR! Number of PMP regions out of valid range." severity error;
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end if;
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end if;
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-- PMP granulartiy --
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-- PMP granulartiy --
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if ((PMP_GRANULARITY < 1) or (PMP_GRANULARITY > 32)) and (PMP_USE = true) then
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if ((PMP_GRANULARITY < 1) or (PMP_GRANULARITY > 32)) and (PMP_USE = true) then
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assert false report "NEORV32 CONFIG ERROR! Invalid PMP granulartiy (0 < G < 33)." severity error;
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assert false report "NEORV32 CPU CONFIG ERROR! Invalid PMP granulartiy (0 < G < 33)." severity error;
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end if;
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-- Bus timeout --
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if (BUS_TIMEOUT < 1) then
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assert false report "NEORV32 CPU CONFIG ERROR! Invalid bus timeout - must be at least 1 cycle." 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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end process sanity_check;
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end process sanity_check;
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-- Control Unit ---------------------------------------------------------------------------
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-- Control Unit ---------------------------------------------------------------------------
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