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-- # #
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-- # #
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-- # Check out the processor's data sheet for more information: docs/NEORV32.pdf #
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-- # Check out the processor's data sheet 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) 2021, Stephan Nolting. All rights reserved. #
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-- # #
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-- # #
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-- # Redistribution and use in source and binary forms, with or without modification, are #
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-- # Redistribution and use in source and binary forms, with or without modification, are #
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-- # permitted provided that the following conditions are met: #
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-- # permitted provided that the following conditions are met: #
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-- # #
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-- # #
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-- # 1. Redistributions of source code must retain the above copyright notice, this list of #
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-- # 1. Redistributions of source code must retain the above copyright notice, this list of #
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| Line 68... |
Line 68... |
CPU_EXTENSION_RISCV_Zifencei : boolean := true; -- implement instruction stream sync.?
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CPU_EXTENSION_RISCV_Zifencei : boolean := true; -- implement instruction stream sync.?
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-- Extension Options --
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-- Extension Options --
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FAST_MUL_EN : boolean := false; -- use DSPs for M extension's multiplier
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FAST_MUL_EN : boolean := false; -- use DSPs for M extension's multiplier
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FAST_SHIFT_EN : boolean := false; -- use barrel shifter for shift operations
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FAST_SHIFT_EN : boolean := false; -- use barrel shifter for shift operations
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-- Physical Memory Protection (PMP) --
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-- Physical Memory Protection (PMP) --
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PMP_USE : boolean := false -- implement PMP?
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PMP_NUM_REGIONS : natural := 0; -- number of regions (0..64)
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PMP_MIN_GRANULARITY : natural := 64*1024; -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
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-- Hardware Performance Monitors (HPM) --
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HPM_NUM_CNTS : natural := 0 -- number of inmplemnted HPM counters (0..29)
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);
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);
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port (
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port (
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-- global control --
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-- global control --
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clk_i : in std_ulogic := '0'; -- global clock, rising edge
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clk_i : in std_ulogic := '0'; -- global clock, rising edge
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rstn_i : in std_ulogic := '0'; -- global reset, low-active, async
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rstn_i : in std_ulogic := '0'; -- global reset, low-active, async
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-- CSR system --
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-- CSR system --
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assert not (CPU_EXTENSION_RISCV_Zicsr = false) report "NEORV32 CPU CONFIG WARNING! No exception/interrupt/trap/privileged features available when CPU_EXTENSION_RISCV_Zicsr = false." severity warning;
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assert not (CPU_EXTENSION_RISCV_Zicsr = false) report "NEORV32 CPU CONFIG WARNING! No exception/interrupt/trap/privileged features available when CPU_EXTENSION_RISCV_Zicsr = false." severity warning;
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-- U-extension requires Zicsr extension --
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-- U-extension requires Zicsr extension --
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assert not ((CPU_EXTENSION_RISCV_Zicsr = false) and (CPU_EXTENSION_RISCV_U = true)) report "NEORV32 CPU CONFIG ERROR! User mode requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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assert not ((CPU_EXTENSION_RISCV_Zicsr = false) and (CPU_EXTENSION_RISCV_U = true)) report "NEORV32 CPU CONFIG ERROR! User mode requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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-- PMP requires Zicsr extension --
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-- PMP requires Zicsr extension --
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assert not ((CPU_EXTENSION_RISCV_Zicsr = false) and (PMP_USE = true)) report "NEORV32 CPU CONFIG ERROR! Physical memory protection (PMP) requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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assert not ((CPU_EXTENSION_RISCV_Zicsr = false) and (PMP_NUM_REGIONS > 0)) report "NEORV32 CPU CONFIG ERROR! Physical memory protection (PMP) requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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-- HPM CNT requires Zicsr extension --
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assert not ((CPU_EXTENSION_RISCV_Zicsr = false) and (HPM_NUM_CNTS > 0)) report "NEORV32 CPU CONFIG ERROR! Performance monitors (HMP) require CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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-- Bus timeout --
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-- Bus timeout --
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assert not (BUS_TIMEOUT < 2) report "NEORV32 CPU CONFIG ERROR! Invalid bus access timeout value <BUS_TIMEOUT>. Has to be >= 2." severity error;
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assert not (BUS_TIMEOUT < 2) report "NEORV32 CPU CONFIG ERROR! Invalid bus access timeout value <BUS_TIMEOUT>. Has to be >= 2." severity error;
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-- Instruction prefetch buffer size --
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-- Instruction prefetch buffer size --
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assert not (is_power_of_two_f(ipb_entries_c) = false) report "NEORV32 CPU CONFIG ERROR! Number of entries in instruction prefetch buffer <ipb_entries_c> has to be a power of two." severity error;
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assert not (is_power_of_two_f(ipb_entries_c) = false) report "NEORV32 CPU CONFIG ERROR! Number of entries in instruction prefetch buffer <ipb_entries_c> has to be a power of two." severity error;
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-- A extension - only lr.w and sc.w supported yet --
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-- A extension - only lr.w and sc.w supported yet --
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assert not (CPU_EXTENSION_RISCV_A = true) report "NEORV32 CPU CONFIG WARNING! Atomic operations extension (A) only supports >lr.w< and >sc.w< instructions yet." severity warning;
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assert not (CPU_EXTENSION_RISCV_A = true) report "NEORV32 CPU CONFIG WARNING! Atomic operations extension (A) only supports >lr.w< and >sc.w< instructions yet." severity warning;
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-- PMP regions check --
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-- PMP regions check --
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assert not ((pmp_num_regions_c > pmp_max_r_c) and (PMP_USE = true)) report "NEORV32 CPU CONFIG ERROR! Number of PMP regions <pmp_num_regions_c> out of valid range." severity error;
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assert not (PMP_NUM_REGIONS > 64) report "NEORV32 CPU CONFIG ERROR! Number of PMP regions <PMP_NUM_REGIONS> out of valid range (0..64)." severity error;
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-- PMP granulartiy --
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-- PMP granulartiy --
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assert not ((is_power_of_two_f(pmp_min_granularity_c) = false) and (PMP_USE = true)) report "NEORV32 CPU CONFIG ERROR! PMP granulartiy has to be a power of two." severity error;
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assert not ((is_power_of_two_f(PMP_MIN_GRANULARITY) = false) and (PMP_NUM_REGIONS > 0)) report "NEORV32 CPU CONFIG ERROR! PMP granulartiy has to be a power of two." severity error;
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assert not ((pmp_min_granularity_c < 8) and (PMP_USE = true)) report "NEORV32 CPU CONFIG ERROR! PMP granulartiy has to be >= 8 bytes." severity error;
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assert not ((PMP_MIN_GRANULARITY < 8) and (PMP_NUM_REGIONS > 0)) report "NEORV32 CPU CONFIG ERROR! PMP granulartiy has to be >= 8 bytes." severity error;
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-- PMP notifier --
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-- PMP notifier --
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assert not (PMP_USE = true) report "NEORV32 CPU CONFIG NOTE: Implementing physical memory protection (PMP) with " & integer'image(pmp_num_regions_c) & " regions and " & integer'image(pmp_min_granularity_c) & " bytes minimal region size (granulartiy)." severity note;
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assert not (PMP_NUM_REGIONS > 0) report "NEORV32 CPU CONFIG NOTE: Implementing physical memory protection (PMP) with " & integer'image(PMP_NUM_REGIONS) & " regions and a minimal granularity of " & integer'image(PMP_MIN_GRANULARITY) & " bytes." severity note;
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-- HPM counters check --
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assert not (HPM_NUM_CNTS > 29) report "NEORV32 CPU CONFIG ERROR! Number of HPM counters <HPM_NUM_CNTS> out of valid range (0..29)." severity error;
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-- HPM counters notifier --
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assert not (HPM_NUM_CNTS > 0) report "NEORV32 CPU CONFIG NOTE: Implementing " & integer'image(HPM_NUM_CNTS) & " HPM counters." severity note;
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-- Control Unit ---------------------------------------------------------------------------
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-- Control Unit ---------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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neorv32_cpu_control_inst: neorv32_cpu_control
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neorv32_cpu_control_inst: neorv32_cpu_control
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CPU_EXTENSION_RISCV_M => CPU_EXTENSION_RISCV_M, -- implement muld/div extension?
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CPU_EXTENSION_RISCV_M => CPU_EXTENSION_RISCV_M, -- implement muld/div extension?
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CPU_EXTENSION_RISCV_U => CPU_EXTENSION_RISCV_U, -- implement user mode extension?
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CPU_EXTENSION_RISCV_U => CPU_EXTENSION_RISCV_U, -- implement user mode extension?
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CPU_EXTENSION_RISCV_Zicsr => CPU_EXTENSION_RISCV_Zicsr, -- implement CSR system?
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CPU_EXTENSION_RISCV_Zicsr => CPU_EXTENSION_RISCV_Zicsr, -- implement CSR system?
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CPU_EXTENSION_RISCV_Zifencei => CPU_EXTENSION_RISCV_Zifencei, -- implement instruction stream sync.?
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CPU_EXTENSION_RISCV_Zifencei => CPU_EXTENSION_RISCV_Zifencei, -- implement instruction stream sync.?
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-- Physical memory protection (PMP) --
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-- Physical memory protection (PMP) --
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PMP_USE => PMP_USE -- implement physical memory protection?
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PMP_NUM_REGIONS => PMP_NUM_REGIONS, -- number of regions (0..64)
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PMP_MIN_GRANULARITY => PMP_MIN_GRANULARITY, -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
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-- Hardware Performance Monitors (HPM) --
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HPM_NUM_CNTS => HPM_NUM_CNTS -- number of inmplemnted HPM counters (0..29)
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)
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)
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port map (
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port map (
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-- global control --
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-- global control --
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clk_i => clk_i, -- global clock, rising edge
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clk_i => clk_i, -- global clock, rising edge
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rstn_i => rstn_i, -- global reset, low-active, async
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rstn_i => rstn_i, -- global reset, low-active, async
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Line 380... |
-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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neorv32_cpu_bus_inst: neorv32_cpu_bus
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neorv32_cpu_bus_inst: neorv32_cpu_bus
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generic map (
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generic map (
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CPU_EXTENSION_RISCV_C => CPU_EXTENSION_RISCV_C, -- implement compressed extension?
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CPU_EXTENSION_RISCV_C => CPU_EXTENSION_RISCV_C, -- implement compressed extension?
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-- Physical memory protection (PMP) --
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-- Physical memory protection (PMP) --
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PMP_USE => PMP_USE, -- implement physical memory protection?
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PMP_NUM_REGIONS => PMP_NUM_REGIONS, -- number of regions (0..64)
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PMP_MIN_GRANULARITY => PMP_MIN_GRANULARITY, -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
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-- Bus Timeout --
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-- Bus Timeout --
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BUS_TIMEOUT => BUS_TIMEOUT -- cycles after an UNACKNOWLEDGED bus access triggers a bus fault exception
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BUS_TIMEOUT => BUS_TIMEOUT -- cycles after an UNACKNOWLEDGED bus access triggers a bus fault exception
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)
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)
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port map (
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port map (
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-- global control --
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-- global control --
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