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entity neorv32_cpu is
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entity neorv32_cpu is
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generic (
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generic (
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-- General --
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-- General --
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HW_THREAD_ID : std_ulogic_vector(31 downto 0):= (others => '0'); -- hardware thread id
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HW_THREAD_ID : std_ulogic_vector(31 downto 0):= (others => '0'); -- hardware thread id
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CPU_BOOT_ADDR : std_ulogic_vector(31 downto 0):= (others => '0'); -- cpu boot address
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CPU_BOOT_ADDR : std_ulogic_vector(31 downto 0):= (others => '0'); -- cpu boot address
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BUS_TIMEOUT : natural := 63; -- cycles after an UNACKNOWLEDGED bus access triggers a bus fault exception
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-- RISC-V CPU Extensions --
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-- RISC-V CPU Extensions --
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CPU_EXTENSION_RISCV_A : boolean := false; -- implement atomic extension?
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CPU_EXTENSION_RISCV_A : boolean := false; -- implement atomic extension?
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CPU_EXTENSION_RISCV_C : boolean := false; -- implement compressed extension?
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CPU_EXTENSION_RISCV_C : boolean := false; -- implement compressed extension?
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CPU_EXTENSION_RISCV_E : boolean := false; -- implement embedded RF extension?
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CPU_EXTENSION_RISCV_E : boolean := false; -- implement embedded RF extension?
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CPU_EXTENSION_RISCV_M : boolean := false; -- implement muld/div extension?
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CPU_EXTENSION_RISCV_M : boolean := false; -- implement muld/div extension?
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begin
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begin
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-- Sanity Checks --------------------------------------------------------------------------
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-- Sanity Checks --------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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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/machine 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_USE = true)) report "NEORV32 CPU CONFIG ERROR! Physical memory protection (PMP) requires CPU_EXTENSION_RISCV_Zicsr extension." severity error;
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-- RISC-V standard performance counters -
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assert not ((CPU_EXTENSION_RISCV_Zicsr = true) and (zicnt_en_c = false)) report "NEORV32 CPU CONFIG WARNING! Standard RISC-V peformance counters ([m]cycle[h], [m]instret[h]) will not be implemented (not RISC-V-compliant!)." severity warning;
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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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-- 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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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_c < 8) and (PMP_USE = true)) 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_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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-- 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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generic map (
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generic map (
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-- General --
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-- General --
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-- -------------------------------------------------------------------------------------------
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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_USE => PMP_USE, -- implement physical memory protection?
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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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)
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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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