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Line 61... |
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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CPU_EXTENSION_RISCV_U : boolean := false; -- implement user mode extension?
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CPU_EXTENSION_RISCV_U : boolean := false; -- implement user mode extension?
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CPU_EXTENSION_RISCV_Zicsr : boolean := true; -- implement CSR system?
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CPU_EXTENSION_RISCV_Zicsr : boolean := true; -- implement CSR system?
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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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CSR_COUNTERS_USE : boolean := true; -- implement RISC-V perf. counters ([m]instret[h], [m]cycle[h], time[h])?
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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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-- 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_USE : boolean := false; -- implement PMP?
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PMP_NUM_REGIONS : natural := 4; -- number of regions (max 8)
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PMP_NUM_REGIONS : natural := 4; -- number of regions (max 8)
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PMP_GRANULARITY : natural := 14; -- minimal region granularity (1=8B, 2=16B, 3=32B, ...) default is 64k
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PMP_GRANULARITY : natural := 14; -- minimal region granularity (1=8B, 2=16B, 3=32B, ...) default is 64k
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Line 146... |
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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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sanity_check: process(clk_i)
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begin
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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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assert not (CPU_EXTENSION_RISCV_Zicsr = false) report "NEORV32 CPU 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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-- 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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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 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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-- 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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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 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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-- 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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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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-- 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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assert not ((PMP_NUM_REGIONS > pmp_max_r_c) and (PMP_USE = true)) report "NEORV32 CPU 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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-- 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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assert not (((PMP_GRANULARITY < 1) or (PMP_GRANULARITY > 32)) and (PMP_USE = true)) report "NEORV32 CPU 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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-- Bus timeout --
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if (BUS_TIMEOUT < 1) then
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assert not (BUS_TIMEOUT < 1) report "NEORV32 CPU CONFIG ERROR! Invalid bus timeout - must be at least 1 cycle." severity error;
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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 process sanity_check;
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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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CSR_COUNTERS_USE => CSR_COUNTERS_USE, -- implement RISC-V perf. counters ([m]instret[h], [m]cycle[h], time[h])?
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HW_THREAD_ID => HW_THREAD_ID, -- hardware thread id
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HW_THREAD_ID => HW_THREAD_ID, -- hardware thread id
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CPU_BOOT_ADDR => CPU_BOOT_ADDR, -- cpu boot address
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CPU_BOOT_ADDR => CPU_BOOT_ADDR, -- cpu boot address
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-- RISC-V CPU Extensions --
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-- RISC-V CPU Extensions --
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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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CPU_EXTENSION_RISCV_E => CPU_EXTENSION_RISCV_E, -- implement embedded RF extension?
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CPU_EXTENSION_RISCV_E => CPU_EXTENSION_RISCV_E, -- implement embedded RF extension?
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