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entity neorv32_sysinfo is
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entity neorv32_sysinfo 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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CLOCK_FREQUENCY : natural; -- clock frequency of clk_i in Hz
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CLOCK_FREQUENCY : natural; -- clock frequency of clk_i in Hz
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INT_BOOTLOADER_EN : boolean; -- boot configuration: true = boot explicit bootloader; false = boot from int/ext (I)MEM
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INT_BOOTLOADER_EN : boolean; -- boot configuration: true = boot explicit bootloader; false = boot from int/ext (I)MEM
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USER_CODE : std_ulogic_vector(31 downto 0) := x"00000000"; -- custom user code
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-- RISC-V CPU Extensions --
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CPU_EXTENSION_RISCV_Zbb : boolean; -- implement basic bit-manipulation sub-extension?
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CPU_EXTENSION_RISCV_Zfinx : boolean; -- implement 32-bit floating-point extension (using INT reg!)
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CPU_EXTENSION_RISCV_Zicsr : boolean; -- implement CSR system?
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CPU_EXTENSION_RISCV_Zifencei : boolean; -- implement instruction stream sync.?
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CPU_EXTENSION_RISCV_Zmmul : boolean; -- implement multiply-only M sub-extension?
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CPU_EXTENSION_RISCV_DEBUG : boolean; -- implement CPU debug mode?
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-- Extension Options --
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FAST_MUL_EN : boolean; -- use DSPs for M extension's multiplier
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FAST_SHIFT_EN : boolean; -- use barrel shifter for shift operations
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CPU_CNT_WIDTH : natural; -- total width of CPU cycle and instret counters (0..64)
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-- Physical memory protection (PMP) --
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PMP_NUM_REGIONS : natural; -- number of regions (0..64)
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-- Hardware Performance Monitors (HPM) --
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HPM_NUM_CNTS : natural; -- number of implemented HPM counters (0..29)
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-- Internal Instruction memory --
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-- Internal Instruction memory --
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MEM_INT_IMEM_EN : boolean; -- implement processor-internal instruction memory
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MEM_INT_IMEM_EN : boolean; -- implement processor-internal instruction memory
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MEM_INT_IMEM_SIZE : natural; -- size of processor-internal instruction memory in bytes
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MEM_INT_IMEM_SIZE : natural; -- size of processor-internal instruction memory in bytes
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-- Internal Data memory --
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-- Internal Data memory --
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MEM_INT_DMEM_EN : boolean; -- implement processor-internal data memory
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MEM_INT_DMEM_EN : boolean; -- implement processor-internal data memory
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- SYSINFO(0): Processor (primary) clock frequency --
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-- SYSINFO(0): Processor (primary) clock frequency --
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sysinfo_mem(0) <= std_ulogic_vector(to_unsigned(CLOCK_FREQUENCY, 32));
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sysinfo_mem(0) <= std_ulogic_vector(to_unsigned(CLOCK_FREQUENCY, 32));
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-- SYSINFO(1): Custom user code/ID --
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-- SYSINFO(1): CPU configuration --
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sysinfo_mem(1) <= USER_CODE;
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sysinfo_mem(1)(00) <= bool_to_ulogic_f(CPU_EXTENSION_RISCV_Zicsr); -- Zicsr
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sysinfo_mem(1)(01) <= bool_to_ulogic_f(CPU_EXTENSION_RISCV_Zifencei); -- Zifencei
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sysinfo_mem(1)(02) <= bool_to_ulogic_f(CPU_EXTENSION_RISCV_Zmmul); -- Zmmul
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sysinfo_mem(1)(03) <= bool_to_ulogic_f(CPU_EXTENSION_RISCV_Zbb); -- Zbb
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--
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sysinfo_mem(1)(04) <= '0'; -- reserved
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--
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sysinfo_mem(1)(05) <= bool_to_ulogic_f(CPU_EXTENSION_RISCV_Zfinx); -- Zfinx ("F-alternative")
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sysinfo_mem(1)(07 downto 06) <= "00" when (CPU_CNT_WIDTH = 64) else "10" when (CPU_CNT_WIDTH = 0) else "01"; -- CPU counter size: Zxscnt | Zxnocnt
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sysinfo_mem(1)(08) <= bool_to_ulogic_f(boolean(PMP_NUM_REGIONS > 0)); -- PMP (physical memory protection)
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sysinfo_mem(1)(09) <= bool_to_ulogic_f(boolean(HPM_NUM_CNTS > 0)); -- HPM (hardware performance monitors)
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sysinfo_mem(1)(10) <= bool_to_ulogic_f(CPU_EXTENSION_RISCV_DEBUG); -- RISC-V debug mode
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--
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sysinfo_mem(1)(29 downto 11) <= (others => '0'); -- reserved
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-- misc --
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sysinfo_mem(1)(30) <= bool_to_ulogic_f(FAST_MUL_EN); -- DSP-based multiplication (M extension only)
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sysinfo_mem(1)(31) <= bool_to_ulogic_f(FAST_SHIFT_EN); -- parallel logic for shifts (like barrel shifters)
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-- SYSINFO(2): Implemented processor devices/features --
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-- SYSINFO(2): Implemented processor devices/features --
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-- Memory --
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-- Memory --
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sysinfo_mem(2)(00) <= bool_to_ulogic_f(INT_BOOTLOADER_EN); -- processor-internal bootloader implemented?
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sysinfo_mem(2)(00) <= bool_to_ulogic_f(INT_BOOTLOADER_EN); -- processor-internal bootloader implemented?
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sysinfo_mem(2)(01) <= bool_to_ulogic_f(MEM_EXT_EN); -- external memory bus interface implemented?
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sysinfo_mem(2)(01) <= bool_to_ulogic_f(MEM_EXT_EN); -- external memory bus interface implemented?
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