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library neorv32;
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library neorv32;
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use neorv32.neorv32_package.all;
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use neorv32.neorv32_package.all;
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entity neorv32_cpu_bus is
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entity neorv32_cpu_bus is
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generic (
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generic (
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CPU_EXTENSION_RISCV_A : boolean := false; -- implement atomic extension?
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CPU_EXTENSION_RISCV_A : boolean; -- implement atomic extension?
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CPU_EXTENSION_RISCV_C : boolean := true; -- implement compressed extension?
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CPU_EXTENSION_RISCV_C : boolean; -- implement compressed extension?
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-- Physical memory protection (PMP) --
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-- Physical memory protection (PMP) --
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PMP_NUM_REGIONS : natural := 0; -- number of regions (0..64)
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PMP_NUM_REGIONS : natural; -- 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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PMP_MIN_GRANULARITY : natural -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
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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; -- global clock, rising edge
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clk_i : in std_ulogic; -- 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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constant pmp_cfg_r_c : natural := 0; -- read permit
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constant pmp_cfg_r_c : natural := 0; -- read permit
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constant pmp_cfg_w_c : natural := 1; -- write permit
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constant pmp_cfg_w_c : natural := 1; -- write permit
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constant pmp_cfg_x_c : natural := 2; -- execute permit
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constant pmp_cfg_x_c : natural := 2; -- execute permit
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constant pmp_cfg_al_c : natural := 3; -- mode bit low
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constant pmp_cfg_al_c : natural := 3; -- mode bit low
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constant pmp_cfg_ah_c : natural := 4; -- mode bit high
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constant pmp_cfg_ah_c : natural := 4; -- mode bit high
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--
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constant pmp_cfg_l_c : natural := 7; -- locked entry
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constant pmp_cfg_l_c : natural := 7; -- locked entry
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-- data interface registers --
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-- data interface registers --
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signal mar, mdo, mdi : std_ulogic_vector(data_width_c-1 downto 0);
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signal mar, mdo, mdi : std_ulogic_vector(data_width_c-1 downto 0);
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