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constant xbus_big_endian_c : boolean := true; -- external memory access byte order: true=big endian (default); false=little endian
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constant xbus_big_endian_c : boolean := true; -- external memory access byte order: true=big endian (default); false=little endian
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-- CPU core --
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-- CPU core --
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constant ipb_entries_c : natural := 2; -- entries in CPU instruction prefetch buffer, has to be a power of 2, default=2
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constant ipb_entries_c : natural := 2; -- entries in CPU instruction prefetch buffer, has to be a power of 2, default=2
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-- "critical" number of PMP regions --
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-- "critical" number of implemented PMP regions --
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-- if more PMP regions (> pmp_num_regions_critical_c) are defined, another register stage is automatically
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-- if more PMP regions (> pmp_num_regions_critical_c) are defined, another register stage is automatically inserted into the memory interfaces
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-- inserted into the memory interfaces increasing instruction fetch & data access latency by +1 cycle!
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-- increasing instruction fetch & data access latency by +1 cycle but also reducing critical path length
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constant pmp_num_regions_critical_c : natural := 8;
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constant pmp_num_regions_critical_c : natural := 8; -- default=8
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-- Architecture Constants (do not modify!) ------------------------------------------------
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-- Architecture Constants (do not modify!) ------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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constant data_width_c : natural := 32; -- native data path width - do not change!
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constant data_width_c : natural := 32; -- native data path width - do not change!
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constant hw_version_c : std_ulogic_vector(31 downto 0) := x"01050207"; -- no touchy!
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constant hw_version_c : std_ulogic_vector(31 downto 0) := x"01050208"; -- no touchy!
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constant pmp_max_r_c : natural := 8; -- max PMP regions - FIXED!
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constant pmp_max_r_c : natural := 8; -- max PMP regions - FIXED!
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constant archid_c : natural := 19; -- official NEORV32 architecture ID - hands off!
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constant archid_c : natural := 19; -- official NEORV32 architecture ID - hands off!
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constant rf_r0_is_reg_c : boolean := true; -- reg_file.r0 is a *physical register* that has to be initialized to zero by the CPU HW
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constant rf_r0_is_reg_c : boolean := true; -- reg_file.r0 is a *physical register* that has to be initialized to zero by the CPU HW
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-- Helper Functions -----------------------------------------------------------------------
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-- Helper Functions -----------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- atomic operations --
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-- atomic operations --
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constant funct5_a_lr_c : std_ulogic_vector(4 downto 0) := "00010"; -- LR
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constant funct5_a_lr_c : std_ulogic_vector(4 downto 0) := "00010"; -- LR
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constant funct5_a_sc_c : std_ulogic_vector(4 downto 0) := "00011"; -- SC
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constant funct5_a_sc_c : std_ulogic_vector(4 downto 0) := "00011"; -- SC
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-- RISC-V Floating-Point Formats ----------------------------------------------------------
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-- RISC-V Floating-Point Stuff ------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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constant float_single_c : std_ulogic_vector(1 downto 0) := "00"; -- single-precisions (32-bit)
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-- formats --
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constant float_double_c : std_ulogic_vector(1 downto 0) := "01"; -- double-precisions (64-bit)
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constant float_single_c : std_ulogic_vector(1 downto 0) := "00"; -- single-precision (32-bit)
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constant float_half_c : std_ulogic_vector(1 downto 0) := "10"; -- half-precisions (16-bit)
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constant float_double_c : std_ulogic_vector(1 downto 0) := "01"; -- double-precision (64-bit)
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constant float_quad_c : std_ulogic_vector(1 downto 0) := "11"; -- quad-precisions (64-bit)
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constant float_half_c : std_ulogic_vector(1 downto 0) := "10"; -- half-precision (16-bit)
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constant float_quad_c : std_ulogic_vector(1 downto 0) := "11"; -- quad-precision (128-bit)
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-- number class flags --
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constant fp_class_neg_inf_c : natural := 0; -- negative infinity
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constant fp_class_neg_norm_c : natural := 1; -- negative normal number
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constant fp_class_neg_denorm_c : natural := 2; -- negative subnormal number
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constant fp_class_neg_zero_c : natural := 3; -- negative zero
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constant fp_class_pos_zero_c : natural := 4; -- positive zero
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constant fp_class_pos_denorm_c : natural := 5; -- positive subnormal number
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constant fp_class_pos_norm_c : natural := 6; -- positive normal number
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constant fp_class_pos_inf_c : natural := 7; -- positive infinity
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constant fp_class_snan_c : natural := 8; -- signaling NaN (sNaN)
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constant fp_class_qnan_c : natural := 9; -- quiet NaN (qNaN)
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-- exception flags --
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constant fp_exc_nv_c : natural := 0; -- invalid operation
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constant fp_exc_dz_c : natural := 1; -- divide by zero
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constant fp_exc_of_c : natural := 2; -- overflow
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constant fp_exc_uf_c : natural := 3; -- underflow
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constant fp_exc_nx_c : natural := 4; -- inexact
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-- special values (single-precision) --
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constant fp_single_qnan_c : std_ulogic_vector(31 downto 0) := x"7fc00000"; -- quiet NaN
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constant fp_single_snan_c : std_ulogic_vector(31 downto 0) := x"7fa00000"; -- signaling NaN
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constant fp_single_pos_inf_c : std_ulogic_vector(31 downto 0) := x"7f800000"; -- positive infinity
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constant fp_single_neg_inf_c : std_ulogic_vector(31 downto 0) := x"ff800000"; -- negative infinity
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constant fp_single_pos_zero_c : std_ulogic_vector(31 downto 0) := x"00000000"; -- positive zero
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constant fp_single_neg_zero_c : std_ulogic_vector(31 downto 0) := x"80000000"; -- negative zero
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-- RISC-V CSR Addresses -------------------------------------------------------------------
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-- RISC-V CSR Addresses -------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- -------------------------------------------------------------------------------------------
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-- read/write CSRs --
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-- read/write CSRs --
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constant csr_class_float_c : std_ulogic_vector(07 downto 0) := x"00"; -- floating point
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constant csr_class_float_c : std_ulogic_vector(07 downto 0) := x"00"; -- floating point
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