| Line 83... |
Line 83... |
FAST_MUL_EN : boolean; -- use DSPs for M extension's multiplier
|
FAST_MUL_EN : boolean; -- use DSPs for M extension's multiplier
|
FAST_SHIFT_EN : boolean; -- use barrel shifter for shift operations
|
FAST_SHIFT_EN : boolean; -- use barrel shifter for shift operations
|
CPU_CNT_WIDTH : natural; -- total width of CPU cycle and instret counters (0..64)
|
CPU_CNT_WIDTH : natural; -- total width of CPU cycle and instret counters (0..64)
|
CPU_IPB_ENTRIES : natural; -- entries is instruction prefetch buffer, has to be a power of 2
|
CPU_IPB_ENTRIES : natural; -- entries is instruction prefetch buffer, has to be a power of 2
|
-- Physical Memory Protection (PMP) --
|
-- Physical Memory Protection (PMP) --
|
PMP_NUM_REGIONS : natural; -- number of regions (0..64)
|
PMP_NUM_REGIONS : natural; -- number of regions (0..16)
|
PMP_MIN_GRANULARITY : natural; -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
|
PMP_MIN_GRANULARITY : natural; -- minimal region granularity in bytes, has to be a power of 2, min 4 bytes
|
-- Hardware Performance Monitors (HPM) --
|
-- Hardware Performance Monitors (HPM) --
|
HPM_NUM_CNTS : natural; -- number of implemented HPM counters (0..29)
|
HPM_NUM_CNTS : natural; -- number of implemented HPM counters (0..29)
|
HPM_CNT_WIDTH : natural -- total size of HPM counters (0..64)
|
HPM_CNT_WIDTH : natural -- total size of HPM counters (0..64)
|
);
|
);
|
port (
|
port (
|
| Line 106... |
Line 106... |
i_bus_re_o : out std_ulogic; -- read enable
|
i_bus_re_o : out std_ulogic; -- read enable
|
i_bus_lock_o : out std_ulogic; -- exclusive access request
|
i_bus_lock_o : out std_ulogic; -- exclusive access request
|
i_bus_ack_i : in std_ulogic; -- bus transfer acknowledge
|
i_bus_ack_i : in std_ulogic; -- bus transfer acknowledge
|
i_bus_err_i : in std_ulogic; -- bus transfer error
|
i_bus_err_i : in std_ulogic; -- bus transfer error
|
i_bus_fence_o : out std_ulogic; -- executed FENCEI operation
|
i_bus_fence_o : out std_ulogic; -- executed FENCEI operation
|
i_bus_priv_o : out std_ulogic_vector(1 downto 0); -- privilege level
|
i_bus_priv_o : out std_ulogic; -- privilege level
|
-- data bus interface --
|
-- data bus interface --
|
d_bus_addr_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus access address
|
d_bus_addr_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus access address
|
d_bus_rdata_i : in std_ulogic_vector(data_width_c-1 downto 0); -- bus read data
|
d_bus_rdata_i : in std_ulogic_vector(data_width_c-1 downto 0); -- bus read data
|
d_bus_wdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus write data
|
d_bus_wdata_o : out std_ulogic_vector(data_width_c-1 downto 0); -- bus write data
|
d_bus_ben_o : out std_ulogic_vector(03 downto 0); -- byte enable
|
d_bus_ben_o : out std_ulogic_vector(03 downto 0); -- byte enable
|
| Line 118... |
Line 118... |
d_bus_re_o : out std_ulogic; -- read enable
|
d_bus_re_o : out std_ulogic; -- read enable
|
d_bus_lock_o : out std_ulogic; -- exclusive access request
|
d_bus_lock_o : out std_ulogic; -- exclusive access request
|
d_bus_ack_i : in std_ulogic; -- bus transfer acknowledge
|
d_bus_ack_i : in std_ulogic; -- bus transfer acknowledge
|
d_bus_err_i : in std_ulogic; -- bus transfer error
|
d_bus_err_i : in std_ulogic; -- bus transfer error
|
d_bus_fence_o : out std_ulogic; -- executed FENCE operation
|
d_bus_fence_o : out std_ulogic; -- executed FENCE operation
|
d_bus_priv_o : out std_ulogic_vector(1 downto 0); -- privilege level
|
d_bus_priv_o : out std_ulogic; -- privilege level
|
-- system time input from MTIME --
|
-- system time input from MTIME --
|
time_i : in std_ulogic_vector(63 downto 0); -- current system time
|
time_i : in std_ulogic_vector(63 downto 0); -- current system time
|
-- interrupts (risc-v compliant) --
|
-- interrupts (risc-v compliant) --
|
msw_irq_i : in std_ulogic;-- machine software interrupt
|
msw_irq_i : in std_ulogic;-- machine software interrupt
|
mext_irq_i : in std_ulogic;-- machine external interrupt
|
mext_irq_i : in std_ulogic;-- machine external interrupt
|
| Line 183... |
Line 183... |
cond_sel_string_f(CPU_EXTENSION_RISCV_Zihpm, "_Zihpm", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_Zihpm, "_Zihpm", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_Zifencei, "_Zifencei", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_Zifencei, "_Zifencei", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_Zfinx, "_Zfinx", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_Zfinx, "_Zfinx", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_Zmmul, "_Zmmul", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_Zmmul, "_Zmmul", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_Zxcfu, "_Zxcfu", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_Zxcfu, "_Zxcfu", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_DEBUG, "_DEBUG", "") &
|
cond_sel_string_f(CPU_EXTENSION_RISCV_DEBUG, "_DebugMode", "") &
|
""
|
""
|
severity note;
|
severity note;
|
|
|
|
|
-- Sanity Checks --------------------------------------------------------------------------
|
-- Sanity Checks --------------------------------------------------------------------------
|
| Line 211... |
Line 211... |
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 to be enabled." severity error;
|
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 to be enabled." severity error;
|
|
|
-- Instruction prefetch buffer size --
|
-- Instruction prefetch buffer size --
|
assert not (is_power_of_two_f(CPU_IPB_ENTRIES) = false) report "NEORV32 CPU CONFIG ERROR! Number of entries in instruction prefetch buffer <CPU_IPB_ENTRIES> has to be a power of two." severity error;
|
assert not (is_power_of_two_f(CPU_IPB_ENTRIES) = false) report "NEORV32 CPU CONFIG ERROR! Number of entries in instruction prefetch buffer <CPU_IPB_ENTRIES> has to be a power of two." severity error;
|
|
|
-- PMP regions check --
|
-- PMP check --
|
assert not (PMP_NUM_REGIONS > 64) report "NEORV32 CPU CONFIG ERROR! Number of PMP regions <PMP_NUM_REGIONS> out of valid range (0..64)." severity error;
|
assert not (PMP_NUM_REGIONS > 16) report "NEORV32 CPU CONFIG ERROR! Number of PMP regions <PMP_NUM_REGIONS> out of valid range (0..16)." severity error;
|
-- PMP granularity --
|
|
assert not ((is_power_of_two_f(PMP_MIN_GRANULARITY) = false) and (PMP_NUM_REGIONS > 0)) report "NEORV32 CPU CONFIG ERROR! <PMP_MIN_GRANULARITY> has to be a power of two." severity error;
|
assert not ((is_power_of_two_f(PMP_MIN_GRANULARITY) = false) and (PMP_NUM_REGIONS > 0)) report "NEORV32 CPU CONFIG ERROR! <PMP_MIN_GRANULARITY> has to be a power of two." severity error;
|
assert not ((PMP_MIN_GRANULARITY < 8) and (PMP_NUM_REGIONS > 0)) report "NEORV32 CPU CONFIG ERROR! <PMP_MIN_GRANULARITY> has to be >= 8 bytes." severity error;
|
assert not ((PMP_MIN_GRANULARITY < 4) and (PMP_NUM_REGIONS > 0)) report "NEORV32 CPU CONFIG ERROR! <PMP_MIN_GRANULARITY> has to be >= 4 bytes." severity error;
|
assert not ((CPU_EXTENSION_RISCV_Zicsr = false) and (PMP_NUM_REGIONS > 0)) report "NEORV32 CPU CONFIG ERROR! Physical memory protection (PMP) requires <CPU_EXTENSION_RISCV_Zicsr> extension to be enabled." severity error;
|
assert not ((CPU_EXTENSION_RISCV_Zicsr = false) and (PMP_NUM_REGIONS > 0)) report "NEORV32 CPU CONFIG ERROR! Physical memory protection (PMP) requires <CPU_EXTENSION_RISCV_Zicsr> extension to be enabled." severity error;
|
|
|
-- HPM counters check --
|
-- HPM counters check --
|
assert not ((CPU_EXTENSION_RISCV_Zihpm = true) and (HPM_NUM_CNTS > 29)) report "NEORV32 CPU CONFIG ERROR! Number of HPM counters <HPM_NUM_CNTS> out of valid range (0..29)." severity error;
|
assert not ((CPU_EXTENSION_RISCV_Zihpm = true) and (HPM_NUM_CNTS > 29)) report "NEORV32 CPU CONFIG ERROR! Number of HPM counters <HPM_NUM_CNTS> out of valid range (0..29)." severity error;
|
assert not ((CPU_EXTENSION_RISCV_Zihpm = true) and ((HPM_CNT_WIDTH < 0) or (HPM_CNT_WIDTH > 64))) report "NEORV32 CPU CONFIG ERROR! HPM counter width <HPM_CNT_WIDTH> has to be 0..64 bit." severity error;
|
assert not ((CPU_EXTENSION_RISCV_Zihpm = true) and ((HPM_CNT_WIDTH < 0) or (HPM_CNT_WIDTH > 64))) report "NEORV32 CPU CONFIG ERROR! HPM counter width <HPM_CNT_WIDTH> has to be 0..64 bit." severity error;
|
| Line 269... |
Line 268... |
FAST_MUL_EN => FAST_MUL_EN, -- use DSPs for M extension's multiplier
|
FAST_MUL_EN => FAST_MUL_EN, -- use DSPs for M extension's multiplier
|
FAST_SHIFT_EN => FAST_SHIFT_EN, -- use barrel shifter for shift operations
|
FAST_SHIFT_EN => FAST_SHIFT_EN, -- use barrel shifter for shift operations
|
CPU_CNT_WIDTH => CPU_CNT_WIDTH, -- total width of CPU cycle and instret counters (0..64)
|
CPU_CNT_WIDTH => CPU_CNT_WIDTH, -- total width of CPU cycle and instret counters (0..64)
|
CPU_IPB_ENTRIES => CPU_IPB_ENTRIES, -- entries is instruction prefetch buffer, has to be a power of 2
|
CPU_IPB_ENTRIES => CPU_IPB_ENTRIES, -- entries is instruction prefetch buffer, has to be a power of 2
|
-- Physical memory protection (PMP) --
|
-- Physical memory protection (PMP) --
|
PMP_NUM_REGIONS => PMP_NUM_REGIONS, -- number of regions (0..64)
|
PMP_NUM_REGIONS => PMP_NUM_REGIONS, -- number of regions (0..16)
|
PMP_MIN_GRANULARITY => PMP_MIN_GRANULARITY, -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
|
PMP_MIN_GRANULARITY => PMP_MIN_GRANULARITY, -- minimal region granularity in bytes, has to be a power of 2, min 4 bytes
|
-- Hardware Performance Monitors (HPM) --
|
-- Hardware Performance Monitors (HPM) --
|
HPM_NUM_CNTS => HPM_NUM_CNTS, -- number of implemented HPM counters (0..29)
|
HPM_NUM_CNTS => HPM_NUM_CNTS, -- number of implemented HPM counters (0..29)
|
HPM_CNT_WIDTH => HPM_CNT_WIDTH -- total size of HPM counters
|
HPM_CNT_WIDTH => HPM_CNT_WIDTH -- total size of HPM counters
|
)
|
)
|
port map (
|
port map (
|
| Line 339... |
Line 338... |
port map (
|
port map (
|
-- global control --
|
-- global control --
|
clk_i => clk_i, -- global clock, rising edge
|
clk_i => clk_i, -- global clock, rising edge
|
ctrl_i => ctrl, -- main control bus
|
ctrl_i => ctrl, -- main control bus
|
-- data input --
|
-- data input --
|
mem_i => mem_rdata, -- memory read data
|
|
alu_i => alu_res, -- ALU result
|
alu_i => alu_res, -- ALU result
|
|
mem_i => mem_rdata, -- memory read data
|
|
csr_i => csr_rdata, -- CSR read data
|
|
pc2_i => next_pc, -- next PC
|
-- data output --
|
-- data output --
|
rs1_o => rs1, -- operand 1
|
rs1_o => rs1, -- operand 1
|
rs2_o => rs2 -- operand 2
|
rs2_o => rs2 -- operand 2
|
);
|
);
|
|
|
| Line 370... |
Line 371... |
ctrl_i => ctrl, -- main control bus
|
ctrl_i => ctrl, -- main control bus
|
-- data input --
|
-- data input --
|
rs1_i => rs1, -- rf source 1
|
rs1_i => rs1, -- rf source 1
|
rs2_i => rs2, -- rf source 2
|
rs2_i => rs2, -- rf source 2
|
pc_i => curr_pc, -- current PC
|
pc_i => curr_pc, -- current PC
|
pc2_i => next_pc, -- next PC
|
|
imm_i => imm, -- immediate
|
imm_i => imm, -- immediate
|
csr_i => csr_rdata, -- CSR read data
|
|
-- data output --
|
-- data output --
|
cmp_o => comparator, -- comparator status
|
cmp_o => comparator, -- comparator status
|
res_o => alu_res, -- ALU result
|
res_o => alu_res, -- ALU result
|
add_o => alu_add, -- address computation result
|
add_o => alu_add, -- address computation result
|
fpu_flags_o => fpu_flags, -- FPU exception flags
|
fpu_flags_o => fpu_flags, -- FPU exception flags
|
| Line 390... |
Line 389... |
neorv32_cpu_bus_inst: neorv32_cpu_bus
|
neorv32_cpu_bus_inst: neorv32_cpu_bus
|
generic map (
|
generic map (
|
CPU_EXTENSION_RISCV_A => CPU_EXTENSION_RISCV_A, -- implement atomic extension?
|
CPU_EXTENSION_RISCV_A => CPU_EXTENSION_RISCV_A, -- implement atomic extension?
|
CPU_EXTENSION_RISCV_C => CPU_EXTENSION_RISCV_C, -- implement compressed extension?
|
CPU_EXTENSION_RISCV_C => CPU_EXTENSION_RISCV_C, -- implement compressed extension?
|
-- Physical memory protection (PMP) --
|
-- Physical memory protection (PMP) --
|
PMP_NUM_REGIONS => PMP_NUM_REGIONS, -- number of regions (0..64)
|
PMP_NUM_REGIONS => PMP_NUM_REGIONS, -- number of regions (0..16)
|
PMP_MIN_GRANULARITY => PMP_MIN_GRANULARITY -- minimal region granularity in bytes, has to be a power of 2, min 8 bytes
|
PMP_MIN_GRANULARITY => PMP_MIN_GRANULARITY -- minimal region granularity in bytes, has to be a power of 2, min 4 bytes
|
)
|
)
|
port map (
|
port map (
|
-- global control --
|
-- global control --
|
clk_i => clk_i, -- global clock, rising edge
|
clk_i => clk_i, -- global clock, rising edge
|
rstn_i => rstn_i, -- global reset, low-active, async
|
rstn_i => rstn_i, -- global reset, low-active, async
|
| Line 445... |
Line 444... |
d_bus_err_i => d_bus_err_i, -- bus transfer error
|
d_bus_err_i => d_bus_err_i, -- bus transfer error
|
d_bus_fence_o => d_bus_fence_o -- fence operation
|
d_bus_fence_o => d_bus_fence_o -- fence operation
|
);
|
);
|
|
|
-- current privilege level --
|
-- current privilege level --
|
i_bus_priv_o <= ctrl(ctrl_priv_lvl_msb_c downto ctrl_priv_lvl_lsb_c);
|
i_bus_priv_o <= ctrl(ctrl_priv_mode_c);
|
d_bus_priv_o <= ctrl(ctrl_priv_lvl_msb_c downto ctrl_priv_lvl_lsb_c);
|
d_bus_priv_o <= ctrl(ctrl_priv_mode_c);
|
|
|
|
|
end neorv32_cpu_rtl;
|
end neorv32_cpu_rtl;
|
|
|
No newline at end of file
|
No newline at end of file
|
