| Line 63... |
Line 63... |
-- Extension Options --
|
-- Extension Options --
|
FAST_MUL_EN : boolean := false; -- use DSPs for M extension's multiplier
|
FAST_MUL_EN : boolean := false; -- use DSPs for M extension's multiplier
|
FAST_SHIFT_EN : boolean := false; -- use barrel shifter for shift operations
|
FAST_SHIFT_EN : boolean := false; -- use barrel shifter for shift operations
|
-- Physical Memory Protection (PMP) --
|
-- Physical Memory Protection (PMP) --
|
PMP_USE : boolean := false; -- implement PMP?
|
PMP_USE : boolean := false; -- implement PMP?
|
PMP_NUM_REGIONS : natural := 4; -- number of regions (max 8)
|
|
PMP_GRANULARITY : natural := 14; -- minimal region granularity (1=8B, 2=16B, 3=32B, ...) default is 64k
|
|
-- Internal Instruction memory --
|
-- Internal Instruction memory --
|
MEM_INT_IMEM_USE : boolean := true; -- implement processor-internal instruction memory
|
MEM_INT_IMEM_USE : boolean := true; -- implement processor-internal instruction memory
|
MEM_INT_IMEM_SIZE : natural := 16*1024; -- size of processor-internal instruction memory in bytes
|
MEM_INT_IMEM_SIZE : natural := 16*1024; -- size of processor-internal instruction memory in bytes
|
MEM_INT_IMEM_ROM : boolean := false; -- implement processor-internal instruction memory as ROM
|
MEM_INT_IMEM_ROM : boolean := false; -- implement processor-internal instruction memory as ROM
|
-- Internal Data memory --
|
-- Internal Data memory --
|
| Line 121... |
Line 119... |
-- TWI (available if IO_TWI_USE = true) --
|
-- TWI (available if IO_TWI_USE = true) --
|
twi_sda_io : inout std_logic; -- twi serial data line
|
twi_sda_io : inout std_logic; -- twi serial data line
|
twi_scl_io : inout std_logic; -- twi serial clock line
|
twi_scl_io : inout std_logic; -- twi serial clock line
|
-- PWM (available if IO_PWM_USE = true) --
|
-- PWM (available if IO_PWM_USE = true) --
|
pwm_o : out std_ulogic_vector(03 downto 0); -- pwm channels
|
pwm_o : out std_ulogic_vector(03 downto 0); -- pwm channels
|
|
-- system time input from external MTIME (available if IO_MTIME_USE = false) --
|
|
mtime_i : in std_ulogic_vector(63 downto 0) := (others => '0'); -- current system time
|
-- Interrupts --
|
-- Interrupts --
|
mtime_irq_i : in std_ulogic := '0'; -- machine timer interrupt, available if IO_MTIME_USE = false
|
mtime_irq_i : in std_ulogic := '0'; -- machine timer interrupt, available if IO_MTIME_USE = false
|
msw_irq_i : in std_ulogic := '0'; -- machine software interrupt
|
msw_irq_i : in std_ulogic := '0'; -- machine software interrupt
|
mext_irq_i : in std_ulogic := '0' -- machine external interrupt
|
mext_irq_i : in std_ulogic := '0' -- machine external interrupt
|
);
|
);
|
| Line 171... |
Line 171... |
cancel : std_ulogic; -- cancel current transfer
|
cancel : std_ulogic; -- cancel current transfer
|
ack : std_ulogic; -- bus transfer acknowledge
|
ack : std_ulogic; -- bus transfer acknowledge
|
err : std_ulogic; -- bus transfer error
|
err : std_ulogic; -- bus transfer error
|
fence : std_ulogic; -- fence(i) instruction executed
|
fence : std_ulogic; -- fence(i) instruction executed
|
priv : std_ulogic_vector(1 downto 0); -- current privilege level
|
priv : std_ulogic_vector(1 downto 0); -- current privilege level
|
src : std_ulogic; -- access source
|
src : std_ulogic; -- access source (1=instruction fetch, 0=data access)
|
lock : std_ulogic; -- locked/exclusive (=atomic) access
|
lock : std_ulogic; -- locked/exclusive (=atomic) access
|
end record;
|
end record;
|
signal cpu_i, cpu_d, p_bus : bus_interface_t;
|
signal cpu_i, cpu_d, p_bus : bus_interface_t;
|
|
|
-- io space access --
|
-- io space access --
|
| Line 328... |
Line 328... |
CPU_EXTENSION_RISCV_Zifencei => CPU_EXTENSION_RISCV_Zifencei, -- implement instruction stream sync.?
|
CPU_EXTENSION_RISCV_Zifencei => CPU_EXTENSION_RISCV_Zifencei, -- implement instruction stream sync.?
|
-- Extension Options --
|
-- Extension Options --
|
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
|
-- Physical Memory Protection (PMP) --
|
-- Physical Memory Protection (PMP) --
|
PMP_USE => PMP_USE, -- implement PMP?
|
PMP_USE => PMP_USE -- implement PMP?
|
PMP_NUM_REGIONS => PMP_NUM_REGIONS, -- number of regions (max 8)
|
|
PMP_GRANULARITY => PMP_GRANULARITY -- minimal region granularity (1=8B, 2=16B, 3=32B, ...) default is 64k
|
|
)
|
)
|
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 => sys_rstn, -- global reset, low-active, async
|
rstn_i => sys_rstn, -- global reset, low-active, async
|
| Line 373... |
Line 371... |
-- fast interrupts (custom) --
|
-- fast interrupts (custom) --
|
firq_i => fast_irq
|
firq_i => fast_irq
|
);
|
);
|
|
|
-- misc --
|
-- misc --
|
cpu_i.src <= '1';
|
cpu_i.src <= '1'; -- initialized but unused
|
cpu_d.src <= '0';
|
cpu_d.src <= '0'; -- initialized but unused
|
|
|
-- advanced memory control --
|
-- advanced memory control --
|
fence_o <= cpu_d.fence; -- indicates an executed FENCE operation
|
fence_o <= cpu_d.fence; -- indicates an executed FENCE operation
|
fencei_o <= cpu_i.fence; -- indicates an executed FENCEI operation
|
fencei_o <= cpu_i.fence; -- indicates an executed FENCEI operation
|
|
|
| Line 598... |
Line 596... |
|
|
|
|
-- IO Access? -----------------------------------------------------------------------------
|
-- IO Access? -----------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
io_acc <= '1' when (p_bus.addr(data_width_c-1 downto index_size_f(io_size_c)) = io_base_c(data_width_c-1 downto index_size_f(io_size_c))) else '0';
|
io_acc <= '1' when (p_bus.addr(data_width_c-1 downto index_size_f(io_size_c)) = io_base_c(data_width_c-1 downto index_size_f(io_size_c))) else '0';
|
io_rden <= io_acc and p_bus.re;
|
io_rden <= io_acc and p_bus.re and (not p_bus.src); -- PMA: no_execute for IO region
|
-- the peripheral/IO devices in the IO area can only be written in word mode (reduces HW complexity)
|
-- the peripheral/IO devices in the IO area can only be written in word mode (reduces HW complexity)
|
io_wren <= io_acc and p_bus.we and p_bus.ben(3) and p_bus.ben(2) and p_bus.ben(1) and p_bus.ben(0);
|
io_wren <= io_acc and p_bus.we and and_all_f(p_bus.ben) and (not p_bus.src); -- PMA: no_execute for IO region
|
|
|
|
|
-- General Purpose Input/Output Port (GPIO) -----------------------------------------------
|
-- General Purpose Input/Output Port (GPIO) -----------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
-- -------------------------------------------------------------------------------------------
|
neorv32_gpio_inst_true:
|
neorv32_gpio_inst_true:
|
| Line 693... |
Line 691... |
end generate;
|
end generate;
|
|
|
neorv32_mtime_inst_false:
|
neorv32_mtime_inst_false:
|
if (IO_MTIME_USE = false) generate
|
if (IO_MTIME_USE = false) generate
|
mtime_rdata <= (others => '0');
|
mtime_rdata <= (others => '0');
|
mtime_time <= (others => '0');
|
mtime_time <= mtime_i; -- use external machine timer time signal
|
mtime_ack <= '0';
|
mtime_ack <= '0';
|
mtime_irq <= mtime_irq_i; -- use external machine timer interrupt
|
mtime_irq <= mtime_irq_i; -- use external machine timer interrupt
|
end generate;
|
end generate;
|
|
|
|
|
