neorv32/rtl/system_integration/neorv32_SystemTop_axi4lite.vhd

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2024-02-24 08:25:27 +00:00
-- #################################################################################################
-- # << NEORV32 - Processor Top Entity with AXI4-Lite Compatible Host Interface >> #
-- # ********************************************************************************************* #
-- # (c) "AXI", "AXI4", "AXI4-Lite" and "AXI-Stream" are trademarks of ARM Holdings plc. #
-- # ********************************************************************************************* #
-- # BSD 3-Clause License #
-- # #
-- # The NEORV32 RISC-V Processor, https://github.com/stnolting/neorv32 #
-- # Copyright (c) 2024, Stephan Nolting. All rights reserved. #
-- # #
-- # Redistribution and use in source and binary forms, with or without modification, are #
-- # permitted provided that the following conditions are met: #
-- # #
-- # 1. Redistributions of source code must retain the above copyright notice, this list of #
-- # conditions and the following disclaimer. #
-- # #
-- # 2. Redistributions in binary form must reproduce the above copyright notice, this list of #
-- # conditions and the following disclaimer in the documentation and/or other materials #
-- # provided with the distribution. #
-- # #
-- # 3. Neither the name of the copyright holder nor the names of its contributors may be used to #
-- # endorse or promote products derived from this software without specific prior written #
-- # permission. #
-- # #
-- # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS #
-- # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF #
-- # MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE #
-- # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
-- # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE #
-- # GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED #
-- # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING #
-- # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED #
-- # OF THE POSSIBILITY OF SUCH DAMAGE. #
-- #################################################################################################
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library neorv32;
use neorv32.neorv32_package.all;
entity neorv32_SystemTop_axi4lite is
generic (
-- ------------------------------------------------------------
-- Configuration Generics --
-- ------------------------------------------------------------
-- General --
CLOCK_FREQUENCY : natural := 0; -- clock frequency of clk_i in Hz
HART_ID : std_ulogic_vector(31 downto 0) := x"00000000"; -- hardware thread ID
VENDOR_ID : std_ulogic_vector(31 downto 0) := x"00000000"; -- vendor's JEDEC ID
INT_BOOTLOADER_EN : boolean := true; -- boot configuration: true = boot explicit bootloader; false = boot from int/ext (I)MEM
-- On-Chip Debugger (OCD) --
ON_CHIP_DEBUGGER_EN : boolean := false; -- implement on-chip debugger
DM_LEGACY_MODE : boolean := false; -- debug module spec version: false = v1.0, true = v0.13
-- RISC-V CPU Extensions --
CPU_EXTENSION_RISCV_A : boolean := false; -- implement atomic memory operations extension?
CPU_EXTENSION_RISCV_B : boolean := false; -- implement bit-manipulation extension?
CPU_EXTENSION_RISCV_C : boolean := false; -- implement compressed extension?
CPU_EXTENSION_RISCV_E : boolean := false; -- implement embedded RF extension?
CPU_EXTENSION_RISCV_M : boolean := false; -- implement muld/div extension?
CPU_EXTENSION_RISCV_U : boolean := false; -- implement user mode extension?
CPU_EXTENSION_RISCV_Zfinx : boolean := false; -- implement 32-bit floating-point extension (using INT reg!)
CPU_EXTENSION_RISCV_Zicntr : boolean := true; -- implement base counters?
CPU_EXTENSION_RISCV_Zihpm : boolean := false; -- implement hardware performance monitors?
CPU_EXTENSION_RISCV_Zmmul : boolean := false; -- implement multiply-only M sub-extension?
CPU_EXTENSION_RISCV_Zxcfu : boolean := false; -- implement custom (instr.) functions unit?
-- Extension Options --
FAST_MUL_EN : boolean := false; -- use DSPs for M extension's multiplier
FAST_SHIFT_EN : boolean := false; -- use barrel shifter for shift operations
-- Physical Memory Protection (PMP) --
PMP_NUM_REGIONS : natural := 0; -- number of regions (0..16)
PMP_MIN_GRANULARITY : natural := 4; -- minimal region granularity in bytes, has to be a power of 2, min 4 bytes
-- Hardware Performance Monitors (HPM) --
HPM_NUM_CNTS : natural := 0; -- number of implemented HPM counters (0..29)
HPM_CNT_WIDTH : natural := 40; -- total size of HPM counters (0..64)
-- Atomic Memory Access - Reservation Set Granularity --
AMO_RVS_GRANULARITY : natural := 4; -- size in bytes, has to be a power of 2, min 4
-- Internal Instruction memory --
MEM_INT_IMEM_EN : boolean := true; -- implement processor-internal instruction memory
MEM_INT_IMEM_SIZE : natural := 16*1024; -- size of processor-internal instruction memory in bytes
-- Internal Data memory --
MEM_INT_DMEM_EN : boolean := true; -- implement processor-internal data memory
MEM_INT_DMEM_SIZE : natural := 8*1024; -- size of processor-internal data memory in bytes
-- Internal Cache memory --
ICACHE_EN : boolean := false; -- implement instruction cache
ICACHE_NUM_BLOCKS : natural := 4; -- i-cache: number of blocks (min 1), has to be a power of 2
ICACHE_BLOCK_SIZE : natural := 64; -- i-cache: block size in bytes (min 4), has to be a power of 2
ICACHE_ASSOCIATIVITY : natural := 1; -- i-cache: associativity / number of sets (1=direct_mapped), has to be a power of 2
-- Internal Data Cache (dCACHE) --
DCACHE_EN : boolean := false; -- implement data cache
DCACHE_NUM_BLOCKS : natural := 4; -- d-cache: number of blocks (min 1), has to be a power of 2
DCACHE_BLOCK_SIZE : natural := 64; -- d-cache: block size in bytes (min 4), has to be a power of 2
-- Execute in-place module (XIP) --
XIP_EN : boolean := false; -- implement execute in place module (XIP)?
XIP_CACHE_EN : boolean := false; -- implement XIP cache?
XIP_CACHE_NUM_BLOCKS : natural range 1 to 256 := 8; -- number of blocks (min 1), has to be a power of 2
XIP_CACHE_BLOCK_SIZE : natural range 1 to 2**16 := 256; -- block size in bytes (min 4), has to be a power of 2
-- External Interrupts Controller (XIRQ) --
XIRQ_NUM_CH : natural := 0; -- number of external IRQ channels (0..32)
XIRQ_TRIGGER_TYPE : std_logic_vector(31 downto 0) := x"FFFFFFFF"; -- trigger type: 0=level, 1=edge
XIRQ_TRIGGER_POLARITY : std_logic_vector(31 downto 0) := x"FFFFFFFF"; -- trigger polarity: 0=low-level/falling-edge, 1=high-level/rising-edge
-- Processor peripherals --
IO_GPIO_NUM : natural := 0; -- number of GPIO input/output pairs (0..64)
IO_MTIME_EN : boolean := true; -- implement machine system timer (MTIME)?
IO_UART0_EN : boolean := true; -- implement primary universal asynchronous receiver/transmitter (UART0)?
IO_UART0_RX_FIFO : natural := 1; -- RX fifo depth, has to be a power of two, min 1
IO_UART0_TX_FIFO : natural := 1; -- TX fifo depth, has to be a power of two, min 1
IO_UART1_EN : boolean := true; -- implement secondary universal asynchronous receiver/transmitter (UART1)?
IO_UART1_RX_FIFO : natural := 1; -- RX fifo depth, has to be a power of two, min 1
IO_UART1_TX_FIFO : natural := 1; -- TX fifo depth, has to be a power of two, min 1
IO_SPI_EN : boolean := true; -- implement serial peripheral interface (SPI)?
IO_SPI_FIFO : natural := 1; -- SPI RTX fifo depth, has to be a power of two, min 1
IO_SDI_EN : boolean := false; -- implement serial data interface (SDI)?
IO_SDI_FIFO : natural := 1; -- RTX fifo depth, has to be zero or a power of two, min 1
IO_TWI_EN : boolean := true; -- implement two-wire interface (TWI)?
IO_PWM_NUM_CH : natural := 0; -- number of PWM channels to implement (0..12); 0 = disabled
IO_WDT_EN : boolean := true; -- implement watch dog timer (WDT)?
IO_TRNG_EN : boolean := true; -- implement true random number generator (TRNG)?
IO_TRNG_FIFO : natural := 1; -- TRNG fifo depth, has to be a power of two, min 1
IO_CFS_EN : boolean := false; -- implement custom functions subsystem (CFS)?
IO_CFS_CONFIG : std_logic_vector(31 downto 0) := x"00000000"; -- custom CFS configuration generic
IO_CFS_IN_SIZE : positive := 32; -- size of CFS input conduit in bits
IO_CFS_OUT_SIZE : positive := 32; -- size of CFS output conduit in bits
IO_NEOLED_EN : boolean := true; -- implement NeoPixel-compatible smart LED interface (NEOLED)?
IO_NEOLED_TX_FIFO : natural := 1; -- NEOLED TX FIFO depth, 1..32k, has to be a power of two
IO_GPTMR_EN : boolean := false; -- implement general purpose timer (GPTMR)?
IO_ONEWIRE_EN : boolean := false; -- implement 1-wire interface (ONEWIRE)?
IO_DMA_EN : boolean := false; -- implement direct memory access controller (DMA)?
IO_SLINK_EN : boolean := false; -- implement stream link interface (SLINK)?
IO_SLINK_RX_FIFO : natural := 1; -- RX fifo depth, has to be a power of two, min 1
IO_SLINK_TX_FIFO : natural := 1; -- TX fifo depth, has to be a power of two, min 1
IO_CRC_EN : boolean := false -- implement cyclic redundancy check unit (CRC)?
);
port (
-- ------------------------------------------------------------
-- AXI4-Lite-Compatible Master Interface --
-- ------------------------------------------------------------
-- Clock and Reset --
m_axi_aclk : in std_logic;
m_axi_aresetn : in std_logic;
-- Write Address Channel --
m_axi_awaddr : out std_logic_vector(31 downto 0);
m_axi_awprot : out std_logic_vector(2 downto 0);
m_axi_awvalid : out std_logic;
m_axi_awready : in std_logic;
-- Write Data Channel --
m_axi_wdata : out std_logic_vector(31 downto 0);
m_axi_wstrb : out std_logic_vector(3 downto 0);
m_axi_wvalid : out std_logic;
m_axi_wready : in std_logic;
-- Read Address Channel --
m_axi_araddr : out std_logic_vector(31 downto 0);
m_axi_arprot : out std_logic_vector(2 downto 0);
m_axi_arvalid : out std_logic;
m_axi_arready : in std_logic;
-- Read Data Channel --
m_axi_rdata : in std_logic_vector(31 downto 0);
m_axi_rresp : in std_logic_vector(1 downto 0);
m_axi_rvalid : in std_logic;
m_axi_rready : out std_logic;
-- Write Response Channel --
m_axi_bresp : in std_logic_vector(1 downto 0);
m_axi_bvalid : in std_logic;
m_axi_bready : out std_logic;
-- ------------------------------------------------------------
-- AXI4-Stream-Compatible Interface --
-- ------------------------------------------------------------
-- Source --
s0_axis_tdata : out std_logic_vector(31 downto 0);
s0_axis_tvalid : out std_logic;
s0_axis_tlast : out std_logic;
s0_axis_tready : in std_logic;
-- Sink --
s1_axis_tdata : in std_logic_vector(31 downto 0);
s1_axis_tvalid : in std_logic;
s1_axis_tlast : in std_logic;
s1_axis_tready : out std_logic;
-- ------------------------------------------------------------
-- JTAG on-chip debugger interface (available if ON_CHIP_DEBUGGER_EN = true) --
-- ------------------------------------------------------------
jtag_trst_i : in std_logic; -- low-active TAP reset (optional)
jtag_tck_i : in std_logic; -- serial clock
jtag_tdi_i : in std_logic; -- serial data input
jtag_tdo_o : out std_logic; -- serial data output
jtag_tms_i : in std_logic; -- mode select
-- ------------------------------------------------------------
-- Processor IO --
-- ------------------------------------------------------------
-- XIP (execute in place via SPI) signals (available if IO_XIP_EN = true) --
xip_csn_o : out std_logic; -- chip-select, low-active
xip_clk_o : out std_logic; -- serial clock
xip_dat_i : in std_logic; -- device data input
xip_dat_o : out std_logic; -- controller data output
-- GPIO (available if IO_GPIO_EN = true) --
gpio_o : out std_logic_vector(63 downto 0); -- parallel output
gpio_i : in std_logic_vector(63 downto 0); -- parallel input
-- primary UART0 (available if IO_UART0_EN = true) --
uart0_txd_o : out std_logic; -- UART0 send data
uart0_rxd_i : in std_logic; -- UART0 receive data
uart0_rts_o : out std_logic; -- HW flow control: UART0.RX ready to receive ("RTR"), low-active, optional
uart0_cts_i : in std_logic; -- HW flow control: UART0.TX allowed to transmit, low-active, optional
-- secondary UART1 (available if IO_UART1_EN = true) --
uart1_txd_o : out std_logic; -- UART1 send data
uart1_rxd_i : in std_logic; -- UART1 receive data
uart1_rts_o : out std_logic; -- HW flow control: UART1.RX ready to receive ("RTR"), low-active, optional
uart1_cts_i : in std_logic; -- HW flow control: UART1.TX allowed to transmit, low-active, optional
-- SPI (available if IO_SPI_EN = true) --
spi_clk_o : out std_logic; -- SPI serial clock
spi_dat_o : out std_logic; -- controller data out, peripheral data in
spi_dat_i : in std_logic; -- controller data in, peripheral data out
spi_csn_o : out std_logic_vector(07 downto 0); -- SPI CS
-- SDI (available if IO_SDI_EN = true) --
sdi_clk_i : in std_logic; -- SDI serial clock
sdi_dat_o : out std_logic; -- controller data out, peripheral data in
sdi_dat_i : in std_logic; -- controller data in, peripheral data out
sdi_csn_i : in std_logic; -- chip-select
-- TWI (available if IO_TWI_EN = true) --
twi_sda_i : in std_logic; -- serial data line sense input
twi_sda_o : out std_logic; -- serial data line output (pull low only)
twi_scl_i : in std_logic; -- serial clock line sense input
twi_scl_o : out std_logic; -- serial clock line output (pull low only)
-- 1-Wire Interface (available if IO_ONEWIRE_EN = true) --
onewire_i : in std_logic; -- 1-wire bus sense input
onewire_o : out std_logic; -- 1-wire bus output (pull low only)
-- PWM (available if IO_PWM_NUM_CH > 0) --
pwm_o : out std_logic_vector(11 downto 0); -- pwm channels
-- Custom Functions Subsystem IO (available if IO_CFS_EN = true) --
cfs_in_i : in std_logic_vector(IO_CFS_IN_SIZE-1 downto 0); -- custom inputs
cfs_out_o : out std_logic_vector(IO_CFS_OUT_SIZE-1 downto 0); -- custom outputs
-- NeoPixel-compatible smart LED interface (available if IO_NEOLED_EN = true) --
neoled_o : out std_logic; -- async serial data line
-- External platform interrupts (available if XIRQ_NUM_CH > 0) --
xirq_i : in std_logic_vector(31 downto 0); -- IRQ channels
-- CPU Interrupts --
mtime_irq_i : in std_logic; -- machine timer interrupt, available if IO_MTIME_EN = false
msw_irq_i : in std_logic; -- machine software interrupt
mext_irq_i : in std_logic -- machine external interrupt
);
end entity;
architecture neorv32_SystemTop_axi4lite_rtl of neorv32_SystemTop_axi4lite is
-- type conversion --
constant IO_CFS_CONFIG_INT : std_ulogic_vector(31 downto 0) := std_ulogic_vector(IO_CFS_CONFIG);
constant XIRQ_TRIGGER_TYPE_INT : std_ulogic_vector(31 downto 0) := std_ulogic_vector(XIRQ_TRIGGER_TYPE);
constant XIRQ_TRIGGER_POLARITY_INT : std_ulogic_vector(31 downto 0) := std_ulogic_vector(XIRQ_TRIGGER_POLARITY);
--
signal clk_i_int : std_ulogic;
signal rstn_i_int : std_ulogic;
--
signal s0_axis_tdata_int : std_ulogic_vector(31 downto 0);
signal s0_axis_tvalid_int : std_ulogic;
signal s0_axis_tlast_int : std_ulogic;
signal s0_axis_tready_int : std_ulogic;
signal s1_axis_tdata_int : std_ulogic_vector(31 downto 0);
signal s1_axis_tvalid_int : std_ulogic;
signal s1_axis_tlast_int : std_ulogic;
signal s1_axis_tready_int : std_ulogic;
--
signal jtag_trst_i_int : std_ulogic;
signal jtag_tck_i_int : std_ulogic;
signal jtag_tdi_i_int : std_ulogic;
signal jtag_tdo_o_int : std_ulogic;
signal jtag_tms_i_int : std_ulogic;
--
signal xip_csn_o_int : std_ulogic;
signal xip_clk_o_int : std_ulogic;
signal xip_dat_i_int : std_ulogic;
signal xip_dat_o_int : std_ulogic;
--
signal gpio_o_int : std_ulogic_vector(63 downto 0);
signal gpio_i_int : std_ulogic_vector(63 downto 0);
--
signal uart0_txd_o_int : std_ulogic;
signal uart0_rxd_i_int : std_ulogic;
signal uart0_rts_o_int : std_ulogic;
signal uart0_cts_i_int : std_ulogic;
--
signal uart1_txd_o_int : std_ulogic;
signal uart1_rxd_i_int : std_ulogic;
signal uart1_rts_o_int : std_ulogic;
signal uart1_cts_i_int : std_ulogic;
--
signal spi_clk_o_int : std_ulogic;
signal spi_dat_o_int : std_ulogic;
signal spi_dat_i_int : std_ulogic;
signal spi_csn_o_int : std_ulogic_vector(07 downto 0);
--
signal pwm_o_int : std_ulogic_vector(11 downto 0);
--
signal cfs_in_i_int : std_ulogic_vector(IO_CFS_IN_SIZE-1 downto 0);
signal cfs_out_o_int : std_ulogic_vector(IO_CFS_OUT_SIZE-1 downto 0);
--
signal neoled_o_int : std_ulogic;
--
signal twi_sda_i_int : std_ulogic;
signal twi_sda_o_int : std_ulogic;
signal twi_scl_i_int : std_ulogic;
signal twi_scl_o_int : std_ulogic;
--
signal onewire_i_int : std_ulogic;
signal onewire_o_int : std_ulogic;
--
signal xirq_i_int : std_ulogic_vector(31 downto 0);
--
signal mtime_irq_i_int : std_ulogic;
signal msw_irq_i_int : std_ulogic;
signal mext_irq_i_int : std_ulogic;
-- internal wishbone bus --
type wb_bus_t is record
adr : std_ulogic_vector(31 downto 0); -- address
di : std_ulogic_vector(31 downto 0); -- processor input data
do : std_ulogic_vector(31 downto 0); -- processor output data
we : std_ulogic; -- write enable
sel : std_ulogic_vector(03 downto 0); -- byte enable
stb : std_ulogic; -- strobe
cyc : std_ulogic; -- valid cycle
ack : std_ulogic; -- transfer acknowledge
err : std_ulogic; -- transfer error
tag : std_ulogic_vector(02 downto 0); -- tag
end record;
signal wb_core : wb_bus_t;
-- AXI bridge control --
type ctrl_t is record
radr_received : std_ulogic;
wadr_received : std_ulogic;
wdat_received : std_ulogic;
end record;
signal ctrl : ctrl_t;
signal ack_read, ack_write : std_ulogic; -- normal transfer termination
signal err_read, err_write : std_ulogic; -- error transfer termination
begin
-- The Core Of The Problem ----------------------------------------------------------------
-- -------------------------------------------------------------------------------------------
neorv32_top_inst: neorv32_top
generic map (
-- General --
CLOCK_FREQUENCY => CLOCK_FREQUENCY, -- clock frequency of clk_i in Hz
HART_ID => HART_ID, -- hardware thread ID
VENDOR_ID => VENDOR_ID, -- vendor's JEDEC ID
INT_BOOTLOADER_EN => INT_BOOTLOADER_EN, -- boot configuration: true = boot explicit bootloader; false = boot from int/ext (I)MEM
-- On-Chip Debugger (OCD) --
ON_CHIP_DEBUGGER_EN => ON_CHIP_DEBUGGER_EN, -- implement on-chip debugger
DM_LEGACY_MODE => DM_LEGACY_MODE, -- debug module spec version: false = v1.0, true = v0.13
-- RISC-V CPU Extensions --
CPU_EXTENSION_RISCV_A => CPU_EXTENSION_RISCV_A, -- implement atomic memory operations extension?
CPU_EXTENSION_RISCV_B => CPU_EXTENSION_RISCV_B, -- implement bit-manipulation extension?
CPU_EXTENSION_RISCV_C => CPU_EXTENSION_RISCV_C, -- implement compressed extension?
CPU_EXTENSION_RISCV_E => CPU_EXTENSION_RISCV_E, -- implement embedded RF extension?
CPU_EXTENSION_RISCV_M => CPU_EXTENSION_RISCV_M, -- implement mul/div extension?
CPU_EXTENSION_RISCV_U => CPU_EXTENSION_RISCV_U, -- implement user mode extension?
CPU_EXTENSION_RISCV_Zfinx => CPU_EXTENSION_RISCV_Zfinx, -- implement 32-bit floating-point extension (using INT reg!)
CPU_EXTENSION_RISCV_Zicntr => CPU_EXTENSION_RISCV_Zicntr, -- implement base counters?
CPU_EXTENSION_RISCV_Zihpm => CPU_EXTENSION_RISCV_Zihpm, -- implement hardware performance monitors?
CPU_EXTENSION_RISCV_Zmmul => CPU_EXTENSION_RISCV_Zmmul, -- implement multiply-only M sub-extension?
CPU_EXTENSION_RISCV_Zxcfu => CPU_EXTENSION_RISCV_Zxcfu, -- implement custom (instr.) functions unit?
-- Extension Options --
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
-- Physical Memory Protection (PMP) --
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 4 bytes
-- Hardware Performance Monitors (HPM) --
HPM_NUM_CNTS => HPM_NUM_CNTS, -- number of implemented HPM counters (0..29)
HPM_CNT_WIDTH => HPM_CNT_WIDTH, -- total size of HPM counters (0..64)
-- Atomic Memory Access - Reservation Set Granularity --
AMO_RVS_GRANULARITY => AMO_RVS_GRANULARITY, -- size in bytes, has to be a power of 2, min 4
-- Internal Instruction memory --
MEM_INT_IMEM_EN => MEM_INT_IMEM_EN, -- implement processor-internal instruction memory
MEM_INT_IMEM_SIZE => MEM_INT_IMEM_SIZE, -- size of processor-internal instruction memory in bytes
-- Internal Data memory --
MEM_INT_DMEM_EN => MEM_INT_DMEM_EN, -- implement processor-internal data memory
MEM_INT_DMEM_SIZE => MEM_INT_DMEM_SIZE, -- size of processor-internal data memory in bytes
-- Internal Cache memory --
ICACHE_EN => ICACHE_EN, -- implement instruction cache
ICACHE_NUM_BLOCKS => ICACHE_NUM_BLOCKS, -- i-cache: number of blocks (min 1), has to be a power of 2
ICACHE_BLOCK_SIZE => ICACHE_BLOCK_SIZE, -- i-cache: block size in bytes (min 4), has to be a power of 2
ICACHE_ASSOCIATIVITY => ICACHE_ASSOCIATIVITY, -- i-cache: associativity / number of sets (1=direct_mapped), has to be a power of 2
-- Internal Data Cache (dCACHE) --
DCACHE_EN => DCACHE_EN, -- implement data cache
DCACHE_NUM_BLOCKS => DCACHE_NUM_BLOCKS, -- d-cache: number of blocks (min 1), has to be a power of 2
DCACHE_BLOCK_SIZE => DCACHE_BLOCK_SIZE, -- d-cache: block size in bytes (min 4), has to be a power of 2
-- External memory interface --
MEM_EXT_EN => true, -- implement external memory bus interface?
MEM_EXT_TIMEOUT => 0, -- cycles after a pending bus access auto-terminates (0 = disabled)
MEM_EXT_PIPE_MODE => false, -- protocol: false=classic/standard wishbone mode, true=pipelined wishbone mode
MEM_EXT_BIG_ENDIAN => false, -- byte order: true=big-endian, false=little-endian
MEM_EXT_ASYNC_RX => false, -- use register buffer for RX data when false
MEM_EXT_ASYNC_TX => false, -- use register buffer for TX data when false
-- Execute in-place module (XIP) --
XIP_EN => XIP_EN, -- implement execute in place module (XIP)?
XIP_CACHE_EN => XIP_CACHE_EN, -- implement XIP cache?
XIP_CACHE_NUM_BLOCKS => XIP_CACHE_NUM_BLOCKS, -- number of blocks (min 1), has to be a power of 2
XIP_CACHE_BLOCK_SIZE => XIP_CACHE_BLOCK_SIZE, -- block size in bytes (min 4), has to be a power of 2
-- External Interrupts Controller (XIRQ) --
XIRQ_NUM_CH => XIRQ_NUM_CH, -- number of external IRQ channels (0..32)
XIRQ_TRIGGER_TYPE => XIRQ_TRIGGER_TYPE_INT, -- trigger type: 0=level, 1=edge
XIRQ_TRIGGER_POLARITY => XIRQ_TRIGGER_POLARITY_INT, -- trigger polarity: 0=low-level/falling-edge, 1=high-level/rising-edge
-- Processor peripherals --
IO_GPIO_NUM => IO_GPIO_NUM, -- number of GPIO input/output pairs (0..64)
IO_MTIME_EN => IO_MTIME_EN, -- implement machine system timer (MTIME)?
IO_UART0_EN => IO_UART0_EN, -- implement primary universal asynchronous receiver/transmitter (UART0)?
IO_UART0_RX_FIFO => IO_UART0_RX_FIFO, -- RX fifo depth, has to be a power of two, min 1
IO_UART0_TX_FIFO => IO_UART0_TX_FIFO, -- TX fifo depth, has to be a power of two, min 1
IO_UART1_EN => IO_UART1_EN, -- implement secondary universal asynchronous receiver/transmitter (UART1)?
IO_UART1_RX_FIFO => IO_UART1_RX_FIFO, -- RX fifo depth, has to be a power of two, min 1
IO_UART1_TX_FIFO => IO_UART1_TX_FIFO, -- TX fifo depth, has to be a power of two, min 1
IO_SPI_EN => IO_SPI_EN, -- implement serial peripheral interface (SPI)?
IO_SPI_FIFO => IO_SPI_FIFO, -- SPI RTX fifo depth, has to be a power of two, min 1
IO_SDI_EN => IO_SDI_EN, -- implement serial data interface (SDI)?
IO_SDI_FIFO => IO_SDI_FIFO, -- RTX fifo depth, has to be zero or a power of two, min 1
IO_TWI_EN => IO_TWI_EN, -- implement two-wire interface (TWI)?
IO_PWM_NUM_CH => IO_PWM_NUM_CH, -- number of PWM channels to implement (0..12); 0 = disabled
IO_WDT_EN => IO_WDT_EN, -- implement watch dog timer (WDT)?
IO_TRNG_EN => IO_TRNG_EN, -- implement true random number generator (TRNG)?
IO_TRNG_FIFO => IO_TRNG_FIFO, -- TRNG fifo depth, has to be a power of two, min 1
IO_CFS_EN => IO_CFS_EN, -- implement custom functions subsystem (CFS)?
IO_CFS_CONFIG => IO_CFS_CONFIG_INT, -- custom CFS configuration generic
IO_CFS_IN_SIZE => IO_CFS_IN_SIZE, -- size of CFS input conduit in bits
IO_CFS_OUT_SIZE => IO_CFS_OUT_SIZE, -- size of CFS output conduit in bits
IO_NEOLED_EN => IO_NEOLED_EN, -- implement NeoPixel-compatible smart LED interface (NEOLED)?
IO_NEOLED_TX_FIFO => IO_NEOLED_TX_FIFO, -- NEOLED TX FIFO depth, 1..32k, has to be a power of two
IO_GPTMR_EN => IO_GPTMR_EN, -- implement general purpose timer (GPTMR)?
IO_ONEWIRE_EN => IO_ONEWIRE_EN, -- implement 1-wire interface (ONEWIRE)?
IO_DMA_EN => IO_DMA_EN, -- implement direct memory access controller (DMA)?
IO_SLINK_EN => IO_SLINK_EN, -- implement stream link interface (SLINK)?
IO_SLINK_RX_FIFO => IO_SLINK_RX_FIFO, -- RX fifo depth, has to be a power of two, min 1
IO_SLINK_TX_FIFO => IO_SLINK_TX_FIFO, -- TX fifo depth, has to be a power of two, min 1
IO_CRC_EN => IO_CRC_EN -- implement cyclic redundancy check unit (CRC)?
)
port map (
-- Global control --
clk_i => clk_i_int, -- global clock, rising edge
rstn_i => rstn_i_int, -- global reset, low-active, async
-- JTAG on-chip debugger interface (available if ON_CHIP_DEBUGGER_EN = true) --
jtag_trst_i => jtag_trst_i_int, -- low-active TAP reset (optional)
jtag_tck_i => jtag_tck_i_int, -- serial clock
jtag_tdi_i => jtag_tdi_i_int, -- serial data input
jtag_tdo_o => jtag_tdo_o_int, -- serial data output
jtag_tms_i => jtag_tms_i_int, -- mode select
-- Wishbone bus interface (available if MEM_EXT_EN = true) --
wb_tag_o => wb_core.tag, -- tag
wb_adr_o => wb_core.adr, -- address
wb_dat_i => wb_core.di, -- read data
wb_dat_o => wb_core.do, -- write data
wb_we_o => wb_core.we, -- read/write
wb_sel_o => wb_core.sel, -- byte enable
wb_stb_o => wb_core.stb, -- strobe
wb_cyc_o => wb_core.cyc, -- valid cycle
wb_ack_i => wb_core.ack, -- transfer acknowledge
wb_err_i => wb_core.err, -- transfer error
-- Stream Link Interface (available if IO_SLINK_EN = true) --
slink_rx_dat_i => s1_axis_tdata_int, -- RX input data
slink_rx_val_i => s1_axis_tvalid_int, -- RX valid input
slink_rx_lst_i => s1_axis_tlast_int, -- last element of stream
slink_rx_rdy_o => s1_axis_tready_int, -- RX ready to receive
slink_tx_dat_o => s0_axis_tdata_int, -- TX output data
slink_tx_val_o => s0_axis_tvalid_int, -- TX valid output
slink_tx_lst_o => s0_axis_tlast_int, -- last element of stream
slink_tx_rdy_i => s0_axis_tready_int, -- TX ready to send
-- XIP (execute in place via SPI) signals (available if IO_XIP_EN = true) --
xip_csn_o => xip_csn_o_int, -- chip-select, low-active
xip_clk_o => xip_clk_o_int, -- serial clock
xip_dat_i => xip_dat_i_int, -- device data input
xip_dat_o => xip_dat_o_int, -- controller data output
-- GPIO (available if IO_GPIO_NUM > 0) --
gpio_o => gpio_o_int, -- parallel output
gpio_i => gpio_i_int, -- parallel input
-- primary UART0 (available if IO_UART0_EN = true) --
uart0_txd_o => uart0_txd_o_int, -- UART0 send data
uart0_rxd_i => uart0_rxd_i_int, -- UART0 receive data
uart0_rts_o => uart0_rts_o_int, -- HW flow control: UART0.RX ready to receive ("RTR"), low-active, optional
uart0_cts_i => uart0_cts_i_int, -- HW flow control: UART0.TX allowed to transmit, low-active, optional
-- secondary UART1 (available if IO_UART1_EN = true) --
uart1_txd_o => uart1_txd_o_int, -- UART1 send data
uart1_rxd_i => uart1_rxd_i_int, -- UART1 receive data
uart1_rts_o => uart1_rts_o_int, -- HW flow control: UART1.RX ready to receive ("RTR"), low-active, optional
uart1_cts_i => uart1_cts_i_int, -- HW flow control: UART1.TX allowed to transmit, low-active, optional
-- SPI (available if IO_SPI_EN = true) --
spi_clk_o => spi_clk_o_int, -- SPI serial clock
spi_dat_o => spi_dat_o_int, -- controller data out, peripheral data in
spi_dat_i => spi_dat_i_int, -- controller data in, peripheral data out
spi_csn_o => spi_csn_o_int, -- SPI CS
-- TWI (available if IO_TWI_EN = true) --
twi_sda_i => twi_sda_i_int, -- serial data line sense input
twi_sda_o => twi_sda_o_int, -- serial data line output (pull low only)
twi_scl_i => twi_scl_i_int, -- serial clock line sense input
twi_scl_o => twi_scl_o_int, -- serial clock line output (pull low only)
-- 1-Wire Interface (available if IO_ONEWIRE_EN = true) --
onewire_i => onewire_i_int, -- 1-wire bus sense input
onewire_o => onewire_o_int, -- 1-wire bus output (pull low only)
-- PWM available if IO_PWM_NUM_CH > 0) --
pwm_o => pwm_o_int, -- pwm channels
-- Custom Functions Subsystem IO (available if IO_CFS_EN = true) --
cfs_in_i => cfs_in_i_int, -- custom inputs
cfs_out_o => cfs_out_o_int, -- custom outputs
-- NeoPixel-compatible smart LED interface (available if IO_NEOLED_EN = true) --
neoled_o => neoled_o_int, -- async serial data line
-- External platform interrupts (available if XIRQ_NUM_CH > 0) --
xirq_i => xirq_i_int, -- IRQ channels
-- CPU Interrupts --
mtime_irq_i => mtime_irq_i_int, -- machine timer interrupt, available if IO_MTIME_EN = false
msw_irq_i => msw_irq_i_int, -- machine software interrupt
mext_irq_i => mext_irq_i_int -- machine external interrupt
);
-- type conversion --
s0_axis_tdata <= std_logic_vector(s0_axis_tdata_int);
s0_axis_tvalid <= std_logic(s0_axis_tvalid_int);
s0_axis_tlast <= std_logic(s0_axis_tlast_int);
s0_axis_tready_int <= std_ulogic(s0_axis_tready);
s1_axis_tdata_int <= std_ulogic_vector(s1_axis_tdata);
s1_axis_tvalid_int <= std_ulogic(s1_axis_tvalid);
s1_axis_tlast_int <= std_ulogic(s1_axis_tlast);
s1_axis_tready <= std_logic(s1_axis_tready_int);
xip_csn_o <= std_logic(xip_csn_o_int);
xip_clk_o <= std_logic(xip_clk_o_int);
xip_dat_i_int <= std_ulogic(xip_dat_i);
xip_dat_o <= std_logic(xip_dat_o_int);
gpio_o <= std_logic_vector(gpio_o_int);
gpio_i_int <= std_ulogic_vector(gpio_i);
jtag_trst_i_int <= std_ulogic(jtag_trst_i);
jtag_tck_i_int <= std_ulogic(jtag_tck_i);
jtag_tdi_i_int <= std_ulogic(jtag_tdi_i);
jtag_tdo_o <= std_logic(jtag_tdo_o_int);
jtag_tms_i_int <= std_ulogic(jtag_tms_i);
uart0_txd_o <= std_logic(uart0_txd_o_int);
uart0_rxd_i_int <= std_ulogic(uart0_rxd_i);
uart0_rts_o <= std_logic(uart0_rts_o_int);
uart0_cts_i_int <= std_ulogic(uart0_cts_i);
uart1_txd_o <= std_logic(uart1_txd_o_int);
uart1_rxd_i_int <= std_ulogic(uart1_rxd_i);
uart1_rts_o <= std_logic(uart1_rts_o_int);
uart1_cts_i_int <= std_ulogic(uart1_cts_i);
spi_clk_o <= std_logic(spi_clk_o_int);
spi_dat_o <= std_logic(spi_dat_o_int);
spi_dat_i_int <= std_ulogic(spi_dat_i);
spi_csn_o <= std_logic_vector(spi_csn_o_int);
pwm_o <= std_logic_vector(pwm_o_int);
cfs_in_i_int <= std_ulogic_vector(cfs_in_i);
cfs_out_o <= std_logic_vector(cfs_out_o_int);
neoled_o <= std_logic(neoled_o_int);
twi_sda_i_int <= std_ulogic(twi_sda_i);
twi_sda_o <= std_logic(twi_sda_o_int);
twi_scl_i_int <= std_ulogic(twi_scl_i);
twi_scl_o <= std_logic(twi_scl_o_int);
onewire_i_int <= std_ulogic(onewire_i);
onewire_o <= std_logic(onewire_o_int);
xirq_i_int <= std_ulogic_vector(xirq_i);
mtime_irq_i_int <= std_ulogic(mtime_irq_i);
msw_irq_i_int <= std_ulogic(msw_irq_i);
mext_irq_i_int <= std_ulogic(mext_irq_i);
-- Wishbone to AXI4-Lite Bridge -----------------------------------------------------------
-- -------------------------------------------------------------------------------------------
-- access arbiter --
axi_access_arbiter: process(rstn_i_int, clk_i_int)
begin
if (rstn_i_int = '0') then
ctrl.radr_received <= '0';
ctrl.wadr_received <= '0';
ctrl.wdat_received <= '0';
elsif rising_edge(clk_i_int) then
if (wb_core.cyc = '0') then -- idle
ctrl.radr_received <= '0';
ctrl.wadr_received <= '0';
ctrl.wdat_received <= '0';
else -- busy
-- "read address received" flag --
if (wb_core.we = '0') then -- pending READ
if (m_axi_arready = '1') then -- read address received by interconnect?
ctrl.radr_received <= '1';
end if;
end if;
-- "write address received" flag --
if (wb_core.we = '1') then -- pending WRITE
if (m_axi_awready = '1') then -- write address received by interconnect?
ctrl.wadr_received <= '1';
end if;
end if;
-- "write data received" flag --
if (wb_core.we = '1') then -- pending WRITE
if (m_axi_wready = '1') then -- write data received by interconnect?
ctrl.wdat_received <= '1';
end if;
end if;
end if;
end if;
end process axi_access_arbiter;
-- AXI4-Lite Global Signals --
clk_i_int <= std_ulogic(m_axi_aclk);
rstn_i_int <= std_ulogic(m_axi_aresetn);
-- AXI4-Lite Read Address Channel --
m_axi_araddr <= std_logic_vector(wb_core.adr);
m_axi_arvalid <= std_logic((wb_core.cyc and (not wb_core.we)) and (not ctrl.radr_received));
--m_axi_arprot <= "000"; -- recommended by Xilinx
m_axi_arprot(0) <= wb_core.tag(0); -- 0:unprivileged access, 1:privileged access
m_axi_arprot(1) <= wb_core.tag(1); -- 0:secure access, 1:non-secure access
m_axi_arprot(2) <= wb_core.tag(2); -- 0:data access, 1:instruction access
-- AXI4-Lite Read Data Channel --
m_axi_rready <= std_logic(wb_core.cyc and (not wb_core.we));
wb_core.di <= std_ulogic_vector(m_axi_rdata);
ack_read <= std_ulogic(m_axi_rvalid);
err_read <= '0' when (m_axi_rresp = "00") else '1'; -- read response = ok? check this signal only when m_axi_rvalid = '1'
-- AXI4-Lite Write Address Channel --
m_axi_awaddr <= std_logic_vector(wb_core.adr);
m_axi_awvalid <= std_logic((wb_core.cyc and wb_core.we) and (not ctrl.wadr_received));
--m_axi_awprot <= "000"; -- recommended by Xilinx
m_axi_awprot(0) <= wb_core.tag(0); -- 0:unprivileged access, 1:privileged access
m_axi_awprot(1) <= wb_core.tag(1); -- 0:secure access, 1:non-secure access
m_axi_awprot(2) <= wb_core.tag(2); -- 0:data access, 1:instruction access
-- AXI4-Lite Write Data Channel --
m_axi_wdata <= std_logic_vector(wb_core.do);
m_axi_wvalid <= std_logic((wb_core.cyc and wb_core.we) and (not ctrl.wdat_received));
m_axi_wstrb <= std_logic_vector(wb_core.sel); -- byte-enable
-- AXI4-Lite Write Response Channel --
m_axi_bready <= std_logic(wb_core.cyc and wb_core.we);
ack_write <= std_ulogic(m_axi_bvalid);
err_write <= '0' when (m_axi_bresp = "00") else '1'; -- write response = ok? check this signal only when m_axi_bvalid = '1'
-- Wishbone transfer termination --
wb_core.ack <= ack_read or ack_write;
wb_core.err <= (ack_read and err_read) or (ack_write and err_write);
end architecture;