#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) 2020 David Corrigan # Copyright (c) 2020 Alan Green # SPDX-License-Identifier: BSD-2-Clause from migen import * from migen.genlib.resetsync import AsyncResetSynchronizer from litex.gen import * from litex_boards.platforms import lattice_crosslink_nx_evn from litex.soc.cores.ram import NXLRAM from litex.soc.cores.clock import NXPLL from litex.build.io import CRG from litex.build.generic_platform import * from litex.soc.cores.clock import * from litex.soc.integration.soc_core import * from litex.soc.integration.soc import SoCRegion from litex.soc.integration.builder import * from litex.soc.cores.led import LedChaser kB = 1024 mB = 1024*kB # CRG ---------------------------------------------------------------------------------------------- class _CRG(LiteXModule): def __init__(self, platform, sys_clk_freq): self.rst = Signal() self.cd_por = ClockDomain() self.cd_sys = ClockDomain() # Built in OSC self.hf_clk = NXOSCA() hf_clk_freq = 25e6 self.hf_clk.create_hf_clk(self.cd_por, hf_clk_freq) # Power on reset por_count = Signal(16, reset=2**16-1) por_done = Signal() self.comb += por_done.eq(por_count == 0) self.sync.por += If(~por_done, por_count.eq(por_count - 1)) self.rst_n = platform.request("gsrn") self.specials += AsyncResetSynchronizer(self.cd_por, ~self.rst_n) # PLL self.sys_pll = sys_pll = NXPLL(platform=platform, create_output_port_clocks=True) self.comb += sys_pll.reset.eq(self.rst) sys_pll.register_clkin(self.cd_por.clk, hf_clk_freq) sys_pll.create_clkout(self.cd_sys, sys_clk_freq) self.specials += AsyncResetSynchronizer(self.cd_sys, ~self.sys_pll.locked | ~por_done ) # BaseSoC ------------------------------------------------------------------------------------------ class BaseSoC(SoCCore): mem_map = { "rom" : 0x00000000, "sram" : 0x40000000, "main_ram" : 0x60000000, "csr" : 0xf0000000, } def __init__(self, sys_clk_freq=75e6, device="LIFCL-40-9BG400C", toolchain="radiant", with_led_chaser = True, with_spi_flash = False, with_uartbone = False, **kwargs): platform = lattice_crosslink_nx_evn.Platform(device=device, toolchain=toolchain) # CRG -------------------------------------------------------------------------------------- self.crg = _CRG(platform, sys_clk_freq) # SoCCore -----------------------------------------_---------------------------------------- # Disable Integrated SRAM since we want to instantiate LRAM specifically for it kwargs["integrated_sram_size"] = 0 # Make serial_pmods available platform.add_extension(lattice_crosslink_nx_evn.serial_pmods) SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Crosslink-NX Evaluation Board", **kwargs) # 128KB LRAM (used as SRAM) --------------------------------------------------------------- self.spram = NXLRAM(32, 64*kB) self.bus.add_slave("sram", self.spram.bus, SoCRegion(origin=self.mem_map["sram"], size=16*kB)) self.main_ram = NXLRAM(32, 64*kB) self.bus.add_slave("main_ram", self.main_ram.bus, SoCRegion(origin=self.mem_map["main_ram"], size=64*kB)) # Leds ------------------------------------------------------------------------------------- if with_led_chaser: self.leds = LedChaser( pads = Cat(*[platform.request("user_led", i) for i in range(14)]), sys_clk_freq = sys_clk_freq) # UARTBone --------------------------------------------------------------------------------- if with_uartbone: self.add_uartbone() # SPI Flash -------------------------------------------------------------------------------- if with_spi_flash: from litespi.modules import MX25L12833F from litespi.opcodes import SpiNorFlashOpCodes as Codes self.add_spi_flash(mode="4x", clk_freq=100_000, module=MX25L12833F(Codes.READ_4_4_4), with_master=True) # Build -------------------------------------------------------------------------------------------- def main(): from litex.build.parser import LiteXArgumentParser parser = LiteXArgumentParser(platform=lattice_crosslink_nx_evn.Platform, description="LiteX SoC on Crosslink-NX Eval Board.") parser.add_target_argument("--device", default="LIFCL-40-9BG400C", help="FPGA device (LIFCL-40-9BG400C, LIFCL-40-8BG400CES, or LIFCL-40-8BG400CES2).") parser.add_target_argument("--sys-clk-freq", default=75e6, type=float, help="System clock frequency.") parser.add_target_argument("--serial", default="serial", help="UART Pins (serial (requires R15 and R17 to be soldered) or serial_pmod[0-2]).") parser.add_target_argument("--programmer", default="radiant", help="Programmer (radiant or ecpprog or openocd).") parser.add_target_argument("--address", default=0x0, help="Flash address to program bitstream at.") parser.add_target_argument("--prog-target", default="direct", help="Programming Target (direct or flash).") parser.add_target_argument("--with-spi-flash", action="store_true", help="Enable SPI Flash (MMAPed).") parser.add_target_argument("--with-uartbone", action="store_true", help="Add UartBone on 1st serial.") args = parser.parse_args() soc = BaseSoC( sys_clk_freq = args.sys_clk_freq, device = args.device, toolchain = args.toolchain, with_spi_flash = args.with_spi_flash, with_uartbone = args.with_uartbone, **parser.soc_argdict ) builder = Builder(soc, **parser.builder_argdict) if args.build: builder.build(**parser.toolchain_argdict) if args.load: prog = soc.platform.create_programmer(args.prog_target, args.programmer) if args.programmer == "ecpprog" and args.prog_target == "flash": prog.flash(args.address, builder.get_bitstream_filename(mode="sram")) else: prog.load_bitstream(builder.get_bitstream_filename(mode="sram")) if __name__ == "__main__": main()