#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) Greg Davill # SPDX-License-Identifier: BSD-2-Clause import os import sys import argparse from migen import * from migen.genlib.misc import WaitTimer from migen.genlib.resetsync import AsyncResetSynchronizer from litex_boards.platforms import orangecrab from litex.build.lattice.trellis import trellis_args, trellis_argdict from litex.soc.cores.clock import * from litex.soc.integration.soc_core import * from litex.soc.integration.soc_sdram import * from litex.soc.integration.builder import * from litex.soc.cores.led import LedChaser from litedram.modules import MT41K64M16, MT41K128M16, MT41K256M16, MT41K512M16 from litedram.phy import ECP5DDRPHY # CRG --------------------------------------------------------------------------------------------- class _CRG(Module): def __init__(self, platform, sys_clk_freq, with_usb_pll=False): self.rst = Signal() self.clock_domains.cd_por = ClockDomain(reset_less=True) self.clock_domains.cd_sys = ClockDomain() # # # # Clk / Rst clk48 = platform.request("clk48") rst_n = platform.request("usr_btn") # Power on reset por_count = Signal(16, reset=2**16-1) por_done = Signal() self.comb += self.cd_por.clk.eq(clk48) self.comb += por_done.eq(por_count == 0) self.sync.por += If(~por_done, por_count.eq(por_count - 1)) # PLL self.submodules.pll = pll = ECP5PLL() self.comb += pll.reset.eq(~por_done | ~rst_n | self.rst) pll.register_clkin(clk48, 48e6) pll.create_clkout(self.cd_sys, sys_clk_freq) # USB PLL if with_usb_pll: self.clock_domains.cd_usb_12 = ClockDomain() self.clock_domains.cd_usb_48 = ClockDomain() usb_pll = ECP5PLL() self.submodules += usb_pll self.comb += usb_pll.reset.eq(~por_done) usb_pll.register_clkin(clk48, 48e6) usb_pll.create_clkout(self.cd_usb_48, 48e6) usb_pll.create_clkout(self.cd_usb_12, 12e6) # FPGA Reset (press usr_btn for 1 second to fallback to bootloader) reset_timer = WaitTimer(int(48e6)) reset_timer = ClockDomainsRenamer("por")(reset_timer) self.submodules += reset_timer self.comb += reset_timer.wait.eq(~rst_n) self.comb += platform.request("rst_n").eq(~reset_timer.done) class _CRGSDRAM(Module): def __init__(self, platform, sys_clk_freq, with_usb_pll=False): self.clock_domains.cd_init = ClockDomain() self.clock_domains.cd_por = ClockDomain(reset_less=True) self.clock_domains.cd_sys = ClockDomain() self.clock_domains.cd_sys2x = ClockDomain() self.clock_domains.cd_sys2x_i = ClockDomain(reset_less=True) self.clock_domains.cd_sys2x_eb = ClockDomain(reset_less=True) # # # self.stop = Signal() self.reset = Signal() # Clk / Rst clk48 = platform.request("clk48") rst_n = platform.request("usr_btn") # Power on reset por_count = Signal(16, reset=2**16-1) por_done = Signal() self.comb += self.cd_por.clk.eq(clk48) self.comb += por_done.eq(por_count == 0) self.sync.por += If(~por_done, por_count.eq(por_count - 1)) # PLL sys2x_clk_ecsout = Signal() self.submodules.pll = pll = ECP5PLL() self.comb += pll.reset.eq(~por_done | ~rst_n) pll.register_clkin(clk48, 48e6) pll.create_clkout(self.cd_sys2x_i, 2*sys_clk_freq) pll.create_clkout(self.cd_init, 24e6) self.specials += [ Instance("ECLKBRIDGECS", i_CLK0 = self.cd_sys2x_i.clk, i_SEL = 0, o_ECSOUT = sys2x_clk_ecsout), Instance("ECLKSYNCB", i_ECLKI = sys2x_clk_ecsout, i_STOP = self.stop, o_ECLKO = self.cd_sys2x.clk), Instance("CLKDIVF", p_DIV = "2.0", i_ALIGNWD = 0, i_CLKI = self.cd_sys2x.clk, i_RST = self.reset, o_CDIVX = self.cd_sys.clk), AsyncResetSynchronizer(self.cd_sys, ~pll.locked | self.reset), AsyncResetSynchronizer(self.cd_sys2x, ~pll.locked | self.reset), ] # USB PLL if with_usb_pll: self.clock_domains.cd_usb_12 = ClockDomain() self.clock_domains.cd_usb_48 = ClockDomain() usb_pll = ECP5PLL() self.submodules += usb_pll self.comb += usb_pll.reset.eq(~por_done) usb_pll.register_clkin(clk48, 48e6) usb_pll.create_clkout(self.cd_usb_48, 48e6) usb_pll.create_clkout(self.cd_usb_12, 12e6) # FPGA Reset (press usr_btn for 1 second to fallback to bootloader) reset_timer = WaitTimer(int(48e6)) reset_timer = ClockDomainsRenamer("por")(reset_timer) self.submodules += reset_timer self.comb += reset_timer.wait.eq(~rst_n) self.comb += platform.request("rst_n").eq(~reset_timer.done) # BaseSoC ------------------------------------------------------------------------------------------ class BaseSoC(SoCCore): def __init__(self, revision="0.2", device="25F", sdram_device="MT41K64M16", sys_clk_freq=int(48e6), toolchain="trellis", **kwargs): platform = orangecrab.Platform(revision=revision, device=device ,toolchain=toolchain) # Serial ----------------------------------------------------------------------------------- if kwargs["uart_name"] in ["serial", "usb_acm"]: kwargs["uart_name"] = "usb_acm" # Defaults to USB ACM through ValentyUSB. os.system("git clone https://github.com/litex-hub/valentyusb -b hw_cdc_eptri") sys.path.append("valentyusb") # SoCCore ---------------------------------------------------------------------------------- SoCCore.__init__(self, platform, sys_clk_freq, ident = "LiteX SoC on OrangeCrab", ident_version = True, **kwargs) # CRG -------------------------------------------------------------------------------------- with_usb_pll = kwargs.get("uart_name", None) == "usb_acm" crg_cls = _CRGSDRAM if not self.integrated_main_ram_size else _CRG self.submodules.crg = crg_cls(platform, sys_clk_freq, with_usb_pll) # DDR3 SDRAM ------------------------------------------------------------------------------- if not self.integrated_main_ram_size: available_sdram_modules = { "MT41K64M16": MT41K64M16, "MT41K128M16": MT41K128M16, "MT41K256M16": MT41K256M16, "MT41K512M16": MT41K512M16, } sdram_module = available_sdram_modules.get(sdram_device) ddram_pads = platform.request("ddram") self.submodules.ddrphy = ECP5DDRPHY( pads = ddram_pads, sys_clk_freq = sys_clk_freq, dm_remapping = {0:1, 1:0}) self.ddrphy.settings.rtt_nom = "disabled" self.add_csr("ddrphy") if hasattr(ddram_pads, "vccio"): self.comb += ddram_pads.vccio.eq(0b111111) if hasattr(ddram_pads, "gnd"): self.comb += ddram_pads.gnd.eq(0) self.comb += self.crg.stop.eq(self.ddrphy.init.stop) self.comb += self.crg.reset.eq(self.ddrphy.init.reset) self.add_sdram("sdram", phy = self.ddrphy, module = sdram_module(sys_clk_freq, "1:2"), origin = self.mem_map["main_ram"], size = kwargs.get("max_sdram_size", 0x40000000), l2_cache_size = kwargs.get("l2_size", 8192), l2_cache_min_data_width = kwargs.get("min_l2_data_width", 128), l2_cache_reverse = True ) # Leds ------------------------------------------------------------------------------------- self.submodules.leds = LedChaser( pads = platform.request_all("user_led"), sys_clk_freq = sys_clk_freq) self.add_csr("leds") # Build -------------------------------------------------------------------------------------------- def main(): parser = argparse.ArgumentParser(description="LiteX SoC on OrangeCrab") parser.add_argument("--build", action="store_true", help="Build bitstream") parser.add_argument("--load", action="store_true", help="Load bitstream") parser.add_argument("--toolchain", default="trellis", help="FPGA use, trellis (default) or diamond") parser.add_argument("--sys-clk-freq", default=48e6, help="System clock frequency (default: 48MHz)") parser.add_argument("--revision", default="0.2", help="Board Revision: 0.1 or 0.2 (default)") parser.add_argument("--device", default="25F", help="ECP5 device (default: 25F)") parser.add_argument("--sdram-device", default="MT41K64M16", help="SDRAM device (default: MT41K64M16)") parser.add_argument("--with-spi-sdcard", action="store_true", help="Enable SPI-mode SDCard support") builder_args(parser) soc_sdram_args(parser) trellis_args(parser) args = parser.parse_args() soc = BaseSoC( toolchain = args.toolchain, revision = args.revision, device = args.device, sdram_device = args.sdram_device, sys_clk_freq = int(float(args.sys_clk_freq)), **soc_sdram_argdict(args)) if args.with_spi_sdcard: soc.add_spi_sdcard() builder = Builder(soc, **builder_argdict(args)) builder_kargs = trellis_argdict(args) if args.toolchain == "trellis" else {} builder.build(**builder_kargs, run=args.build) if args.load: prog = soc.platform.create_programmer() prog.load_bitstream(os.path.join(builder.gateware_dir, soc.build_name + ".bit")) if __name__ == "__main__": main()