#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) 2020 Gary Wong # SPDX-License-Identifier: BSD-2-Clause import os import argparse from migen import * from migen.genlib.resetsync import AsyncResetSynchronizer from litex_boards.platforms import fpc_iii 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.builder import * from litex.soc.cores.led import LedChaser from litedram.modules import IS43TR16256A from litedram.phy import ECP5DDRPHY from liteeth.phy.mii import LiteEthPHYMII # CRG ---------------------------------------------------------------------------------------------- class _CRG(Module): def __init__(self, platform, sys_clk_freq): self.rst = Signal() 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.stop = Signal() self.reset = Signal() # Clk / Rst clk25 = platform.request("clk25") # Power on reset por_count = Signal(16, reset=2**16-1) por_done = Signal() self.comb += self.cd_por.clk.eq(clk25) 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 | self.rst) pll.register_clkin(clk25, 25e6) pll.create_clkout(self.cd_sys2x_i, 2*sys_clk_freq) pll.create_clkout(self.cd_init, 25e6) 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), ] # BaseSoC ------------------------------------------------------------------------------------------ class BaseSoC(SoCCore): def __init__(self, sys_clk_freq=int(80e6), toolchain="trellis", with_ethernet=False, with_etherbone=False, **kwargs): platform = fpc_iii.Platform(toolchain=toolchain) # Serial ----------------------------------------------------------------------------------- if kwargs[ "uart_name" ] == "serial": # Defaults to USB FIFO since no real serial. kwargs[ "uart_name" ] = "usb_fifo" # SoCCore ---------------------------------------------------------------------------------- SoCCore.__init__(self, platform, sys_clk_freq, ident = "LiteX SoC on FPC-III", ident_version = True, **kwargs) # CRG -------------------------------------------------------------------------------------- self.submodules.crg = _CRG(platform, sys_clk_freq) # DDR3 SDRAM ------------------------------------------------------------------------------- if not self.integrated_main_ram_size: ddram = platform.request("ddram") self.submodules.ddrphy = ECP5DDRPHY(ddram, sys_clk_freq, clk_polarity=1) # clk_p/n swapped. self.ddrphy.settings.rtt_nom = "disabled" self.comb += self.crg.stop.eq(self.ddrphy.init.stop) self.comb += self.crg.reset.eq(self.ddrphy.init.reset) self.comb += ddram.vccio.eq(Replicate(C(1), ddram.vccio.nbits)) self.add_sdram("sdram", phy = self.ddrphy, module = IS43TR16256A(sys_clk_freq, "1:2"), l2_cache_size = kwargs.get("l2_size", 8192) ) self.comb += platform.request("dram_vtt_en").eq(0 if self.integrated_main_ram_size else 1) # Ethernet --------------------------------------------------------------------------------- if with_ethernet or with_etherbone: self.submodules.ethphy = LiteEthPHYMII( clock_pads = self.platform.request("eth_clocks"), pads = self.platform.request("eth")) if with_ethernet: self.add_ethernet(phy=self.ethphy) if with_etherbone: self.add_etherbone(phy=self.ethphy) # Leds ------------------------------------------------------------------------------------- self.submodules.leds = LedChaser( pads = platform.request_all("user_led"), sys_clk_freq = sys_clk_freq) # Build -------------------------------------------------------------------------------------------- def main(): parser = argparse.ArgumentParser(description="LiteX SoC on FPC-III") 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="Gateware toolchain to use, trellis (default) or diamond") parser.add_argument("--sys-clk-freq", default=80e6, help="System clock frequency (default=80MHz)") ethopts = parser.add_mutually_exclusive_group() ethopts.add_argument("--with-ethernet", action="store_true", help="Enable Ethernet support") ethopts.add_argument("--with-etherbone", action="store_true", help="Enable Ethernet wishbone support") sdopts = parser.add_mutually_exclusive_group() sdopts.add_argument("--with-spi-sdcard", action="store_true", help="Enable SPI-mode SDCard support") sdopts.add_argument("--with-sdcard", action="store_true", help="Enable SDCard support") builder_args(parser) soc_core_args(parser) trellis_args(parser) args = parser.parse_args() soc = BaseSoC( sys_clk_freq = int(float(args.sys_clk_freq)), with_ethernet = args.with_ethernet, with_etherbone = args.with_etherbone, **soc_core_argdict(args)) if args.with_spi_sdcard: soc.add_spi_sdcard() if args.with_sdcard: soc.add_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 + ".svf")) if __name__ == "__main__": main()