167 lines
7.2 KiB
Python
Executable File
167 lines
7.2 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# This file is part of LiteX-Boards.
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#
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# Copyright (c) 2018-2019 Florent Kermarrec <florent@enjoy-digital.fr>
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# Copyright (c) 2018-2019 David Shah <dave@ds0.me>
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# SPDX-License-Identifier: BSD-2-Clause
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from migen import *
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from migen.genlib.resetsync import AsyncResetSynchronizer
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from litex_boards.platforms import versa_ecp5
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from litex.build.lattice.trellis import trellis_args, trellis_argdict
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from litex.soc.cores.clock import *
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from litex.soc.integration.soc_core import *
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from litex.soc.integration.builder import *
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from litex.soc.cores.led import LedChaser
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from litedram.modules import MT41K64M16
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from litedram.phy import ECP5DDRPHY
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from liteeth.phy.ecp5rgmii import LiteEthPHYRGMII
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# CRG ----------------------------------------------------------------------------------------------
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class _CRG(Module):
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def __init__(self, platform, sys_clk_freq):
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self.rst = Signal()
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self.clock_domains.cd_init = ClockDomain()
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self.clock_domains.cd_por = ClockDomain(reset_less=True)
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self.clock_domains.cd_sys = ClockDomain()
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self.clock_domains.cd_sys2x = ClockDomain()
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self.clock_domains.cd_sys2x_i = ClockDomain(reset_less=True)
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# # #
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self.stop = Signal()
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self.reset = Signal()
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# Clk / Rst
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clk100 = platform.request("clk100")
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rst_n = platform.request("rst_n")
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# Power on reset
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por_count = Signal(16, reset=2**16-1)
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por_done = Signal()
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self.comb += self.cd_por.clk.eq(clk100)
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self.comb += por_done.eq(por_count == 0)
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self.sync.por += If(~por_done, por_count.eq(por_count - 1))
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# PLL
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self.submodules.pll = pll = ECP5PLL()
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self.comb += pll.reset.eq(~por_done | ~rst_n | self.rst)
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pll.register_clkin(clk100, 100e6)
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pll.create_clkout(self.cd_sys2x_i, 2*sys_clk_freq)
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pll.create_clkout(self.cd_init, 25e6)
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self.specials += [
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Instance("ECLKSYNCB",
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i_ECLKI = self.cd_sys2x_i.clk,
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i_STOP = self.stop,
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o_ECLKO = self.cd_sys2x.clk),
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Instance("CLKDIVF",
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p_DIV = "2.0",
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i_ALIGNWD = 0,
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i_CLKI = self.cd_sys2x.clk,
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i_RST = self.reset,
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o_CDIVX = self.cd_sys.clk),
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AsyncResetSynchronizer(self.cd_sys, ~pll.locked | self.reset),
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AsyncResetSynchronizer(self.cd_sys2x, ~pll.locked | self.reset),
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]
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# BaseSoC ------------------------------------------------------------------------------------------
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class BaseSoC(SoCCore):
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def __init__(self, sys_clk_freq=int(75e6), device="LFE5UM5G", with_ethernet=False,
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with_etherbone=False, with_led_chaser=True, eth_ip="192.168.1.50", eth_phy=0,
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toolchain="trellis", **kwargs):
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platform = versa_ecp5.Platform(toolchain=toolchain, device=device)
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# FIXME: adapt integrated rom size for Microwatt
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if kwargs.get("cpu_type", None) == "microwatt":
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kwargs["integrated_rom_size"] = 0xb000 if with_ethernet else 0x9000
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# SoCCore -----------------------------------------_----------------------------------------
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SoCCore.__init__(self, platform, sys_clk_freq,
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ident = "LiteX SoC on Versa ECP5",
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**kwargs)
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# CRG --------------------------------------------------------------------------------------
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self.submodules.crg = _CRG(platform, sys_clk_freq)
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# DDR3 SDRAM -------------------------------------------------------------------------------
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if not self.integrated_main_ram_size:
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self.submodules.ddrphy = ECP5DDRPHY(
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platform.request("ddram"),
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sys_clk_freq=sys_clk_freq)
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self.comb += self.crg.stop.eq(self.ddrphy.init.stop)
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self.comb += self.crg.reset.eq(self.ddrphy.init.reset)
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self.add_sdram("sdram",
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phy = self.ddrphy,
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module = MT41K64M16(sys_clk_freq, "1:2"),
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l2_cache_size = kwargs.get("l2_size", 8192)
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)
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# Ethernet / Etherbone ---------------------------------------------------------------------
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if with_ethernet or with_etherbone:
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self.submodules.ethphy = LiteEthPHYRGMII(
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clock_pads = self.platform.request("eth_clocks", eth_phy),
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pads = self.platform.request("eth", eth_phy),
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tx_delay = 0e-9,
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rx_delay = 0e-9)
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if with_ethernet:
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self.add_ethernet(phy=self.ethphy)
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if with_etherbone:
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self.add_etherbone(phy=self.ethphy, ip_address=eth_ip)
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# Leds -------------------------------------------------------------------------------------
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if with_led_chaser:
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self.submodules.leds = LedChaser(
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pads = platform.request_all("user_led"),
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sys_clk_freq = sys_clk_freq)
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# Build --------------------------------------------------------------------------------------------
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def main():
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from litex.soc.integration.soc import LiteXSoCArgumentParser
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parser = LiteXSoCArgumentParser(description="LiteX SoC on Versa ECP5")
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target_group = parser.add_argument_group(title="Target options")
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target_group.add_argument("--build", action="store_true", help="Build bitstream.")
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target_group.add_argument("--load", action="store_true", help="Load bitstream.")
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target_group.add_argument("--toolchain", default="trellis", help="FPGA toolchain (trellis or diamond).")
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target_group.add_argument("--sys-clk-freq", default=75e6, help="System clock frequency.")
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target_group.add_argument("--device", default="LFE5UM5G", help="FPGA device (LFE5UM5G or LFE5UM).")
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ethopts = target_group.add_mutually_exclusive_group()
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ethopts.add_argument("--with-ethernet", action="store_true", help="Enable Ethernet support.")
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ethopts.add_argument("--with-etherbone", action="store_true", help="Enable Etherbone support.")
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target_group.add_argument("--eth-ip", default="192.168.1.50", type=str, help="Ethernet/Etherbone IP address.")
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target_group.add_argument("--eth-phy", default=0, type=int, help="Ethernet PHY (0 or 1).")
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builder_args(parser)
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soc_core_args(parser)
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trellis_args(parser)
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args = parser.parse_args()
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soc = BaseSoC(
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sys_clk_freq = int(float(args.sys_clk_freq)),
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device = args.device,
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with_ethernet = args.with_ethernet,
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with_etherbone = args.with_etherbone,
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eth_ip = args.eth_ip,
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eth_phy = args.eth_phy,
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toolchain = args.toolchain,
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**soc_core_argdict(args)
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)
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builder = Builder(soc, **builder_argdict(args))
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builder_kargs = trellis_argdict(args) if args.toolchain == "trellis" else {}
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builder.build(**builder_kargs, run=args.build)
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if args.load:
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prog = soc.platform.create_programmer()
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prog.load_bitstream(builder.get_bitstream_filename(mode="sram", ext=".svf")) # FIXME
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if __name__ == "__main__":
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main()
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