litex-boards/litex_boards/targets/xilinx_zcu106.py

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#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2022 Florent Kermarrec <florent@enjoy-digital.fr>
# SPDX-License-Identifier: BSD-2-Clause
from migen import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from litex.gen import *
from litex_boards.platforms import xilinx_zcu106
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 MT40A256M16
from litedram.phy import usddrphy
from litepcie.phy.usppciephy import USPPCIEPHY
from litepcie.software import generate_litepcie_software
# CRG ----------------------------------------------------------------------------------------------
class _CRG(LiteXModule):
def __init__(self, platform, sys_clk_freq):
self.rst = Signal()
self.cd_sys = ClockDomain()
self.cd_sys4x = ClockDomain()
self.cd_pll4x = ClockDomain()
self.cd_idelay = ClockDomain()
# # #
clk125 = platform.request("clk125")
rst = platform.request("rst")
self.pll = pll = USMMCM(speedgrade=-2)
self.comb += pll.reset.eq(self.rst | rst)
pll.register_clkin(clk125, 125e6)
pll.create_clkout(self.cd_pll4x, sys_clk_freq*4, buf=None, with_reset=False)
pll.create_clkout(self.cd_idelay, 500e6)
platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst.
self.specials += [
Instance("BUFGCE_DIV",
p_BUFGCE_DIVIDE=4,
i_CE=1, i_I=self.cd_pll4x.clk, o_O=self.cd_sys.clk),
Instance("BUFGCE",
i_CE=1, i_I=self.cd_pll4x.clk, o_O=self.cd_sys4x.clk),
]
self.idelayctrl = USIDELAYCTRL(cd_ref=self.cd_idelay, cd_sys=self.cd_sys)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=125e6, with_led_chaser=True, with_pcie=False, **kwargs):
platform = xilinx_zcu106.Platform()
# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on ZCU106", **kwargs)
# CRG --------------------------------------------------------------------------------------
self.crg = _CRG(platform, sys_clk_freq)
# DDR4 SDRAM -------------------------------------------------------------------------------
if not self.integrated_main_ram_size:
self.ddrphy = usddrphy.USPDDRPHY(platform.request("ddram"),
memtype = "DDR4",
sys_clk_freq = sys_clk_freq,
iodelay_clk_freq = 500e6)
self.add_sdram("sdram",
phy = self.ddrphy,
module = MT40A256M16(sys_clk_freq, "1:4"),
size = 0x20000000,
l2_cache_size = kwargs.get("l2_size", 8192)
)
# PCIe -------------------------------------------------------------------------------------
if with_pcie:
self.pcie_phy = USPPCIEPHY(platform, platform.request("pcie_x4"),
speed = "gen3",
data_width = 128,
bar0_size = 0x20000)
self.add_pcie(phy=self.pcie_phy, ndmas=1)
# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
self.leds = LedChaser(
pads = platform.request_all("user_led"),
sys_clk_freq = sys_clk_freq)
# Build --------------------------------------------------------------------------------------------
def main():
from litex.build.parser import LiteXArgumentParser
parser = LiteXArgumentParser(platform=xilinx_zcu106.Platform, description="LiteX SoC on ZCU106.")
parser.add_target_argument("--sys-clk-freq", default=125e6, type=float, help="System clock frequency.")
parser.add_target_argument("--with-pcie", action="store_true", help="Enable PCIe support")
args = parser.parse_args()
soc = BaseSoC(
sys_clk_freq = args.sys_clk_freq,
with_pcie = args.with_pcie,
**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()
prog.load_bitstream(builder.get_bitstream_filename(mode="sram"))
if __name__ == "__main__":
main()