111 lines
4.3 KiB
Python
Executable File
111 lines
4.3 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
|
|
#
|
|
# This file is part of LiteX-Boards.
|
|
#
|
|
# Copyright (c) 2020 Antmicro <www.antmicro.com>
|
|
# SPDX-License-Identifier: BSD-2-Clause
|
|
|
|
import os
|
|
import argparse
|
|
|
|
from migen import *
|
|
from migen.genlib.resetsync import AsyncResetSynchronizer
|
|
|
|
from litex_boards.platforms import mercury_xu5
|
|
|
|
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
|
|
|
|
# CRG ----------------------------------------------------------------------------------------------
|
|
|
|
class _CRG(Module):
|
|
def __init__(self, platform, sys_clk_freq):
|
|
self.rst = Signal()
|
|
self.clock_domains.cd_sys = ClockDomain()
|
|
self.clock_domains.cd_sys4x = ClockDomain(reset_less=True)
|
|
self.clock_domains.cd_pll4x = ClockDomain(reset_less=True)
|
|
self.clock_domains.cd_idelay = ClockDomain()
|
|
|
|
# # #
|
|
|
|
self.submodules.pll = pll = USMMCM(speedgrade=-1)
|
|
self.comb += pll.reset.eq(self.rst)
|
|
pll.register_clkin(platform.request("clk100"), 100e6)
|
|
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", name="main_bufgce_div",
|
|
p_BUFGCE_DIVIDE=4,
|
|
i_CE=1, i_I=self.cd_pll4x.clk, o_O=self.cd_sys.clk),
|
|
Instance("BUFGCE", name="main_bufgce",
|
|
i_CE=1, i_I=self.cd_pll4x.clk, o_O=self.cd_sys4x.clk),
|
|
]
|
|
|
|
self.submodules.idelayctrl = USIDELAYCTRL(cd_ref=self.cd_idelay, cd_sys=self.cd_sys)
|
|
|
|
# BaseSoC ------------------------------------------------------------------------------------------
|
|
|
|
class BaseSoC(SoCCore):
|
|
def __init__(self, sys_clk_freq=int(125e6), with_led_chaser=True, **kwargs):
|
|
platform = mercury_xu5.Platform()
|
|
|
|
# SoCCore ----------------------------------------------------------------------------------
|
|
SoCCore.__init__(self, platform, sys_clk_freq,
|
|
ident = "LiteX SoC on Mercury XU5",
|
|
ident_version = True,
|
|
**kwargs)
|
|
|
|
# CRG --------------------------------------------------------------------------------------
|
|
self.submodules.crg = _CRG(platform, sys_clk_freq)
|
|
|
|
# DDR4 SDRAM -------------------------------------------------------------------------------
|
|
if not self.integrated_main_ram_size:
|
|
self.submodules.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"),
|
|
l2_cache_size = kwargs.get("l2_size", 8192)
|
|
)
|
|
|
|
# Leds -------------------------------------------------------------------------------------
|
|
if with_led_chaser:
|
|
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 Mercury XU5")
|
|
parser.add_argument("--build", action="store_true", help="Build bitstream")
|
|
parser.add_argument("--load", action="store_true", help="Load bitstream")
|
|
parser.add_argument("--sys-clk-freq", default=125e6, help="System clock frequency (default: 125MHz)")
|
|
builder_args(parser)
|
|
soc_core_args(parser)
|
|
args = parser.parse_args()
|
|
|
|
soc = BaseSoC(
|
|
sys_clk_freq = int(float(args.sys_clk_freq)),
|
|
**soc_core_argdict(args)
|
|
)
|
|
builder = Builder(soc, **builder_argdict(args))
|
|
builder.build(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()
|