litex-boards/litex_boards/targets/rz_easyfpga.py
2021-09-21 09:55:22 +02:00

105 lines
3.7 KiB
Python
Executable file

#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
# Copyright (c) 2021 Alain Lou <alainzlou@gmail.com>
# SPDX-License-Identifier: BSD-2-Clause
import os
import argparse
from migen import *
from litex.build.io import DDROutput
from litex_boards.platforms import easyfpga
from litex.soc.cores.clock import CycloneIVPLL
from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *
from litex.soc.cores.led import LedChaser
from litedram.modules import MT48LC4M16
from litedram.phy import GENSDRPHY
# CRG ----------------------------------------------------------------------------------------------
class _CRG(Module):
def __init__(self, platform, sys_clk_freq):
self.rst = Signal()
self.clock_domains.cd_sys = ClockDomain()
self.clock_domains.cd_sys_ps = ClockDomain(reset_less=True)
# # #
# Clk / Rst
clk50 = platform.request("clk50")
# PLL
self.submodules.pll = pll = CycloneIVPLL(speedgrade="-8")
self.comb += pll.reset.eq(self.rst)
pll.register_clkin(clk50, 50e6)
pll.create_clkout(self.cd_sys, sys_clk_freq)
pll.create_clkout(self.cd_sys_ps, sys_clk_freq, phase=90)
# SDRAM clock
self.comb += platform.request("sdram_clock").eq(self.cd_sys_ps.clk)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=int(25e6), with_led_chaser=True, **kwargs):
platform = easyfpga.Platform()
# Limit internal rom and sram size
kwargs["integrated_rom_size"] = 0x6200
kwargs["integrated_sram_size"] = 0x1000
# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq,
ident = "LiteX SoC on RZ-EasyFPGA",
ident_version = True,
**kwargs)
# CRG --------------------------------------------------------------------------------------
self.submodules.crg = _CRG(platform, sys_clk_freq)
# SDR SDRAM --------------------------------------------------------------------------------
if not self.integrated_main_ram_size:
self.submodules.sdrphy = GENSDRPHY(platform.request("sdram"), sys_clk_freq)
self.add_sdram("sdram",
phy = self.sdrphy,
module = MT48LC4M16(sys_clk_freq, "1:1"), # Hynix HY57V641620FTP-7
l2_cache_size = 0
)
# 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 RZ-EasyFPGA")
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=25e6, help="System clock frequency (default: 25MHz)")
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 + ".sof"))
if __name__ == "__main__":
main()