litex-boards/litex_boards/targets/camlink_4k.py

124 lines
4.5 KiB
Python
Executable File

#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2019 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 LiteXModule
from litex_boards.platforms import camlink_4k
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 MT41K64M16
from litedram.phy import ECP5DDRPHY
# CRG ----------------------------------------------------------------------------------------------
class _CRG(LiteXModule):
def __init__(self, platform, sys_clk_freq):
self.rst = Signal()
self.cd_init = ClockDomain()
self.cd_por = ClockDomain()
self.cd_sys = ClockDomain()
self.cd_sys2x = ClockDomain()
self.cd_sys2x_i = ClockDomain()
# # #
self.stop = Signal()
# clk / rst
clk27 = platform.request("clk27")
# power on reset
por_count = Signal(16, reset=2**16-1)
por_done = Signal()
self.comb += self.cd_por.clk.eq(ClockSignal())
self.comb += por_done.eq(por_count == 0)
self.sync.por += If(~por_done, por_count.eq(por_count - 1))
# pll
self.pll = pll = ECP5PLL()
self.comb += pll.reset.eq(~por_done | self.rst)
pll.register_clkin(clk27, 27e6)
pll.create_clkout(self.cd_sys2x_i, 2*sys_clk_freq)
pll.create_clkout(self.cd_init, 27e6)
self.specials += [
Instance("ECLKSYNCB",
i_ECLKI = self.cd_sys2x_i.clk,
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.cd_sys2x.rst,
o_CDIVX = self.cd_sys.clk),
AsyncResetSynchronizer(self.cd_sys, ~pll.locked)
]
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=81e6, toolchain="trellis", with_led_chaser=True, **kwargs):
platform = camlink_4k.Platform(toolchain=toolchain)
# CRG --------------------------------------------------------------------------------------
self.crg = _CRG(platform, sys_clk_freq)
# SoCCore ----------------------------------------------------------------------------------
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Cam Link 4K", **kwargs)
# DDR3 SDRAM -------------------------------------------------------------------------------
if not self.integrated_main_ram_size:
self.ddrphy = ECP5DDRPHY(
platform.request("ddram"),
sys_clk_freq=sys_clk_freq)
self.comb += self.crg.stop.eq(self.ddrphy.init.stop)
self.add_sdram("sdram",
phy = self.ddrphy,
module = MT41K64M16(sys_clk_freq, "1:2"),
l2_cache_size = kwargs.get("l2_size", 8192)
)
# Leds -------------------------------------------------------------------------------------
# Disable leds when serial is used.
if platform.lookup_request("serial", loose=True) is None and 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=camlink_4k.Platform, description="LiteX SoC on Cam Link 4K.")
parser.add_target_argument("--sys-clk-freq", default=81e6, type=float, help="System clock frequency.")
args = parser.parse_args()
soc = BaseSoC(
sys_clk_freq = args.sys_clk_freq,
toolchain = args.toolchain,
**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", ext=".svf")) # FIXME
if __name__ == "__main__":
main()