124 lines
4.5 KiB
Python
Executable File
124 lines
4.5 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) 2019 Florent Kermarrec <florent@enjoy-digital.fr>
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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.gen import LiteXModule
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from litex_boards.platforms import camlink_4k
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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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# CRG ----------------------------------------------------------------------------------------------
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class _CRG(LiteXModule):
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def __init__(self, platform, sys_clk_freq):
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self.rst = Signal()
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self.cd_init = ClockDomain()
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self.cd_por = ClockDomain()
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self.cd_sys = ClockDomain()
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self.cd_sys2x = ClockDomain()
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self.cd_sys2x_i = ClockDomain()
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# # #
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self.stop = Signal()
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# clk / rst
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clk27 = platform.request("clk27")
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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(ClockSignal())
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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.pll = pll = ECP5PLL()
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self.comb += pll.reset.eq(~por_done | self.rst)
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pll.register_clkin(clk27, 27e6)
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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, 27e6)
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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.cd_sys2x.rst,
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o_CDIVX = self.cd_sys.clk),
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AsyncResetSynchronizer(self.cd_sys, ~pll.locked)
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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=81e6, toolchain="trellis", with_led_chaser=True, **kwargs):
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platform = camlink_4k.Platform(toolchain=toolchain)
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# CRG --------------------------------------------------------------------------------------
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self.crg = _CRG(platform, sys_clk_freq)
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# SoCCore ----------------------------------------------------------------------------------
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SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Cam Link 4K", **kwargs)
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# DDR3 SDRAM -------------------------------------------------------------------------------
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if not self.integrated_main_ram_size:
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self.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.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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# Leds -------------------------------------------------------------------------------------
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# Disable leds when serial is used.
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if platform.lookup_request("serial", loose=True) is None and with_led_chaser:
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self.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.build.parser import LiteXArgumentParser
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parser = LiteXArgumentParser(platform=camlink_4k.Platform, description="LiteX SoC on Cam Link 4K.")
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parser.add_target_argument("--sys-clk-freq", default=81e6, type=float, help="System clock frequency.")
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args = parser.parse_args()
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soc = BaseSoC(
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sys_clk_freq = args.sys_clk_freq,
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toolchain = args.toolchain,
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**parser.soc_argdict
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)
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builder = Builder(soc, **parser.builder_argdict)
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if args.build:
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builder.build(**parser.toolchain_argdict)
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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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