119 lines
4.7 KiB
Python
Executable File
119 lines
4.7 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) 2021 Nathaniel Lewis <github@nrlewis.dev>
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# SPDX-License-Identifier: BSD-2-Clause
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from migen import *
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from litex.gen import LiteXModule
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from litex_boards.platforms import alchitry_au
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from litex.soc.interconnect.csr 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.clock import *
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from litex.soc.cores.led import LedChaser
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from litedram.modules import AS4C128M16
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from litedram.phy import s7ddrphy
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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_sys = ClockDomain()
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self.cd_sys4x = ClockDomain()
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self.cd_sys4x_dqs = ClockDomain()
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self.cd_idelay = ClockDomain()
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# Clk/Rst
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clk100 = platform.request("clk100")
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# PLL
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self.pll = pll = S7PLL()
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self.comb += pll.reset.eq(~platform.request("cpu_reset") | self.rst)
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pll.register_clkin(clk100, 100e6)
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pll.create_clkout(self.cd_sys, sys_clk_freq)
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pll.create_clkout(self.cd_sys4x, 4*sys_clk_freq)
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pll.create_clkout(self.cd_sys4x_dqs, 4*sys_clk_freq, phase=90)
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pll.create_clkout(self.cd_idelay, 200e6)
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platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst.
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self.idelayctrl = S7IDELAYCTRL(self.cd_idelay)
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# BaseSoC -----------------------------------------------------------------------------------------
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class BaseSoC(SoCCore):
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def __init__(self, variant="au", sys_clk_freq=int(83333333), with_spi_flash=False, with_led_chaser=True, **kwargs):
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platform = alchitry_au.Platform(variant=variant)
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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 Alchitry Au(+)", **kwargs)
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# DDR3 SDRAM -------------------------------------------------------------------------------
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if not self.integrated_main_ram_size:
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self.ddrphy = s7ddrphy.A7DDRPHY(platform.request("ddram"),
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memtype = "DDR3",
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nphases = 4,
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sys_clk_freq = sys_clk_freq,
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iodelay_clk_freq = 200e6)
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self.add_sdram("sdram",
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phy = self.ddrphy,
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module = AS4C128M16(sys_clk_freq, "1:4"),
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l2_cache_size = kwargs.get("l2_size", 8192)
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)
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# SPI Flash --------------------------------------------------------------------------------
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if with_spi_flash:
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from litespi.modules import SST26VF032B
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from litespi.opcodes import SpiNorFlashOpCodes as Codes
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self.add_spi_flash(mode="4x", module=SST26VF032B(Codes.READ_1_1_1), with_master=True)
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# Leds -------------------------------------------------------------------------------------
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if 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=alchitry_au.Platform, description="LiteX SoC on Alchitry Au(+)")
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parser.add_target_argument("--flash", action="store_true", help="Flash bitstream.")
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parser.add_target_argument("--variant", default="au", help="Board variant (au or au+).")
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parser.add_target_argument("--sys-clk-freq", default=83333333, help="System clock frequency.")
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parser.add_target_argument("--with-spi-flash", action="store_true", help="Enable SPI Flash (MMAPed).")
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args = parser.parse_args()
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soc = BaseSoC(
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variant = args.variant,
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sys_clk_freq = int(float(args.sys_clk_freq)),
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with_spi_flash = args.with_spi_flash,
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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"))
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if args.flash:
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prog = soc.platform.create_programmer()
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prog.flash(0, builder.get_bitstream_filename(mode="flash"))
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if __name__ == "__main__":
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main()
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