123 lines
4.8 KiB
Python
Executable File
123 lines
4.8 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) 2019-2020 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 litex.gen import *
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from litex.build.io import DDROutput
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from litex_boards.platforms import linsn_rv901t
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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 S6PLL
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from litex.soc.cores.led import LedChaser
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from litedram.modules import M12L64322A
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from litedram.phy import GENSDRPHY
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from liteeth.phy.s6rgmii import LiteEthPHYRGMII
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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_sys_ps = ClockDomain()
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# # #
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clk25 = platform.request("clk25")
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self.pll = pll = S6PLL(speedgrade=-2)
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self.comb += pll.reset.eq(self.rst)
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pll.register_clkin(clk25, 25e6)
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pll.create_clkout(self.cd_sys, sys_clk_freq)
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pll.create_clkout(self.cd_sys_ps, sys_clk_freq, phase=90)
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# SDRAM clock
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self.specials += DDROutput(1, 0, platform.request("sdram_clock"), ClockSignal("sys_ps"))
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# BaseSoC ------------------------------------------------------------------------------------------
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class BaseSoC(SoCCore):
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def __init__(self, sys_clk_freq=75e6,
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with_ethernet = False,
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with_etherbone = False,
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eth_phy = 0,
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with_led_chaser = True,
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**kwargs):
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platform = linsn_rv901t.Platform()
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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 Linsn RV901T", **kwargs)
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# SDR SDRAM --------------------------------------------------------------------------------
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if not self.integrated_main_ram_size:
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self.sdrphy = GENSDRPHY(platform.request("sdram"), sys_clk_freq)
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self.add_sdram("sdram",
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phy = self.sdrphy,
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module = M12L64322A(sys_clk_freq, "1:1"),
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l2_cache_size = kwargs.get("l2_size", 8192)
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)
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# Ethernet / Etherbone ---------------------------------------------------------------------
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if with_ethernet or with_etherbone:
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self.ethphy = LiteEthPHYRGMII(
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clock_pads = self.platform.request("eth_clocks", eth_phy),
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pads = self.platform.request("eth", eth_phy),
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tx_delay = 0e-9)
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if with_ethernet:
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self.add_ethernet(phy=self.ethphy, with_timing_constraints=False)
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if with_etherbone:
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self.add_etherbone(phy=self.ethphy, with_timing_constraints=False)
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# Timing Constraints.
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platform.add_period_constraint(platform.lookup_request("eth_clocks", eth_phy).rx, 1e9/125e6)
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platform.add_false_path_constraints(self.crg.cd_sys.clk, platform.lookup_request("eth_clocks", eth_phy).rx)
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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=linsn_rv901t.Platform, description="LiteX SoC on Linsn RV901T.")
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parser.add_target_argument("--sys-clk-freq", default=75e6, type=float, help="System clock frequency.")
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ethopts = parser.target_group.add_mutually_exclusive_group()
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ethopts.add_argument("--with-ethernet", action="store_true", help="Enable Ethernet support.")
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ethopts.add_argument("--with-etherbone", action="store_true", help="Enable Etherbone support.")
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parser.add_target_argument("--eth-phy", default=0, type=int, help="Ethernet PHY (0 or 1).")
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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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with_ethernet = args.with_ethernet,
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with_etherbone = args.with_etherbone,
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eth_phy = int(args.eth_phy),
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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 __name__ == "__main__":
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main()
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