#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) 2020 Florent Kermarrec # SPDX-License-Identifier: BSD-2-Clause import os from migen import * from migen.genlib.resetsync import AsyncResetSynchronizer from litex_boards.platforms import pano_logic_g2 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 liteeth.phy import LiteEthPHY # CRG ---------------------------------------------------------------------------------------------- class _CRG(Module): def __init__(self, platform, clk_freq, with_ethernet=False): self.rst = Signal() self.clock_domains.cd_sys = ClockDomain() # # # if not with_ethernet: # Take Ethernet PHY out of reset to enable 125MHz on clk125 (25MHz otherwise). # See https://github.com/tomverbeure/panologic-g2#fpga-external-clocking-architecture self.comb += platform.request("eth_rst_n").eq(1) self.submodules.pll = pll = S6PLL(speedgrade=-2) self.comb += pll.reset.eq(~platform.request("user_btn_n") | self.rst) pll.register_clkin(platform.request("clk125"), 125e6) pll.create_clkout(self.cd_sys, clk_freq) platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst. # BaseSoC ------------------------------------------------------------------------------------------ class BaseSoC(SoCCore): def __init__(self, revision, sys_clk_freq=int(50e6), with_ethernet=False, with_etherbone=False, eth_ip="192.168.1.50", with_led_chaser=True, **kwargs): platform = pano_logic_g2.Platform(revision=revision) if with_etherbone: sys_clk_freq = int(125e6) # CRG -------------------------------------------------------------------------------------- with_ethernet = (with_ethernet or with_etherbone) self.submodules.crg = _CRG(platform, sys_clk_freq, with_ethernet=with_ethernet) # SoCCore ---------------------------------------------------------------------------------- SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Pano Logic G2", **kwargs) # Ethernet / Etherbone --------------------------------------------------------------------- if with_ethernet or with_etherbone: self.submodules.ethphy = LiteEthPHY( clock_pads = self.platform.request("eth_clocks"), pads = self.platform.request("eth"), clk_freq = sys_clk_freq, with_hw_init_reset = False) if with_ethernet: self.add_ethernet(phy=self.ethphy) if with_etherbone: self.add_etherbone(phy=self.ethphy, ip_address=eth_ip) # Leds ------------------------------------------------------------------------------------- if with_led_chaser: self.submodules.leds = LedChaser( pads = platform.request_all("user_led"), sys_clk_freq = sys_clk_freq) # Build -------------------------------------------------------------------------------------------- def main(): from litex.soc.integration.soc import LiteXSoCArgumentParser parser = LiteXSoCArgumentParser(description="LiteX SoC on Pano Logic G2") target_group = parser.add_argument_group(title="Target options") target_group.add_argument("--build", action="store_true", help="Build bitstream.") target_group.add_argument("--load", action="store_true", help="Load bitstream.") target_group.add_argument("--revision", default="c", help="Board revision (b or c).") target_group.add_argument("--sys-clk-freq", default=50e6, help="System clock frequency.") ethopts = target_group.add_mutually_exclusive_group() ethopts.add_argument("--with-ethernet", action="store_true", help="Enable Ethernet support.") ethopts.add_argument("--with-etherbone", action="store_true", help="Enable Etherbone support.") target_group.add_argument("--eth-ip", default="192.168.1.50", type=str, help="Ethernet/Etherbone IP address.") builder_args(parser) soc_core_args(parser) args = parser.parse_args() soc = BaseSoC( revision = args.revision, sys_clk_freq = int(float(args.sys_clk_freq)), with_ethernet = args.with_ethernet, with_etherbone = args.with_etherbone, eth_ip = args.eth_ip, **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(builder.get_bitstream_filename(mode="sram")) if __name__ == "__main__": main()