#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) 2015-2019 Florent Kermarrec # SPDX-License-Identifier: BSD-2-Clause from migen import * from litex.gen import * from litex_boards.platforms import digilent_nexys_video from litex.soc.cores.clock import * from litex.soc.integration.soc_core import * from litex.soc.integration.builder import * from litex.soc.cores.video import VideoS7HDMIPHY from litex.soc.cores.led import LedChaser from litedram.modules import MT41K256M16 from litedram.phy import s7ddrphy from liteeth.phy.s7rgmii import LiteEthPHYRGMII # CRG ---------------------------------------------------------------------------------------------- class _CRG(LiteXModule): def __init__(self, platform, sys_clk_freq, toolchain="vivado", with_video_pll=False): self.rst = Signal() self.cd_sys = ClockDomain() self.cd_sys4x = ClockDomain() self.cd_sys4x_dqs = ClockDomain() self.cd_idelay = ClockDomain() self.cd_hdmi = ClockDomain() self.cd_hdmi5x = ClockDomain() self.cd_clk100 = ClockDomain() # # # # Clk / Rst. clk100 = platform.request("clk100") rst_n = platform.request("cpu_reset") # PLL. if toolchain == "vivado": self.pll = pll = S7MMCM(speedgrade=-1) else: self.pll = pll = S7PLL(speedgrade=-1) self.comb += pll.reset.eq(~rst_n | self.rst) pll.register_clkin(clk100, 100e6) pll.create_clkout(self.cd_sys, sys_clk_freq, reset_buf="bufg") pll.create_clkout(self.cd_sys4x, 4*sys_clk_freq) pll.create_clkout(self.cd_sys4x_dqs, 4*sys_clk_freq, phase=90) pll.create_clkout(self.cd_idelay, 200e6) pll.create_clkout(self.cd_clk100, 100e6) platform.add_false_path_constraints(self.cd_sys.clk, pll.clkin) # Ignore sys_clk to pll.clkin path created by SoC's rst. self.idelayctrl = S7IDELAYCTRL(self.cd_idelay) # Video PLL. if with_video_pll: self.video_pll = video_pll = S7MMCM(speedgrade=-1) video_pll.reset.eq(~rst_n | self.rst) video_pll.register_clkin(clk100, 100e6) video_pll.create_clkout(self.cd_hdmi, 40e6) video_pll.create_clkout(self.cd_hdmi5x, 5*40e6) # BaseSoC ------------------------------------------------------------------------------------------ class BaseSoC(SoCCore): def __init__(self, toolchain="vivado", sys_clk_freq=100e6, with_ethernet = False, with_led_chaser = True, with_sata = False, sata_gen="gen2", vadj = "1.2V", with_video_terminal = False, with_video_framebuffer = False, **kwargs): platform = digilent_nexys_video.Platform(toolchain=toolchain) # CRG -------------------------------------------------------------------------------------- with_video_pll = (with_video_terminal or with_video_framebuffer) self.crg = _CRG(platform, sys_clk_freq, toolchain, with_video_pll = with_video_pll ) # SoCCore ---------------------------------------------------------------------------------- SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on Nexys Video", **kwargs) # DDR3 SDRAM ------------------------------------------------------------------------------- if not self.integrated_main_ram_size: self.ddrphy = s7ddrphy.A7DDRPHY(platform.request("ddram"), memtype = "DDR3", nphases = 4, sys_clk_freq = sys_clk_freq) self.add_sdram("sdram", phy = self.ddrphy, module = MT41K256M16(sys_clk_freq, "1:4"), l2_cache_size = kwargs.get("l2_size", 8192) ) # Ethernet --------------------------------------------------------------------------------- if with_ethernet: self.ethphy = LiteEthPHYRGMII( clock_pads = self.platform.request("eth_clocks"), pads = self.platform.request("eth")) self.add_ethernet(phy=self.ethphy) # SATA ------------------------------------------------------------------------------------- if with_sata: from litex.build.generic_platform import Subsignal, Pins from litesata.phy import LiteSATAPHY # IOs _sata_io = [ # AB09-FMCRAID / https://www.dgway.com/AB09-FMCRAID_E.html ("fmc2sata", 0, Subsignal("clk_p", Pins("LPC:GBTCLK0_M2C_P")), Subsignal("clk_n", Pins("LPC:GBTCLK0_M2C_N")), Subsignal("tx_p", Pins("LPC:DP0_C2M_P")), Subsignal("tx_n", Pins("LPC:DP0_C2M_N")), Subsignal("rx_p", Pins("LPC:DP0_M2C_P")), Subsignal("rx_n", Pins("LPC:DP0_M2C_N")) ), ] platform.add_extension(_sata_io) # RefClk, generate 150MHz from PLL. self.cd_sata_refclk = ClockDomain() self.crg.pll.create_clkout(self.cd_sata_refclk, 150e6) sata_refclk = ClockSignal("sata_refclk") platform.add_platform_command("set_property SEVERITY {{WARNING}} [get_drc_checks REQP-49]") # PHY self.sata_phy = LiteSATAPHY(platform.device, refclk = sata_refclk, pads = platform.request("fmc2sata"), gen = sata_gen, clk_freq = sys_clk_freq, data_width = 16) # Core self.add_sata(phy=self.sata_phy, mode="read+write") # Video ------------------------------------------------------------------------------------ if with_video_terminal or with_video_framebuffer: self.videophy = VideoS7HDMIPHY(platform.request("hdmi_out"), clock_domain="hdmi") if with_video_terminal: self.add_video_terminal(phy=self.videophy, timings="800x600@60Hz", clock_domain="hdmi") if with_video_framebuffer: self.add_video_framebuffer(phy=self.videophy, timings="800x600@60Hz", clock_domain="hdmi") # Leds ------------------------------------------------------------------------------------- if with_led_chaser: self.leds = LedChaser( pads = platform.request_all("user_led"), sys_clk_freq = sys_clk_freq) # VADJ ------------------------------------------------------------------------------------- vadj_map = {"1.2V": 0b00, "1.8V": 0b01, "2.5V": 0b10, "3.3V": 0b11} platform.request_all("vadj").eq(vadj_map[vadj]) # Build -------------------------------------------------------------------------------------------- def main(): from litex.build.parser import LiteXArgumentParser parser = LiteXArgumentParser(platform=digilent_nexys_video.Platform, description="LiteX SoC on Nexys Video.") parser.add_target_argument("--sys-clk-freq", default=100e6, type=float, help="System clock frequency.") parser.add_target_argument("--with-ethernet", action="store_true", help="Enable Ethernet support.") sdopts = parser.target_group.add_mutually_exclusive_group() sdopts.add_argument("--with-spi-sdcard", action="store_true", help="Enable SPI-mode SDCard support.") sdopts.add_argument("--with-sdcard", action="store_true", help="Enable SDCard support.") parser.add_target_argument("--with-sata", action="store_true", help="Enable SATA support (over FMCRAID).") parser.add_target_argument("--sata-gen", default="2", help="SATA Gen.", choices=["1", "2"]) parser.add_target_argument("--vadj", default="1.2V", help="FMC VADJ value.", choices=["1.2V", "1.8V", "2.5V", "3.3V"]) viopts = parser.target_group.add_mutually_exclusive_group() viopts.add_argument("--with-video-terminal", action="store_true", help="Enable Video Terminal (HDMI).") viopts.add_argument("--with-video-framebuffer", action="store_true", help="Enable Video Framebuffer (HDMI).") args = parser.parse_args() soc = BaseSoC( toolchain = args.toolchain, sys_clk_freq = args.sys_clk_freq, with_ethernet = args.with_ethernet, with_sata = args.with_sata, sata_gen = "gen" + args.sata_gen, vadj = args.vadj, with_video_terminal = args.with_video_terminal, with_video_framebuffer = args.with_video_framebuffer, **parser.soc_argdict ) if args.with_spi_sdcard: soc.add_spi_sdcard() if args.with_sdcard: soc.add_sdcard() 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")) if __name__ == "__main__": main()