#!/usr/bin/env python3 # # This file is part of LiteX-Boards. # # Copyright (c) 2020 Hans Baier # SPDX-License-Identifier: BSD-2-Clause from migen import * from litex.gen import * from litex_boards.platforms import terasic_sockit from litex.soc.cores.clock import CycloneVPLL from litex.soc.integration.soc_core import * from litex.soc.integration.builder import * from litex.soc.cores.led import LedChaser from litex.soc.cores.video import VideoVGAPHY from litex.build.io import DDROutput from litedram.modules import W9825G6KH6, AS4C32M16 from litedram.phy import HalfRateGENSDRPHY, GENSDRPHY # CRG ---------------------------------------------------------------------------------------------- class _CRG(LiteXModule): def __init__(self, platform, sys_clk_freq, with_sdram=False, sdram_rate="1:2", with_video_terminal=False): self.sdram_rate = sdram_rate self.rst = Signal() self.cd_sys = ClockDomain() if with_video_terminal: self.cd_vga = ClockDomain() if with_sdram: if sdram_rate == "1:2": self.cd_sys2x = ClockDomain() self.cd_sys2x_ps = ClockDomain() else: self.cd_sys_ps = ClockDomain() # Clk / Rst clk50 = platform.request("clk50") # PLL self.pll = pll = CycloneVPLL(speedgrade="-C6") self.comb += pll.reset.eq(self.rst) pll.register_clkin(clk50, 50e6) pll.create_clkout(self.cd_sys, sys_clk_freq) if with_video_terminal: pll.create_clkout(self.cd_vga, 65e6) if with_sdram: if sdram_rate == "1:2": pll.create_clkout(self.cd_sys2x, 2*sys_clk_freq) pll.create_clkout(self.cd_sys2x_ps, 2*sys_clk_freq, phase=180) # Idealy 90° but needs to be increased. else: pll.create_clkout(self.cd_sys_ps, sys_clk_freq, phase=90) # SDRAM clock if with_sdram: sdram_clk = ClockSignal("sys2x_ps" if sdram_rate == "1:2" else "sys_ps") self.specials += DDROutput(1, 0, platform.request("sdram_clock"), sdram_clk) # BaseSoC ------------------------------------------------------------------------------------------ class BaseSoC(SoCCore): def __init__(self, sys_clk_freq=50e6, revision="revd", sdram_rate="1:2", mister_sdram=None, with_led_chaser = True, with_video_terminal = False, **kwargs): platform = terasic_sockit.Platform(revision) # CRG -------------------------------------------------------------------------------------- self.crg = _CRG(platform, sys_clk_freq, with_sdram = mister_sdram != None, sdram_rate = sdram_rate, with_video_terminal = with_video_terminal ) # SoCCore ---------------------------------------------------------------------------------- if kwargs.get("uart_name", "serial") == "serial": kwargs["uart_name"] = "jtag_uart" # Defaults to JTAG-UART. SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on the Terasic SoCKit", **kwargs) # SDR SDRAM -------------------------------------------------------------------------------- if mister_sdram is not None: sdrphy_cls = HalfRateGENSDRPHY if sdram_rate == "1:2" else GENSDRPHY sdrphy_mod = {"xs_v22": W9825G6KH6, "xs_v24": AS4C32M16}[mister_sdram] self.sdrphy = sdrphy_cls(platform.request("sdram"), sys_clk_freq) self.add_sdram("sdram", phy = self.sdrphy, module = sdrphy_mod(sys_clk_freq, sdram_rate), l2_cache_size = kwargs.get("l2_size", 8192) ) # Video Terminal --------------------------------------------------------------------------- if with_video_terminal: vga_pads = platform.request("vga") self.comb += [ vga_pads.sync_n.eq(0), vga_pads.blank_n.eq(1) ] self.specials += DDROutput(i1=1, i2=0, o=vga_pads.clk, clk=ClockSignal("vga")) self.videophy = VideoVGAPHY(vga_pads, clock_domain="vga") self.add_video_terminal(phy=self.videophy, timings="1024x768@60Hz", clock_domain="vga") # Leds ------------------------------------------------------------------------------------- if with_led_chaser: self.leds = LedChaser( pads = platform.request_all("user_led"), sys_clk_freq = sys_clk_freq) # Build -------------------------------------------------------------------------------------------- def main(): from litex.build.parser import LiteXArgumentParser parser = LiteXArgumentParser(platform=terasic_sockit.Platform, description="LiteX SoC on the Terasic SoCKit.") parser.add_target_argument("--single-rate-sdram", action="store_true", help="Clock SDRAM with 1x the sytem clock (instead of 2x).") parser.add_target_argument("--mister-sdram-xs-v22", action="store_true", help="Use optional MiSTer SDRAM module XS v2.2 on J2 on GPIO daughter card.") parser.add_target_argument("--mister-sdram-xs-v24", action="store_true", help="Use optional MiSTer SDRAM module XS v2.4 on J2 on GPIO daughter card.") parser.add_target_argument("--revision", default="revd", help="Board revision (revb, revc or revd).") parser.add_target_argument("--sys-clk-freq", default=50e6, type=float, help="System clock frequency.") parser.add_target_argument("--with-video-terminal", action="store_true", help="Enable Video Terminal (VGA).") args = parser.parse_args() soc = BaseSoC( sys_clk_freq = args.sys_clk_freq, revision = args.revision, sdram_rate = "1:1" if args.single_rate_sdram else "1:2", mister_sdram = "xs_v22" if args.mister_sdram_xs_v22 else "xs_v24" if args.mister_sdram_xs_v24 else None, with_video_terminal = args.with_video_terminal, **parser.soc_argdict ) 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()