From 2b5a6f1058fb7d38573b48e3a65572604dacf72a Mon Sep 17 00:00:00 2001 From: Florent Kermarrec Date: Tue, 8 Jan 2019 14:14:28 +0100 Subject: [PATCH] targets/kcu105: use USMMCM --- litex/boards/targets/kcu105.py | 42 ++++++++++------------------------ 1 file changed, 12 insertions(+), 30 deletions(-) diff --git a/litex/boards/targets/kcu105.py b/litex/boards/targets/kcu105.py index 2025c497..d4c04fa6 100755 --- a/litex/boards/targets/kcu105.py +++ b/litex/boards/targets/kcu105.py @@ -16,44 +16,26 @@ from litedram.phy import usddrphy class _CRG(Module): - def __init__(self, platform): + def __init__(self, platform, sys_clk_freq): self.clock_domains.cd_sys = ClockDomain() self.clock_domains.cd_sys4x = ClockDomain(reset_less=True) self.clock_domains.cd_clk200 = ClockDomain() self.clock_domains.cd_ic = ClockDomain() - clk125 = platform.request("clk125") - clk125_ibufds = Signal() - clk125_buffered = Signal() - pll_locked = Signal() - pll_fb = Signal() - pll_sys4x = Signal() - pll_clk200 = Signal() + self.submodules.pll = pll = USMMCM(speedgrade=-2) + self.comb += pll.reset.eq(platform.request("cpu_reset")) + self.clock_domains.cd_pll4x = ClockDomain(reset_less=True) + pll.register_clkin(platform.request("clk125"), 125e6) + pll.create_clkout(self.cd_pll4x, sys_clk_freq*4, buf=None, with_reset=False) + pll.create_clkout(self.cd_clk200, 200e6, with_reset=False) + self.specials += [ - Instance("IBUFDS", i_I=clk125.p, i_IB=clk125.n, o_O=clk125_ibufds), - Instance("BUFG", i_I=clk125_ibufds, o_O=clk125_buffered), - Instance("PLLE2_BASE", name="crg_main_mmcm", - i_RST=platform.request("cpu_reset"), - p_STARTUP_WAIT="FALSE", o_LOCKED=pll_locked, - - # VCO @ 1GHz - p_REF_JITTER1=0.01, p_CLKIN1_PERIOD=8.0, - p_CLKFBOUT_MULT=8, p_DIVCLK_DIVIDE=1, - i_CLKIN1=clk125_buffered, i_CLKFBIN=pll_fb, o_CLKFBOUT=pll_fb, - - # 500MHz - p_CLKOUT0_DIVIDE=2, p_CLKOUT0_PHASE=0.0, o_CLKOUT0=pll_sys4x, - - # 200MHz - p_CLKOUT1_DIVIDE=5, p_CLKOUT1_PHASE=0.0, o_CLKOUT1=pll_clk200, - ), Instance("BUFGCE_DIV", name="main_bufgce_div", p_BUFGCE_DIVIDE=4, - i_CE=1, i_I=pll_sys4x, o_O=self.cd_sys.clk), + i_CE=1, i_I=self.cd_pll4x.clk, o_O=self.cd_sys.clk), Instance("BUFGCE", name="main_bufgce", - i_CE=1, i_I=pll_sys4x, o_O=self.cd_sys4x.clk), - Instance("BUFG", i_I=pll_clk200, o_O=self.cd_clk200.clk), - AsyncResetSynchronizer(self.cd_clk200, ~pll_locked), + i_CE=1, i_I=self.cd_pll4x.clk, o_O=self.cd_sys4x.clk), + AsyncResetSynchronizer(self.cd_clk200, ~pll.locked), ] ic_reset_counter = Signal(max=64, reset=63) @@ -98,7 +80,7 @@ class BaseSoC(SoCSDRAM): integrated_sram_size=0x8000, **kwargs) - self.submodules.crg = _CRG(platform) + self.submodules.crg = _CRG(platform, sys_clk_freq) # sdram self.submodules.ddrphy = usddrphy.USDDRPHY(platform.request("ddram"), memtype="DDR4", sys_clk_freq=sys_clk_freq) -- 2.30.2