From a8cbe4ad8416f7ea4af8be4cf3cb2616ddc78c90 Mon Sep 17 00:00:00 2001 From: Florent Kermarrec Date: Tue, 7 May 2019 13:05:28 +0200 Subject: [PATCH] boards/targets/minispartan6: for now revert experimental s6pll clocking --- litex/boards/targets/minispartan6.py | 50 +++++++++++++++++++++++++--- 1 file changed, 45 insertions(+), 5 deletions(-) diff --git a/litex/boards/targets/minispartan6.py b/litex/boards/targets/minispartan6.py index 9f745282..20e2113e 100755 --- a/litex/boards/targets/minispartan6.py +++ b/litex/boards/targets/minispartan6.py @@ -18,7 +18,7 @@ from litedram.phy import GENSDRPHY # CRG ---------------------------------------------------------------------------------------------- class _CRG(Module): - def __init__(self, platform, clk_freq): + def __init__(self, platform, clk_freq, use_s6pll=False): self.clock_domains.cd_sys = ClockDomain() self.clock_domains.cd_sys_ps = ClockDomain() @@ -27,10 +27,50 @@ class _CRG(Module): self.cd_sys.clk.attr.add("keep") self.cd_sys_ps.clk.attr.add("keep") - self.submodules.pll = pll = S6PLL(speedgrade=-1) - pll.register_clkin(platform.request("clk32"), 32e6) - pll.create_clkout(self.cd_sys, clk_freq) - pll.create_clkout(self.cd_sys_ps, clk_freq, phase=270) + if use_s6pll: + self.submodules.pll = pll = S6PLL(speedgrade=-1) + pll.register_clkin(platform.request("clk32"), 32e6) + pll.create_clkout(self.cd_sys, clk_freq) + pll.create_clkout(self.cd_sys_ps, clk_freq, phase=270) + else: + f0 = 32*1000000 + clk32 = platform.request("clk32") + clk32a = Signal() + self.specials += Instance("IBUFG", i_I=clk32, o_O=clk32a) + clk32b = Signal() + self.specials += Instance("BUFIO2", p_DIVIDE=1, + p_DIVIDE_BYPASS="TRUE", p_I_INVERT="FALSE", + i_I=clk32a, o_DIVCLK=clk32b) + f = Fraction(int(clk_freq), int(f0)) + n, m, p = f.denominator, f.numerator, 8 + assert f0/n*m == clk_freq + pll_lckd = Signal() + pll_fb = Signal() + pll = Signal(6) + self.specials.pll = Instance("PLL_ADV", p_SIM_DEVICE="SPARTAN6", + p_BANDWIDTH="OPTIMIZED", p_COMPENSATION="INTERNAL", + p_REF_JITTER=.01, p_CLK_FEEDBACK="CLKFBOUT", + i_DADDR=0, i_DCLK=0, i_DEN=0, i_DI=0, i_DWE=0, i_RST=0, i_REL=0, + p_DIVCLK_DIVIDE=1, p_CLKFBOUT_MULT=m*p//n, p_CLKFBOUT_PHASE=0., + i_CLKIN1=clk32b, i_CLKIN2=0, i_CLKINSEL=1, + p_CLKIN1_PERIOD=1000000000/f0, p_CLKIN2_PERIOD=0., + i_CLKFBIN=pll_fb, o_CLKFBOUT=pll_fb, o_LOCKED=pll_lckd, + o_CLKOUT0=pll[0], p_CLKOUT0_DUTY_CYCLE=.5, + o_CLKOUT1=pll[1], p_CLKOUT1_DUTY_CYCLE=.5, + o_CLKOUT2=pll[2], p_CLKOUT2_DUTY_CYCLE=.5, + o_CLKOUT3=pll[3], p_CLKOUT3_DUTY_CYCLE=.5, + o_CLKOUT4=pll[4], p_CLKOUT4_DUTY_CYCLE=.5, + o_CLKOUT5=pll[5], p_CLKOUT5_DUTY_CYCLE=.5, + p_CLKOUT0_PHASE=0., p_CLKOUT0_DIVIDE=p//1, + p_CLKOUT1_PHASE=0., p_CLKOUT1_DIVIDE=p//1, + p_CLKOUT2_PHASE=0., p_CLKOUT2_DIVIDE=p//1, + p_CLKOUT3_PHASE=0., p_CLKOUT3_DIVIDE=p//1, + p_CLKOUT4_PHASE=0., p_CLKOUT4_DIVIDE=p//1, # sys + p_CLKOUT5_PHASE=270., p_CLKOUT5_DIVIDE=p//1, # sys_ps + ) + self.specials += Instance("BUFG", i_I=pll[4], o_O=self.cd_sys.clk) + self.specials += Instance("BUFG", i_I=pll[5], o_O=self.cd_sys_ps.clk) + self.specials += AsyncResetSynchronizer(self.cd_sys, ~pll_lckd) self.specials += Instance("ODDR2", p_DDR_ALIGNMENT="NONE", p_INIT=0, p_SRTYPE="SYNC", -- 2.30.2