95 lines
3.2 KiB
Python
95 lines
3.2 KiB
Python
from fractions import Fraction
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from migen.fhdl.std import *
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from migen.genlib.resetsync import AsyncResetSynchronizer
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from misoclib import spiflash, sdram
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from misoclib.sdram.phy import gensdrphy
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from misoclib.gensoc import SDRAMSoC
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class _CRG(Module):
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def __init__(self, platform, clk_freq):
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self.clock_domains.cd_sys = ClockDomain()
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self.clock_domains.cd_sys_ps = ClockDomain()
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f0 = 32*1000*1000
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clk32 = platform.request("clk32")
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clk32a = Signal()
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self.specials += Instance("IBUFG", i_I=clk32, o_O=clk32a)
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clk32b = Signal()
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self.specials += Instance("BUFIO2", p_DIVIDE=1,
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p_DIVIDE_BYPASS="TRUE", p_I_INVERT="FALSE",
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i_I=clk32a, o_DIVCLK=clk32b)
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f = Fraction(int(clk_freq), int(f0))
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n, m, p = f.denominator, f.numerator, 8
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assert f0/n*m == clk_freq
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pll_lckd = Signal()
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pll_fb = Signal()
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pll = Signal(6)
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self.specials.pll = Instance("PLL_ADV", p_SIM_DEVICE="SPARTAN6",
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p_BANDWIDTH="OPTIMIZED", p_COMPENSATION="INTERNAL",
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p_REF_JITTER=.01, p_CLK_FEEDBACK="CLKFBOUT",
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i_DADDR=0, i_DCLK=0, i_DEN=0, i_DI=0, i_DWE=0, i_RST=0, i_REL=0,
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p_DIVCLK_DIVIDE=1, p_CLKFBOUT_MULT=m*p//n, p_CLKFBOUT_PHASE=0.,
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i_CLKIN1=clk32b, i_CLKIN2=0, i_CLKINSEL=1,
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p_CLKIN1_PERIOD=1/f0, p_CLKIN2_PERIOD=0.,
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i_CLKFBIN=pll_fb, o_CLKFBOUT=pll_fb, o_LOCKED=pll_lckd,
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o_CLKOUT0=pll[0], p_CLKOUT0_DUTY_CYCLE=.5,
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o_CLKOUT1=pll[1], p_CLKOUT1_DUTY_CYCLE=.5,
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o_CLKOUT2=pll[2], p_CLKOUT2_DUTY_CYCLE=.5,
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o_CLKOUT3=pll[3], p_CLKOUT3_DUTY_CYCLE=.5,
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o_CLKOUT4=pll[4], p_CLKOUT4_DUTY_CYCLE=.5,
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o_CLKOUT5=pll[5], p_CLKOUT5_DUTY_CYCLE=.5,
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p_CLKOUT0_PHASE=0., p_CLKOUT0_DIVIDE=p//1,
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p_CLKOUT1_PHASE=0., p_CLKOUT1_DIVIDE=p//1,
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p_CLKOUT2_PHASE=0., p_CLKOUT2_DIVIDE=p//1,
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p_CLKOUT3_PHASE=0., p_CLKOUT3_DIVIDE=p//1,
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p_CLKOUT4_PHASE=0., p_CLKOUT4_DIVIDE=p//1, # sys
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p_CLKOUT5_PHASE=270., p_CLKOUT5_DIVIDE=p//1, # sys_ps
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)
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self.specials += Instance("BUFG", i_I=pll[4], o_O=self.cd_sys.clk)
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self.specials += Instance("BUFG", i_I=pll[5], o_O=self.cd_sys_ps.clk)
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self.specials += AsyncResetSynchronizer(self.cd_sys, ~pll_lckd)
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self.specials += Instance("ODDR2", p_DDR_ALIGNMENT="NONE",
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p_INIT=0, p_SRTYPE="SYNC",
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i_D0=0, i_D1=1, i_S=0, i_R=0, i_CE=1,
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i_C0=self.cd_sys.clk, i_C1=~self.cd_sys.clk,
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o_Q=platform.request("sdram_clock"))
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class BaseSoC(SDRAMSoC):
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default_platform = "papilio_pro"
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def __init__(self, platform, **kwargs):
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clk_freq = 80*1000*1000
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SDRAMSoC.__init__(self, platform, clk_freq,
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cpu_reset_address=0x60000, **kwargs)
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self.submodules.crg = _CRG(platform, clk_freq)
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sdram_geom = sdram.GeomSettings(
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bank_a=2,
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row_a=12,
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col_a=8
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)
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sdram_timing = sdram.TimingSettings(
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tRP=self.ns(15),
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tRCD=self.ns(15),
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tWR=self.ns(14),
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tWTR=2,
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tREFI=self.ns(64*1000*1000/4096, False),
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tRFC=self.ns(66),
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req_queue_size=8,
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read_time=32,
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write_time=16
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)
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self.submodules.sdrphy = gensdrphy.GENSDRPHY(platform.request("sdram"))
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self.register_sdram_phy(self.sdrphy.dfi, self.sdrphy.phy_settings, sdram_geom, sdram_timing)
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# BIOS is in SPI flash
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self.submodules.spiflash = spiflash.SpiFlash(platform.request("spiflash2x"), dummy=4, div=6)
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self.flash_boot_address = 0x70000
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self.register_rom(self.spiflash.bus)
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default_subtarget = BaseSoC
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