diff --git a/targets/pipistrello.py b/targets/pipistrello.py new file mode 100644 index 000000000..069ff48e6 --- /dev/null +++ b/targets/pipistrello.py @@ -0,0 +1,105 @@ +from fractions import Fraction + +from migen.fhdl.std import * +from migen.genlib.resetsync import AsyncResetSynchronizer + +from misoclib import spiflash, sdram +from misoclib.sdram.phy import gensdrphy +from misoclib.gensoc import SDRAMSoC + +class _CRG(Module): + def __init__(self, platform, clk_freq): + self.clock_domains.cd_sys = ClockDomain() + self.clock_domains.cd_sys_ps = ClockDomain() + + f0 = 50*1000*1000 + clk50 = platform.request("clk50") + clk50a = Signal() + self.specials += Instance("IBUFG", i_I=clk50, o_O=clk50a) + clk50b = Signal() + self.specials += Instance("BUFIO2", p_DIVIDE=1, + p_DIVIDE_BYPASS="TRUE", p_I_INVERT="FALSE", + i_I=clk50a, o_DIVCLK=clk50b) + 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=clk50b, i_CLKIN2=0, i_CLKINSEL=1, + p_CLKIN1_PERIOD=1/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) + + clk = platform.request("sdram_clock") + self.specials += Instance("ODDR2", p_DDR_ALIGNMENT="NONE", + p_INIT=0, p_SRTYPE="SYNC", + i_D0=0, i_D1=1, i_S=0, i_R=0, i_CE=1, + i_C0=self.cd_sys.clk, i_C1=~self.cd_sys.clk, + o_Q=clk.p) + self.specials += Instance("ODDR2", p_DDR_ALIGNMENT="NONE", + p_INIT=0, p_SRTYPE="SYNC", + i_D0=1, i_D1=0, i_S=0, i_R=0, i_CE=1, + i_C0=self.cd_sys.clk, i_C1=~self.cd_sys.clk, + o_Q=clk.n) + +class BaseSoC(SDRAMSoC): + default_platform = "pipistrello" + + csr_map = { + "spiflash": 10, + } + csr_map.update(SDRAMSoC.csr_map) + + def __init__(self, platform, **kwargs): + clk_freq = 80*1000*1000 + SDRAMSoC.__init__(self, platform, clk_freq, + cpu_reset_address=0x60000, **kwargs) + + self.submodules.crg = _CRG(platform, clk_freq) + + sdram_geom = sdram.GeomSettings( + bank_a=2, + row_a=12, + col_a=8 + ) + sdram_timing = sdram.TimingSettings( + tRP=self.ns(15), + tRCD=self.ns(15), + tWR=self.ns(15), + tWTR=2, + tREFI=self.ns(64*1000*1000/4096, False), + tRFC=self.ns(72), + req_queue_size=8, + read_time=32, + write_time=16 + ) + self.submodules.sdrphy = gensdrphy.GENSDRPHY(platform.request("sdram")) + self.register_sdram_phy(self.sdrphy.dfi, self.sdrphy.phy_settings, sdram_geom, sdram_timing) + + # BIOS is in SPI flash + self.submodules.spiflash = spiflash.SpiFlash(platform.request("spiflash2x"), dummy=4, div=6) + self.flash_boot_address = 0x70000 + self.register_rom(self.spiflash.bus) + +default_subtarget = BaseSoC