import os import sys from distutils.version import StrictVersion from migen.fhdl.std import * from migen.fhdl.specials import SynthesisDirective from migen.genlib.cdc import * from migen.genlib.resetsync import AsyncResetSynchronizer from migen.genlib.io import * from mibuild import tools def settings(path, ver=None, sub=None): vers = list(tools.versions(path)) if ver is None: ver = max(vers) else: ver = StrictVersion(ver) assert ver in vers full = os.path.join(path, str(ver)) if sub: full = os.path.join(full, sub) search = [64, 32] if tools.arch_bits() == 32: search.reverse() if sys.platform == "win32" or sys.platform == "cygwin": script_ext = "bat" else: script_ext = "sh" for b in search: settings = os.path.join(full, "settings{0}.{1}".format(b, script_ext)) if os.path.exists(settings): return settings raise OSError("no settings file found") class XilinxNoRetimingImpl(Module): def __init__(self, reg): self.specials += SynthesisDirective("attribute register_balancing of {r} is no", r=reg) class XilinxNoRetiming: @staticmethod def lower(dr): return XilinxNoRetimingImpl(dr.reg) class XilinxMultiRegImpl(MultiRegImpl): def __init__(self, *args, **kwargs): MultiRegImpl.__init__(self, *args, **kwargs) self.specials += [SynthesisDirective("attribute shreg_extract of {r} is no", r=r) for r in self.regs] class XilinxMultiReg: @staticmethod def lower(dr): return XilinxMultiRegImpl(dr.i, dr.o, dr.odomain, dr.n) class XilinxAsyncResetSynchronizerImpl(Module): def __init__(self, cd, async_reset): rst1 = Signal() self.specials += [ Instance("FDPE", p_INIT=1, i_D=0, i_PRE=async_reset, i_CE=1, i_C=cd.clk, o_Q=rst1), Instance("FDPE", p_INIT=1, i_D=rst1, i_PRE=async_reset, i_CE=1, i_C=cd.clk, o_Q=cd.rst) ] class XilinxAsyncResetSynchronizer: @staticmethod def lower(dr): return XilinxAsyncResetSynchronizerImpl(dr.cd, dr.async_reset) class XilinxDifferentialInputImpl(Module): def __init__(self, i_p, i_n, o): self.specials += Instance("IBUFDS", i_I=i_p, i_IB=i_n, o_O=o) class XilinxDifferentialInput: @staticmethod def lower(dr): return XilinxDifferentialInputImpl(dr.i_p, dr.i_n, dr.o) class XilinxDifferentialOutputImpl(Module): def __init__(self, i, o_p, o_n): self.specials += Instance("OBUFDS", i_I=i, o_O=o_p, o_OB=o_n) class XilinxDifferentialOutput: @staticmethod def lower(dr): return XilinxDifferentialOutputImpl(dr.i, dr.o_p, dr.o_n) class XilinxDDROutputImpl(Module): def __init__(self, i1, i2, o, clk): self.specials += Instance("ODDR", p_DDR_CLK_EDGE="SAME_EDGE", i_C=clk, i_CE=1, i_S=0, i_R=0, i_D1=i1, i_D2=i2, o_Q=o, ) class XilinxDDROutput: @staticmethod def lower(dr): return XilinxDDROutputImpl(dr.i1, dr.i2, dr.o, dr.clk) xilinx_special_overrides = { NoRetiming: XilinxNoRetiming, MultiReg: XilinxMultiReg, AsyncResetSynchronizer: XilinxAsyncResetSynchronizer, DifferentialInput: XilinxDifferentialInput, DifferentialOutput: XilinxDifferentialOutput, DDROutput: XilinxDDROutput }