from migen.fhdl.std import * from migen.genlib.cdc import MultiReg from artiqlib.rtio.rbus import create_rbus class SimplePHY(Module): def __init__(self, pads, output_only_pads=set()): self.rbus = create_rbus(0, pads, output_only_pads) self.loopback_latency = 3 # # # for pad, chif in zip(pads, self.rbus): o_pad = Signal() self.sync.rio += If(chif.o_stb, o_pad.eq(chif.o_value)) if hasattr(chif, "oe"): ts = TSTriple() i_pad = Signal() self.sync.rio += ts.oe.eq(chif.oe) self.comb += ts.o.eq(o_pad) self.specials += MultiReg(ts.i, i_pad, "rio"), \ ts.get_tristate(pad) i_pad_d = Signal() self.sync.rio += i_pad_d.eq(i_pad) self.comb += chif.i_stb.eq(i_pad ^ i_pad_d), \ chif.i_value.eq(i_pad) else: self.comb += pad.eq(o_pad)