forked from M-Labs/artiq
51 lines
1.3 KiB
Python
51 lines
1.3 KiB
Python
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from migen.fhdl.std import *
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from migen.genlib.cdc import MultiReg
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from migen.genlib.record import Record
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class PHYBase(Module):
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def __init__(self, fine_ts_bits, pads, output_only_pads):
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self.interface = []
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for pad in pads:
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layout = [
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("o_set_value", 1),
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("o_value", 1)
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]
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if fine_ts_bits:
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layout.append(("o_fine_ts", fine_ts_bits))
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if pad not in output_only_pads:
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layout += [
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("oe", 1),
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("i_detect", 1),
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("i_value", 1)
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]
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if fine_ts_bits:
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layout.append(("i_fine_ts", fine_ts_bits))
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self.interface.append(Record(layout))
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class SimplePHY(PHYBase):
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def __init__(self, pads, output_only_pads=set()):
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PHYBase.__init__(self, 0, pads, output_only_pads)
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for pad, padif in zip(pads, self.interface):
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o_pad_d1 = Signal()
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o_pad = Signal()
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self.sync += [
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If(padif.o_set_value, o_pad_d1.eq(padif.o_value)),
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o_pad.eq(o_pad_d1)
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]
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if pad in output_only_pads:
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self.comb += pad.eq(o_pad)
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else:
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ts = TSTriple()
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i_pad = Signal()
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self.sync += ts.oe.eq(padif.oe)
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self.comb += ts.o.eq(o_pad)
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self.specials += MultiReg(ts.i, i_pad), \
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ts.get_tristate(pad)
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i_pad_d = Signal()
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self.sync += i_pad_d.eq(i_pad)
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self.comb += padif.i_detect.eq(i_pad ^ i_pad_d), \
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padif.i_value.eq(i_pad)
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