42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
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from migen import *
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class IOLoopBack(Module):
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def __init__(self, pads):
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self.o = Signal(4)
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self.i = Signal(4)
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self.t = Signal(4)
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for i in range(4):
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self.specials += Instance("IOBUFDS",
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o_O=self.o[i],
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io_IO=pads[i].p,
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io_IOB=pads[i].n,
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i_I=self.i[i],
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# Always enable input buffer, so it is actually a loop back
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i_T=self.t[i],
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)
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class SingleIOLoopback(Module):
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def __init__(self, pad):
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self.o = Signal()
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self.i = Signal()
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self.t = Signal()
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self.specials += Instance(
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# "IOBUFDS_DCIEN",
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"IOBUFDS",
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# p_DIFF_TERM="TRUE",
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# p_IBUF_LOW_PWR="TRUE",
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# p_USE_IBUFDISABLE="TRUE",
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o_O=self.o,
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io_IO=pad.p,
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io_IOB=pad.n,
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i_I=self.i,
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# Always enable input buffer, so it is actually a loop back
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i_T=self.t,
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# i_IBUFDISABLE=~self.t,
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# i_DCITERMDISABLE=~self.t,
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)
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