forked from M-Labs/artiq
drtio/gth_ultrascale: disable IBUFDS_GTE3 until stable_clkin
Precaution against HMC7043 noise issues.
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@ -637,8 +637,9 @@ class GTH(Module, TransceiverInterface):
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# # #
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refclk = Signal()
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ibufds_ceb = Signal()
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self.specials += Instance("IBUFDS_GTE3",
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i_CEB=0,
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i_CEB=ibufds_ceb,
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i_I=clock_pads.p,
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i_IB=clock_pads.n,
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o_O=refclk)
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@ -664,8 +665,10 @@ class GTH(Module, TransceiverInterface):
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self.submodules.tx_phase_alignment = GTHTXPhaseAlignement(self.gths)
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TransceiverInterface.__init__(self, channel_interfaces)
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# GTH PLLs recover on their own from an interrupted clock input.
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# stable_clkin can be ignored.
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# GTH PLLs recover on their own from an interrupted clock input,
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# but be paranoid about HMC7043 noise.
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self.stable_clkin.storage.attr.add("no_retiming")
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self.comb += ibufds_ceb.eq(~self.stable_clkin.storage)
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self.comb += [
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self.cd_rtio.clk.eq(self.gths[master].cd_rtio_tx.clk),
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