I'm running LPDDR4 DDRx batch simulation and seeing a monotonic failure for the Differential pair in slow corner .The waveform looks good to me, please see the attached .
The default threshold for monotonicity check is 0.1mV. I feel that is too strict, and almost always change it to 10mV.
You might make it 1 or 2mV if still want to be very conservative. Think about what level you can actually measure and what level would actually have an effect on the receiver.
Thank you Weston !
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