126.96.36.199. Offset Cancellation in the Receiver Buffer and Receiver CDR
Process variation can lead to a VCM offset between the p and n signals within the differential buffers. Stratix V devices have an automatic calibration in their receiver buffers to remove this VCM offset.
You must use the reconfiguration controller IP for offset cancellation to take place. Calibration does not occur during transceiver reset, only during device configuration. Any signals that may appear on the receiver pin do not affect calibration because the receiver buffers are disconnected during calibration.
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