The transceiver Transmitter REFCLK Phase Noise specification in the Intel® Stratix® 10 Datasheet refers to the differential phase noise, not the maximum single-ended phase shift.
Device Family: Intel® Stratix® 10
Area: Component, Documentation, HSIO
Last Modified: December 14, 2019
Version Found: v19.3
Bug ID: 14010578500
Document ID: S10-DATASHEET | 2019.12.02 PDF