GTH and GTY transceivers are designed to support pin migration and have identical differential signal and reference clock bond-out. GTY transceivers offer higher performance than GTH transceivers, and thus have different operating characteristics. For example, GTY transceivers are capable of supporting line rates up to 30.5 Gb/s, while GTH transceivers can support up to 16.375 Gb/s. If moving to/from GTH/GTY transceivers, these differences and any others must be accounted for. Refer to Virtex UltraScale FPGAs Data Sheet: DC and AC Switching Characteristics (DS893) [Ref 2], UltraScale Architecture GTH Transceivers User Guide (UG576) [Ref 6], and UltraScale Architecture GTY Transceivers User Guide (UG578) [Ref 7] to learn more about the capabilities of each type of transceiver.
To determine if a migration path will result in any swapping between GTH and GTY transceivers (or vice versa), refer to the Transceiver Quad Migration table in UltraScale and UltraScale+ FPGAs Packaging and Pinouts Product Specification (UG575) [Ref 9].