Virtex-6 FPGA GTX收发 User Guide:This document shows how to use the GTX transceivers in Virtex®-6 FPGAs. In this document: • Virtex-6 FPGA GTX transceiver is abbreviated as GTX transceiver. • GTXE1 is the name of the instantiation primitive that instantiates one Virtex-6 FPGA GTX transceiver. • A Quad or Q is a cluster or set of four GTX transceivers that share two differential reference clock pin pairs and analog supply pins.