This Answer Record deals with SelectIO performance and aims to increase understanding of Xilinx I/O performance.
It has two sections:
Understanding Performance Specifications:
There are 3 types of I/O standard available on Xilinx FPGA's.
These are Single-ended, Differential and Pseudo-Differential.
Factors Affecting I/O Performance:
I/O performance is affected by a number of factors. For more information, see (Xilinx Answer 50197)