This is my understanding too. Is it possible to use an fpga without built in diff pairs and serdes, and use the io's that are built with a suitable high speed c

This is my understanding too. Is it possible to use an fpga without built in diff pairs and serdes, and use the io's that are built with a suitable high speed clock domain for a "diy" differential pair? Maybe not as fast, but still faster than any other io on the fpga?