Leveraging In-System ECO Capability of Virtex-4 EasyPath FPGAs Application Note (XAPP803) - Even after volume shipments have begun, customers can take advantage of the In-System Engineering Change Orders (ECO) capability in Virtex-4 EasyPath FPGAs to make changes to LUTs and I/Os. This application note describes how to make these changes in a simple way using the FPGA Editor tool.