I'm pretty new at this FPGA design stuff... I need to replace the XC4003E (obsolete) with a newer Xilinx FPGA which performs exactly the same function. I'm unsure which FPGA would suit this purpose. I currently have the schematic and xnf file. At this point I am trying to go the route of designing an interposer. My issues are that I'm trying to find the best match of an available Xilinx part (not in the obsolesence loop) that has the same functionality, but also one that I can interface the 5V that is already designed into the current circuit. Are there any recommendations of current lines of componets that could be a potential replacement for the XC4003E?