Are the devices real or fake? Are the devices counterfeit? Are the devices still available, XC4000/A/D/HE/L/EX/XL/XLA/XV? What are the recommended replacement parts? How to migrate? What software supports XC4000/E/XL/XV/XLA? How do I access the software for XC4000/A/D/HE/L/EX/XL/XLA/XV? What do the device markings mean? Are the devices Pb-free? Are the devices RoHS compliant? What PROMs can be used with the XC4000/E/XL/XV/XLA?
if you have any questions relating to the XC4000 families hardware including questions on availability, replacements etc, see: (Xilinx Answer 33556).
if you have any questions relating to the XC4000 families software including questions on software versions, bitstream compatibility, see: (Xilinx Answer 33555).