SelectI/O is Xilinx's proprietary term. It can support many voltage threshold levels that interface with external devices. Currently Virtex-II supports 19 different I/O standards.
CPLD CoolRunner -II Family 9K Gates 384 Macro Cells 217MHz 0.18um Technology 1.8V 144-Pin TQFP EP
CPLD CoolRunner -II Family 12K Gates 512 Macro Cells 128MHz 0.18um Technology 1.8V 324-Pin FBGA
FPGA XC4000E Family 28K Gates 2432 Cells 0.35um Technology 5V 352-Pin Metal BGA
FPGA Spartan-3 Family 50K Gates 1728 Cells 725MHz 90nm Technology 1.2V 208-Pin PQFP
FPGA Spartan-3A Family 50K Gates 1584 Cells 667MHz 90nm Technology 1.2V 256-Pin FTBGA
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