Xilinx XC3S500E

From Open Circuits

Xilinx XC3S500E is logic optimized FPGA.
Xilinx XC3S500E pins
Xilinx XC3S500E pin description
Xilinx Spartan-3E Datasheet

Default I/O standard for configuration: LVCMOS25
By setting VCCO_2 to another value, one can use 1,8V or 3,3V operation aswell.