Can I migrate my Cyclone FPGA or Cyclone II FPGA designs to a Cyclone III FPGA?
No, Cyclone III FPGAs are not pin-compatible with Cyclone II or Cyclone FPGAs. The primary design goal for the Cyclone III device family was to provide an unprecedented combination of low power, high functionality, and low cost. Pin compatibility within the Cyclone series would not allow the architecture to be optimized for the Cyclone III device family.