The process of transferring a design from a supported device(Arria series, Cyclone series, MAX II, MAX V, Stratix IV, and Stratix V) family device to a different device in the same device family. You can transfer a design from the design's target device to a larger or smaller FineLine BGA device or to a larger or smaller device with equivalent pin-outs, while maintaining the same board layout and pin assignments.
You specify migration devices for a device with the Migration Devices dialog box, which is available from the Device dialog box.
Migration is also called "device migration."