migration Definition
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."