The updated information from DE2_V2.1 to the DE2_V2.2 is as below:
1. The power source of the 5v & 3.3V power to the USB Blaster circuit have been changed to be supplied by the on-board 5V & 3.3V power.
2. The component of 5V & 3.3V power which is generated by USB 5V have been changed to DNI.
3. Replaced  the Flash chip to S29GL032N90TFI040
4. Replaced TV decoder chip to ADV7180
5. Changed 1-bit mode SD card to 4-bit mode