Description
The pinout file created by the Quartus® II software versions 9.0 and 9.0 SP1 incorrectly identifies the RREF pins as GND pins in Arria® II GX devices. The RREF pins connect to GND on the PCB but through precision 2-kohm resistors as specified in the Arria II GX Device Family Pin Connection Guidelines (PDF).
This problem is fixed beginning with the Quartus II software version 9.0 SP2.