The differential input buffer (IBUFDSE3) primitive is only supported in HP I/O banks ( This Figure ). This UltraScale architecture specific primitive has functions similar to the IBUFDS_IBUFDISABLE along with controls for offset calibration and input buffer disable (IBUFDISABLE). The offset calibration feature is accessed using the OSC_EN[1:0] and OSC[3:0] ports. The V REF scan feature is not supported with this primitive.