The differential bidirectional input/output buffer primitive (IOBUFDSE3) is only supported in HP I/O banks. This UltraScale architecture specific primitive has functions similar to the IOBUFDS_DCIEN along with controls for offset calibration with input buffer disable control (IBUFDISABLE) and on-die input termination disable control (DCITERMDISABLE) for the input buffer. The offset calibration feature is accessed using the OSC_EN[1:0] and OSC[3:0] ports. The VREF scan feature is not supported with this primitive.
X-Ref Target - Figure 1-40