The bidirectional input/output buffer primitive (IOBUFE3) is only supported in HP I/O banks ( This Figure ). This UltraScale architecture specific primitive has functions similar to the IOBUF_DCIEN along with controls for offset calibration and V REF tuning with input buffer disable (IBUFDISABLE) and on-die input termination control (DCITERMDISABLE) for the input buffer. The offset calibration feature is accessed using the OSC_EN and OSC[3:0] ports. The V REF scan feature is accessed using the HPIO_VREF primitive in conjunction with IOBUFE3.
