2.5.3. OCT Calibration Block Requirement
In the Intel® Quartus® Prime Settings File (.qsf), specify the following RZQ grouping assignment to assign an RZQ pin to an I/O pin:
set_instance_assignment -name RZQ_GROUP oct_rzq_in -to output_pin
The Fitter groups all the pins that are assigned to the same RZQ pin and create an OCT block to calibrate the I/O pins.
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