188.8.131.52. OCT Calibration
Stratix V GX and GS devices contain calibration circuits that calibrate the OCT resistors and analog portions of the transceiver blocks to ensure that the functionality is independent of process, voltage, and temperature (PVT) variation. GT devices do not have calibration support.
The calibration block internally generates a constant reference voltage, independent of PVT variation. The calibration block uses the internal reference voltage and external reference resistor to generate constant reference currents.
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