Intel® Agilex™ F-Series and I-Series General-Purpose I/O User Guide

ID 683780
Date 6/14/2022

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Give Feedback Single-Ended I/O Standard OCT Termination

Serial (RS) and parallel (RT) OCT provides I/O impedance matching and termination capabilities. OCT maintains signal quality, saves board space, and reduces external component costs.

The OCT calibration circuit uses the impedance of the external resistor that is connected to the RZQ pin as reference. The impedance of the I/O buffer is continuously altered until the target impedance is achieved during OCT calibration. The targeted impedance is achieved when the impedance of I/O buffer reaches a predetermined ratio to the reference resistance.

Table 9.  OCT Schemes Supported in Intel® Agilex™ Devices
Direction OCT Schemes
Output RS OCT with calibration
RS OCT without calibration
Input RT OCT with calibration
Bidirectional Dynamic RS and RT OCT