Intel® Agilex™ General-Purpose I/O and LVDS SERDES User Guide

ID 683780
Date 10/29/2021

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5.1.6. Special Pins Requirement

RZQ Pins

There are two RZQ pins per I/O bank. To use the RZQ pins for OCT calibration, connect a precision resistor with a ±1% tolerance to the pins. The RZQ pins are dual-purpose pins, and can be used as GPIO when OCT calibration is not used.


A VREF voltage is required for all voltage referenced I/O standards. Intel® Agilex™ GPIO banks support internal and external VREF types. The external VREF pin is a dedicated pin that cannot be used as a GPIO pin. You must tie the pin to ground when it is not used. Each I/O lane must share the same VREF type (internal or external VREF ), and when external VREF is used, it must share the identical VREF voltage.

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