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

ID 683780
Date 10/29/2021

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2.2.9. Schmitt Trigger Input Buffer

Intel® Agilex™ devices feature selectable Schmitt Trigger input buffer on the HPS I/O bank.

The Schmitt Trigger allows input buffers to respond to slow input edge rates with a fast output edge rate. Most importantly, Schmitt Triggers provide hysteresis on the input buffer, preventing slow-rising noisy input signals from ringing or oscillating on the input signal driven into the logic array.

This feature provides system noise tolerance on Intel® Agilex™ inputs, but adds a small, nominal input delay.