Stratix V Device Handbook: Volume 2: Transceivers

ID 683779
Date 11/23/2021
Document Table of Contents

6.6. Adaptive Equalization

Adaptive equalization (AEQ) solves issues related to changing data rates and backplane losses.

High-speed interface systems require different equalization settings to compensate for changing data rates and backplane losses. Manual tuning of the receiver channel equalization stages involves finding the optimal settings through trial and error, and then locking in those values during compilation. This manual static method is cumbersome and inefficient when system characteristics vary. The AEQ automatically tunes an active receiver channel equalization filter based on a frequency content comparison between the incoming signals and the internally generated reference signals.

In Stratix V GT devices, the GT channels do not support AEQ. This feature is supported in the GX channels.

The Transceiver Reconfiguration Controller provides an Avalon-MM user interface to enable the AEQ feature.