External Memory Interface Handbook Volume 2: Design Guidelines: For UniPHY-based Device Families

ID 683385
Date 3/06/2023
Document Table of Contents
Give Feedback Additional Guidelines for Cyclone V Devices

This topic provides guidelines for improving performance for Cyclone V devices.

I/O Pins Connect to Ground for Hard Memory Interface Operation

According to the Cyclone V pin-out file, there are some general I/O pins that are connected to ground for hard memory interface operation. These I/O pins should be grounded to reduce crosstalk from neighboring I/O pins and to ensure the performance of the hard memory interface.

The grounded user I/O pins can also be used as regular I/O pins if you run short of available I/O pins; however, the hard memory interface performance will be reduced if these pins are not connected to ground.