External Memory Interface Handbook Volume 2: Design Guidelines

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ID 683385
Date 5/08/2017
Public
Document Table of Contents

2.8.4. Package Deskew Recommendations for Arria 10 and Stratix 10 Devices4.2.3.3. Package Deskew Recommendations for Arria 10 and Stratix 10 Devices

The following table shows package deskew recommendations for all protocols supported on Arria 10 devices.

As operating frequencies increase, it becomes increasingly critical to perform package deskew. The frequencies listed in the table are the minimum frequencies for which you must perform package deskew.

If you plan to use a listed protocol at the specified frequency or higher, you must perform package deskew. For example, you must perform package deskew if you plan to use dual-rank DDR4 at 800 MHz or above.

Protocol Minimum Frequency (MHz) for Which to Perform Package Deskew
Single Rank Dual Rank Quad Rank
DDR4 933 800 667
DDR3 933 800 667
LPDDR3 667 533 Not required
QDR IV 933 Not applicable Not applicable
RLDRAM 3 933 667 Not applicable
RLDRAM II Not required Not applicable Not applicable
QDR II, II+, II+ Xtreme Not required Not applicable Not applicable

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