External Memory Interface Handbook Volume 2: Design Guidelines

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

2.6.1. Importance of Accurate Channel Signal Integrity Information

Default values for channel loss (or eye reductoin) can be used when calculating timing margins, however those default values may not accurately reflect the channel loss in your system. If the channel loss in your system is different than the default values, the calculated timing margins will vary accordingly.

If your actual channel loss is greater than the default channel loss, and if you rely on default values, the available timing margins for the entire system will be lower than the values calculated during compilation. By relying on default values that do not accurately reflect your system, you may be lead to believe that you have good timing margin, while in reality, your design may require changes to achieve good channel signal integrity.

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