18.104.22.168. Importance of Accurate Channel Signal Integrity Information
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 are 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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