Rate Change Notes

Versal Adaptive SoC GTY and GTYP Transceivers Architecture Manual (AM002)

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1.3 English

In a design generated through the Wizard containing multiple rates, if the device registers were manually modified by the user, this might cause unexpected behaviors. If a register manually set by the user is part of the rate change sequence, its value will be overwritten during the rate change procedure.

The rate change algorithm does not keep a record of the original device state before any manual register overwrites. This means that if the user modifies a register that is not part of the rate change sequence, it will not be refreshed back to its default state even after each rate change procedure. This could lead to a situation where the register that was manually modified by the user might not be the most optimal and could cause performance issues in the new line rate configuration. Therefore, it is up to the user to track all manually modified register values before and after each rate change and correct them if necessary following the recommendations in this manual.