Quartus® Prime Pro Edition User Guide: Design Recommendations

ID 683082
Date 4/14/2025
Public
Document Table of Contents

3.4.3. Set the Synchronizer Data Toggle Rate

The MTBF calculations assume the data being synchronized is switching at a toggle rate of 12.5% of the source clock frequency.

To help ensure accurate MTBF analysis for reset synchronizers, specify the toggle_rate for all reset synchronizers in your design. If you know an approximate rate at which the data changes, you can specify this with the Synchronizer Toggle Rate logic option assignment in the Assignment Editor.

Note: Starting in Quartus® Prime Pro Edition software version 25.1, the Synchronizer Toggle Rate logic option assignment is now double type (rather than integer), allowing input of decimal values.