I/O Maximum Toggle Rate logic option

Allows you to specify the frequency at which a pin toggles. This option directs the Fitter to allow a single-ended pin to be placed closer to a differential pin.

This option is useful for analyzing signal integrity under worst-case conditions, that is, the highest possible toggle rate.

This option is ignored if it is applied to anything other than a pin.

This option is available for all Intel devices supported by the Intel® Quartus® Prime software.


To specify the expected time-averaged toggle rate rather than worst-case toggle rate, use the Power Toggle Rate logic option. The Power Toggle Rate logic option is used by the Power Analyzer to estimate time-averaged power consumption. To configure the data rates used for metastability reporting in the Timing Analyzer, use the Synchronizer Toggle Rate logic option.

Scripting Information

Keyword: io_maximum_toggle_rate

Settings: <frequency>