20.3.7 Specifying Individual Pin Frequencies

The Frequencies tab enables you to specify an average clock and data frequency for each clock domain, and also an average frequency for each set of pins. This gives you an initial estimate of the power consumption of your design. However, if this estimate is not accurate enough, you may refine it with a pin-by-pin annotation of the frequency.

To specify a frequency annotation for an individual pin:

Locate the pin in the Frequencies tab. You may need to select different clock domains from the drop-down list on the Frequencies tab. You can use filters to facilitate this search.
Select the pin(s) in the grid and click the Set frequencies for selected pins button, enter a new frequency value, and click OK. This specifies a new frequency for the selected pin(s).

This annotation procedure enables you to set the frequency of an individual pin, but this does not mean that the pin is removed from its clock domain. A frequency annotation just overrides the domain level frequency.

You may wish to change or remove a frequency annotation of an individual pin. This may be useful when you import a VCD (value change-dump) file or a SAIF (Switching Activity Interchange Format) file.

To change the frequency annotation of an individual pin:

Locate the pin in the Frequencies tab. You may need to select different clock domains from the drop-down list on the Frequencies tab. You can use filters to facilitate the search.
Select the pin(s) in the grid and click the Set frequency for selected pins button, enter a new frequency value, and click OK. This specifies a new frequency for the selected pin(s).

To remove the frequency annotation of an individual pin:

Locate the pin in the Frequencies tab. You may need to select different clock domains from the drop-down menu on the Frequencies tab. You can use filters to facilitate the search.
Select the pin(s) in the grid and click the Reset frequencies for selected pins button. This removes the specified frequency from the selected pins.