20.3.9 Vectorless Estimation

The Vectorless estimation method is an accurate method of annotating individual pins with frequencies and probabilities. It uses primary inputs, clock frequencies, and nets annotated with other methods as a starting point, and uses a Monte Carlo simulation to annotate all nets in the design with frequencies and probabilities.

Vectorless estimation is available and enabled by default for IGLOO®, ProASIC3, SmartFusion®, and Fusion® families of devices.

Vectorless estimation can be enabled from the Initialize Frequencies and Probabilities dialog box or from the VCD Import dialog box.

Changes to probabilities or frequencies in the Probabilities, Frequencies, or Domains tabs result in an out-of-date vectorless estimation. To update vectorless estimation, press the refresh vectorless button.