Power Analyzer Confidence Metric Report

Reports the signal data sources and associated signal types the Power Analyzer uses when performing the power analysis. The following are possible data sources, listed in descending order of accuracy:

  • User-entered assignment shows a node, entity, or clock assignment you assigned.
  • Simulation data shows data in the form of a Signal Activity File (.saf) Definition or Value Change Dump File (.vcd) Definition file, generated by the Quartus® Prime Simulator or third-party simulator.
  • User-specified input I/O default toggle rate shows the input I/O default toggle rate specified by the user on the Power Analyzer Settings page for input I/O, bidirectional, and virtual signals.
  • Vectorless estimation shows signal activities derived by the Power Analyzer using probabilistic methods.
  • Design-wide default values shows the default toggle rate you specified on the Power Analyzer Settings page for non-I/O, bidirectional, and virtual signals
  • Assumed 0 shows instances where the user specified a default toggle rate as a percentage of the relevant clock rate. The Power Analyzer may occasionally be unable to identify the correct clock domain for the signal. A message is displayed because the toggle rate for the associated node is assumed to be zero.

The report lists the number of each of the above data sources used for each type of signal (pin, registered, and combinational), for both toggle rate and static probability data.

For data generated by a simulator (Signal Activity File (.saf) and Value Change Dump File (.vcd)), the summary also lists the percentage of nodes that toggled during the simulation, and the average percentage of time that nodes were in an unknown simulation state (a high-quality simulation is characterized by a high percentage of nodes in an unknown state for a lower percentage of simulation time).