Once you have provided Report Power with the relevant input data, run the analysis. The tool starts annotating the netlist with activity from files and user inputs, then apply the tool defaults for the remaining undefined nodes. Next, through an iterative process, the tool propagates this initial activity from the primary inputs to the primary outputs of your design to refine the activity estimate for the undefined nodes. Finally, it calculates the dynamic power for each resource used and deduce the additional static power this switching activity generates, to compute the expected junction temperature and total power requirements for the design.