1. A method for generating coverage data for a switch frequency of hardware description language (HDL) signals, comprising the steps of: providing, by a processor, a HDL hardware description model within a register transfer level; providing, by the processor, a filtering algorithm for signals occurring in the HDL hardware description model; extracting, by the processor, a subset of signals from the HDL hardware description model according to said filtering algorithm in order to get relevant signals; after the subset of signals have been extracted, performing, by the processor, a cycle simulation process on a compiled representation of the HDL hardware description model, including performing a checking routine for the relevant signals in every cycle; and storing, by the processor, switch frequencies of the relevant signals in a data base, wherein the relevant signals are at least one of signals and latches which control power of a device under test.