OpenSwitch – RTL Switching Activity & Power Analyzer
An open-source RTL switching activity analysis tool that parses VCD simulation outputs to compute signal toggle rates and provide early-stage dynamic power insights for digital VLSI design.
OpenSwitch is a fully open-source RTL-level switching activity and dynamic power analysis tool designed for digital VLSI designers and students working with open-source HDL flows.
In modern CMOS circuits, dynamic power consumption is directly proportional to switching activity:
P = α · C · V² · f
However, most RTL workflows focus only on functional verification and ignore switching intensity during early design stages. There is currently no lightweight, student-friendly, open-source tool that analyzes VCD (Value Change Dump) files to provide structured switching insights.
OpenSwitch addresses this gap by:
Parsing VCD files generated from Verilog simulations
Counting signal transitions (0→1 and 1→0)
Computing switching factor (α) per net
Ranking high-activity signals
Exporting analysis reports
Optionally estimating relative dynamic power
The tool integrates seamlessly with open-source simulators such as Icarus Verilog and waveform viewers like GTKWave, making it accessible to the open silicon ecosystem.
OpenSwitch aims to introduce early-stage power awareness into RTL design workflows and support low-power digital design learning through open-source tooling.