The Beagle™ USB 12 Protocol Analyzer is a non-intrusive Full/Low-speed USB protocol analyzer that now includes real-time USB descriptor parsing. Developers can monitor what is happening on the USB bus as it happens with 21 ns resolution.
 

True Real-Time Performance

Non-intrusively monitor USB 3.0 and 2.0 and see data as it is captured on the bus. Avoid engineering bottlenecks resulting from the delayed download of captured traffic. Beagle USB 5000 SuperSpeed analyzer users can start debugging as soon as the data appears on the bus.