Enables triggering on packet level content for Low-speed and Full-speed USB serial buses. Also enables analytical tools such as digital views of the signal, bus views, packet decoding, search tools, and packet decode tables with time stamp information for Low-speed, Full-speed, and High-speed USB serial buses. Probing Low Speed, Full Speed: Single ended or differential; High Speed: Differential. USB High Speed supported only on 1 GHz models. 1 GHz bandwidth models are required for high-speed (HS) USB serial triggering and analysis.