Support Question of the Week: Beagle USB Protocol Analyzer Support for Full Speed LPM Transactions

Q:  We would like to use a USB protocol analyzer for monitoring Link Power Management (LPM) transactions at Full Speed only - not High Speed or Super Speed. Which USB protocol analyzer models do you recommend?

Thanks for your question! For your application, many Total Phase USB protocol analyzers can monitor LPM transactions at full speed (12 Mbps).

Beagle 480 Power Protocol Analyzer for Power Measurement and Monitoring Capabilities Figure 1: Beagle 480 Power Protocol Analyzer

Following is a summary of USB models and their attributes:

For USB 2.0:

  • The Beagle USB 12 Protocol Analyzer is a non-intrusive monitor for Full/Low-speed USB (1.5 Mbps/12 Mbps). The Beagle USB 12 analyzer has real-time USB descriptor parsing, and real-time data capture and display. The Beagle USB 12 analyzer can also watch USB packets as they occur on the bus.
  • The Beagle USB 480 Protocol Analyzer is a non-intrusive monitor for High-speed, Full-speed, and Low-Speed USB 2.0 (480 Mbps / 12 Mbps / 1.5 Mbps) and a more robust and faster device. The Beagle USB 480 analyzer has real-time USB class-level decoding with the Data Center Software, two capture modes: real-time and delayed-download, high-speed USB chirp detection, robust automatic speed detection, hardware-based packet suppression, and digital inputs and outputs for synchronizing with external logic. The Beagle USB 480 analyzer can also detect suspend/resume events and unexpected signals.  We also have two models of the Beagle USB 480 analyzer for measuring current and voltage: Beagle USB 480 Power Protocol Analyzer Standard Edition and Beagle USB 480 Power Protocol Analyzer Ultimate Edition.
Beagle USB Protocol Analyzers support LPM transactions at various speeds Figure 2: Beagle USB 5000 Protocol Analyzer

For USB 2.0 and USB 3.0:

  • The Beagle USB 5000 v2 SuperSpeed Ultimate Protocol Analyzer is a non-intrusive monitor for USB 3.0 (Super Speed 5 Gbps) and USB 2.0 (High-speed 480 Mbps, Full-speed 12 Mbps, and Low-Speed 1.5 Mbps) and a more robust and faster device. This Beagle analyzer also monitors USB 3.0 and USB 2.0 simultaneously, and enable advanced sync to monitor applications requiring multiple analyzers. This model also has 4 GB on-board buffer with live data streaming to the analysis computer; real-time USB class-level decoding with the Data Center Software; precise timing down to 2 ns resolution; match/action trigger and filter system; USB 3.0 downlink enables longer captures; automatic support for data scrambling, spread spectrum clocking, polarity inversion, and receiver detection; and multiple digital inputs and outputs for synchronizing with external devices. In addition, if ultimate capability is not required, the Beagle USB 5000 standard model can be configured - ask our sales team.

For more information about Total Phase USB protocol analyzers and related products, please refer to the following:

Protocol Analyzers
USB Products
Beagle Protocol Analyzer User Manual
Total Phase Products
Product Selector Guide

We hope this answers your question. If you have other questions about our USB protocol analyzers or other Total Phase products, feel free to email us at sales@totalphase.com or support@totalphase.com.

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