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N8837A USB-PD Protocol Triggering and Decode for Infiniium Series Oscilloscopes

Data Sheets

Keysight N8837A

USB-PD Protocol Triggering and Decode for Infiniium Series Oscilloscopes

Data Sheet

Easily Debug and Test Designs That Include USB-PD Protocols

Introduction of the USB Type-C connector also introduced the enhanced capabilities of USB-PD. The CC line in the Type-C connector is a single-ended, BMC encoded, 4b/5b signal used for Power Delivery (PD) negotiation. USB-PD is responsible for negotiating power levels, device type, connector orientation, charging infrastructure, and other capabilities like ALT mode.

Serial buses such as the USB-PD CC line are widely used today in electronic designs. In many designs, these serial buses provide content-rich points for debug and test. However, since these protocols transfer bits serially, using a traditional oscilloscope has limitations. Manually converting captured 1’s and 0’s to protocol requires significant effort. In addition, traditional scope triggers are not sufficient for specifying protocol-level conditions.

Now you can extend your oscilloscope’s capability with the N8837A USB-PD protocol triggering and decode application. This application makes it easy to debug and test designs that include USB-PD protocols using your Infiniium oscilloscope.

–Set up your scope to show USB-PD protocol decode in less than 30 seconds.

–Get access to a rich set of integrated protocol-level triggers.

–Save time and eliminate errors by viewing packets at the protocol level.

–Use time-correlated views to quickly troubleshoot serial protocol problems back to their timing or signal integrity root cause.

USB-PD protocol triggering and searching

Get access to a rich set of integrated protocol level triggers. The application includes a suite of configurable protocol-level trigger conditions specific to USB-PD. When serial triggering is selected, the application enables special real-time triggering hardware inside the Infiniium S-Series oscilloscope.

Hardware-based triggering on S-Series oscilloscopes ensures that the scope never misses a trigger event when armed. This hardware takes signals acquired using either scope or digital channels and reconstructs protocol frames. It then inspects these protocol frames against specified protocol-level trigger conditions and triggers when the condition is met.

USB-PD protocol decode

The Keysight Technologies, Inc. USB-PD protocol viewer includes correlation between the waveforms and the selected packet. The selected packet (highlighted blue row in the listing) is time-correlated with the blue vertical line in the waveform display. Move the blue tracking marker in time through waveforms, and the blue bar will automatically track in the packets window. Or you can scroll through the packet viewer and highlight a specific packet. The time-correlation tracking marker will move to the associated point in the waveform.

Fill the entire display with compact protocol information using the full-screen listing. The protocol viewer window shows the index number, time stamp value, and data content for each serial packet in the list. Scroll through all decoded serial packets to find events of interest or errors in the transmission. Data in the listing window can be saved as .csv or .txt file for offline analysis or documentation. Error packets are shown in red to help with debug.

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