5 Configuration of Measuring AUX CH With DS90LV047-48AEVM and Logic Analyzer

Figure 5-1 shows the hardware configuration to measure AUX transactions. This setup includes the DS90LV048A-EVM and a logic analyzer to capture the waveforms.

Figure 5-1 Diagram for Measuring AUX Transaction Using DS90LV048A-EVM

The measured waveform using an oscilloscope is shown in Figure 5-2. Oscilloscopes are unable to provide a long-time measurement, and also have difficulties accurately capturing the waveforms.

Figure 5-2 AUX Waveform by Oscilloscope

Figure 5-3 shows the measurement from a logic analyzer. The logic analyzer capture shows better visibility for long time measurements, which provides more efficiency when analyzing the AUX transactions.

Figure 5-3 AUX Waveform by Logic Analyzer

Figure 5-4 shows the logic analyzer capture with a plug-in extension to interpret and display AUX transactions above the waveforms. This helps with understanding the DisplayPort source and Sink behavior and AUX transactions quickly, particularly the link training period.

Figure 5-4 AUX Waveform by Logic Analyzer With Extension