DP AUX (DisplayPort Auxiliary channel)

The DP AUX Channel is to detect the link, configuration, and status of the Display Port source. The Display Port is the digital display interface that is specified in the VESA standard.

Acute Technology provides logic analyzers with DP AUX decoding capabilities, including detailed DPCD bit analysis, significantly reducing debugging time.

The TravelBus series supports direct measurement of differential signals, such as DP AUX, while other series require a DP AUX adaptor to convert differential signals into single-ended signals.

Logic Analyzer

TB3016B

TB3000 series Specifications PDF

MSO2116E (w/ analog channels)

MSO2000 series Specifications PDF

DP AUX Decode / Waveforms (Digital + Analog):

Multiple Protocols (I2C + DP AUX) Decode / Waveforms

Save as TXT/CSV

In Logic Analyzer mode, click the icon above the report area to save the decoded data as a TXT/CSV file.

DP AUX Decoding Setup Steps

1. Click Quick Settings or Add Protocol Decode to select a protocol for logic analyzer capture.

2. Select DP_AuxCH for decoding.

3. If you use Quick Settings, the system will recommend configurations for trigger type, sampling rate, voltage threshold, and channel settings.

4. Click the icon to access the Decode Settings screen.

Decode Settings

Channel: Set the channel to decode

Show DPCD: Show the Display Port Configuration data.

Mode: Choose the mode DP_Aux/HPD/PWR

Startup transaction: Set the transaction type of the first frame

Reply Timeout: Set the value of timeout

Protocol Analyzer DP AUX Decode

Save as TXT/CSV

In Protocol Analyzer mode, click the icon above the report area to save the decoded data as a TXT/CSV file.

TravelBus Series Logic Analyzer

Use a USB Type-C adaptor to extract the DP AUX differential signals, then measure them directly with the TB3016B.

TB3016B pins

USB Type-C fixture

MSO2000 Series Logic Analyzer

Use a USB Type-C adaptor to extract the DP AUX differential signals, convert them to single-ended signals using a DP AUX adaptor, and then measure them with the MSO2000 series logic analyzer.

DP AUX Differential Signal Adaptor

Cascade multiple DP AUX adapters:

YouTube Video

DP AUX Decoding Examples