Overview & Features

Debug DisplayPort 1.4 & eDP AUX transactions in Real-Time


  • Get detailed insight into DisplayPort AUX transactions.
  • Correlate between DisplayPort AUX Physical layer and Protocol Layer.
  • Easily interpret AUX traffic register values and timings.


The DisplayPort Auxiliary (AUX) channel is a bi-directional, half-duplex channel that carries device management
and control data for the DisplayPort main link, such as VESA EDID, MCCS, and DPMS standards. An oscilloscope
with GRL-DP-AUX-DEC DisplayPort AUX protocol decode software connected between the Source and Sink device
captures DisplayPort AUX traffic and timings. All AUX transactions – like DPCD reads and writes, and EDID reads –
can be clearly viewed and analyzed, along with the physical layer signal captures.

GRL-DP-AUX-DEC analyzes all native DisplayPort and I2C traffic and displays the complete associated register
details. The ability to analyze these detailed transactions between Source and Sink plays a major role in quickly
debugging DisplayPort and eDP interoperability problems.

Key Features

Features – Available Now

  • Conformance to DisplayPort 1.4 Specification and Embedded DisplayPort (eDP) version 1.4 .
  • Displays native and I2C over AUX channel transactions with complete packet details in tabular format.
  • Decodes live and stored waveforms.
  • Seamlessly links physical layer signals to DP AUX protocol transactions.
  • Expands commands in accordance to the DP specification and displays all associated registers and data.
  • Displays physical layer waveform along with the bus diagram.
  • Detailed micro packet descriptions.
  • Time-stamped AUX protocol details helps identify timing issues within your design.
  • Automated PDF report generation.