DP 1.2 Link CTS Testing

DPR-120 as Authorized Test Tool

Unigraf's DPR-120 DisplayPort Reference Sink is an Authorized Test Tool for DP 1.2 Link Core and Link Ext1 CTS tests for testing DisplayPort source devices. DPR-120 Debug and Test Controller SW (DTC) is the graphical user interface (GUI) for controlling the DP 1.2 Link CTS tests with DPR-120 Reference Sink. DPR-120 DTC also has many powerful debug features for monitoring the status of the tested unit (DUT) and the test procedure.

Compliance Test Sets

DPR-120 DTC executes the DP Link compliance tests as defined in 
VESA® DisplayPort® Link Layer Compliance Test Specification. The tests are divided into sets based on their scope. Please find below a description of each set.

Test Set A

  • DP 1.2 Link Ext1 tests for basic link training functions, HBR2 extension.
      (Tests 400.3.1.1 to 400.3.1.9)
  • Additional DPCD handling tests.
      (Tests 700.1.1.1, 700.1.1.2) 

Test Set B

  • DP 1.2 Link Ext1 tests for link configuration changes, HBR2 extension.
      (Tests 400.3.1.12 to 400.3.1.15;
       400.3.2.1 to 400.3.2.3)
  • Video stamp generation
    (Test 400.3.3.1)

Test Set C

  • Partial set of tests from DP 1.2 CTS Core not covered by Ext1.
      (Tests,; to; to; to;
       4.4.2, 4.4.3)

Test Set D
Test Set D

  • Lane Count Reduction Tests
       (Tests from "Reduced lane count link training Test Proposal")

Recording AUX Traffic

For documenting the execution of the compliance test procedure it is often necessary to record also the AUX traffic between the DUT source and the reference sink. A practical solution for that is the DPR-120 MST Debug Extension that includes a built-in AUX Channel Monitor for recording the AUX communication in the upstream link.

MST Debug Extension

  • Record AUX Traffic in the upstream link
  • View time stamped logs as matrix
  • View transaction details in parsed format
  • Store and retrieve AUX Logs in a file
  • Store AUX Logs as a HTML report

Test Automation

DPR-120 Test Automation Shell enables execution of the CTS tests and debug functions as predefined test scripts. For preparation of the automated tests and for analyzing the results, e.g. configuration files can be created with DPR-120 DTC GUI and recalled in TA Shell.

DPR-120 TA Shell

  • Enables automated execution of CTS tests
  • Enables automated execution of DPR-120 DTC test routines

What is needed for Compliance?

The image below explains the relation and use of the three SW sets and what is needed for each certification test.

DPR-120 SW Options

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