Keysight N5990A-155, User Manual

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80 Keysight N5990A-155 DisplayPort User Guide
5 Sink Calibration Procedures
For Sink Test Procedures, the basic approach is always the same:
• Achieve frequency lock
• Achieve symbol lock
• Configure the DUT for error counting
• Verify the error counting
• Run the BER test
Before starting the Sink tests, it is recommended that you click “Query
DUT Capabilities” in the “Advanced Product Configuration”. Then, the AUX
Controller communicates with the DUT, and the DUT capabilities are
displayed. This ensures that the AUX Controller is able to communicate
with the DP-controller inside the DUT before you start running the tests.
The Sink tests for DisplayPort are implemented according to the section
“Sink Compliance Test” of the DisplayPort 1.4/Type-C CTS.
The Sink test groups are divided according to Lanes (0–3) and further
divided by supported data rates (RBR, HBR, HBR2 and HBR3). There are
three types of tests:
• Jitter Tolerance Tests (at TP3)
• TP2 Tests
• Expert Mode Tests
Table 7 presents a description of the procedure parameters used in
different Sink Rx tests.
Table 7 DisplayPort Receiver Parameters
NOTE
The real-time oscilloscope is not needed for Rx tests.
Parameter name Parameter Description
Bit Error Rate Testing
Link Quality Pattern Hint Represents the link quality pattern that is written to the DPCD register according to the specification. Make sure that
this value is in sync with the Sequence File property.
Observation Time The time interval (in seconds) when the PRBS pattern is sent out.
Allowed Number of Errors Maximum allowed number of errors in order to pass the test.