DisplayPort and Embedded DisplayPort Tuning Guide
PRELIMINARY INFORMATION
Jetson AGX Orin Series Tuning and Compliance Guide
DA-11040-001_v0.7 | 39
describe the major controls to tune for characterization. Tuning consists of adjusting the
settings to meet each voltage swing, pre-emphasis, and maximum differential voltage test for
each driver configuration.
Drive Strength
Drive strength controls the amount of drive current of each of the four lanes and can be
configured individually, affecting the overall voltage swing. This control has higher priority over
pre-emphasis. Meaning if the settings are maxed out, there will be no current drivers for the
other controls.
To save power, this setting can be reduced until it can pass with sufficient margin, roughly 20
to 30%.
Pre-Emphasis
Pre-emphasis controls affect the voltage swing of the transition bit. There must be distinct
levels of pre-emphasis to meet specifications. Increasing pre-emphasis also affects non-
transition bits, effectively lowering the voltage swing of the non-transition bits.
To save power, this setting can be reduced until it can pass with sufficient margin; roughly 20-
30%.
Post Cursor2
Post Cursor2 is deprecated and should always be set to 0.
Procedures
Before proceeding with the tuning procedure, the scope and probes must be calibrated. Refer
to your vendor-specific scope and probe user manuals for details on how to calibrate. The
following procedure uses the Unigraf DPR-100 AUX controller for automation.
DUT
Configure the DUT to output the appropriate output configuration, such as bit rate, swing
levels, and test patterns. Then connect the test fixture to the DUT and the test fixture to probes
to the scope. Any untested lanes should be terminated with 50 Ω to GND.
Oscilloscope and AUX Channel Controller
After calibration, initialize the compliance test software and configure it for all the modes
supported by the DUT. Set up the compliance test software to run automation by choosing
