Technical data

Source Rise And Fall Time Mismatch Tests 11
U7232A DisplayPort Compliance Testing Notes 105
Source Rise And Fall Time Mismatch Tests
The rise and fall time mismatch tests evaluate the difference in rise and
fall times of the two single- ended waveform in a given differential data
lane of a DisplayPort interface. (Reference Table 3.10 VESA DisplayPort
Standard specification.)
The mismatch in time of the rising and falling time of the single- ended
signals composing a differential lane will create common mode noise and
will radiate.
The rise and fall times are measured between the 80% and 20% levels of
the waveform.
Test P ro ce du re
1 Start the automated testing application as described in “Starting the
DisplayPort Electrical Performance Compliance Test Application" on
page 18.
2 Connect the W2641A test fixture to the device under test (DUT).
3 If you are using one connection, connect the probe to any channel. If
you are using two connections, connect the two probes to any two
channels of the oscilloscope. If you are using four connections, connect
the four probes to any four channels of the oscilloscope.
4 Connect the SMA to SMP cable to the SMA probe head of one of the
probes and to the data lane connector on the W2641A fixture that you
want to test.
5 Connect the other SMA to SMP cable to the other SMA probe head and
to the data lane on the W2641A test fixture that you want to test.
6 In the DisplayPort Compliance Test Application, click the Set Up tab.
7 Set the DUT Definition Driven Setting, the Test Type, the Fixture Type,
Lane- Channel Selection, Connection Settings, and the Connection Type
according to the type of testing being done.