Technical data

Source Transition Time Tests 6
U7232A DisplayPort Compliance Testing Notes 55
Source Transition Time Differential Tests
Transition time testing measures the rise time and fall time across the
outputs of a differential data lane. The transition is defined as the time
interval between the normalized 20% and 80% amplitude levels.
The transition time test should be performed at all bit rates supported
without pre- emphasis for 400 mV differential voltage swing. The source
pattern should be a PRBS7 waveform. This applies to one, two, and four
lane operation with all functional lanes being tested. (Reference: Table 3.10
VESA DisplayPort Standard)
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.