Technical data

Source Intra-Pair Skew Tests 12
U7232A DisplayPort Compliance Testing Notes 115
Intra-Pair Skew Test
The intra- pair skew test evaluates the skew, or time delay, between
respective sides of a differential data lane in a DisplayPort interface.
(Reference Table 3.10 VESA DisplayPort Standard)
Intra- pair skew has deleterious effects on signal rise time and manner of
crossing through the transition point. The DisplayPort specification at
package pins (TP1) is 20 ps. It can clearly double or triple to and through
the connector. These are secondary contributors to source jitter
performance.
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.