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166 Agilent U7232A DisplayPort Electrical Performance Compliance Test Application

19 Sink Total Jitter Tests

Sink Total Jitter Tests

To evaluate the total jitter accompanying the data transmission at either

an explicit bit error rate of 10

-9

or through an approved estimation

technique. This measurement is a data time interval error (Data- TIE) jitter

measurement. (Reference: Table 3.13 VESA DisplayPort Standard).

The overall system jitter budget allocates different amounts of jitter which

each component of the system is allowed to contribute. To exceed any of

these limits is to violate the component level jitter budget. (Reference:

Jitter model in base DisplayPort Specification (Section 3.5.3.9: The Dual

Dirac Jitter Model)).

The test must use a PRBS 7 test pattern at all voltage levels. The test can

be performed with pre- Emphasis for best performance results.

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 22.

2 Connect the W2641A test fixture or other appropriate fixture to the

device under test (DUT).

3 If you are using one connection, connect the probe to one channel. If

you are using two connections, connect the two probes to two channels

of the oscilloscope. If you are using four connections, connect the four

probes to 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 Settings, Connection Type and Number of

Channels according to the type of testing being done.

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Agilent Technologies DisplayPort Manual de Serviço Página 166