Teledyne LeCroy QPHY-USB3-Tx-Rx - Manual (Page 16)

16
917719 Rev A
GUIDE TO OPERATION
QPHY-USB3-Tx -Rx was designed to utilize the features of the SDA 8Zi and the PeRT
3
. When using these 2
instruments together, there are many benefits that are not available when using either instrume nt independently. If
the user wishes to use the PeRT
3
without the oscilloscope, the soft ware for the PeRT
3
must be used. One of the
many benefits of using the PeRT
3
is its ability to stimulate the Product Under Test (PUT) to out put the appropriate
compliance patterns required for transmitter testing. Additionally, QPHY-USB3-Tx -Rx can also utilize an RF S witch
to automate the switching of cables that would otherwise have to be manually configured by the user.
There are 2 types of electrical tests required by the SuperSpeed USB Electrical Test Specification: Transmitter
and Receiver tests.
Transmitter Testing
Transmitter testing requires the PUT to output specific compliance patterns and tests are performed on these
patterns. This can be done using only the oscilloscope. This requires the user to manually make the proper
connections between the PUT and the oscilloscope. Additionally, the user must be able to stimulate the PUT to
output the proper compliance pattern as required by QP HY-USB 3-Tx-Rx.
If the oscilloscope and PeRT
3
are being used together (and the PUT supports Ping.LFPS), then the PeRT
3
can be
used to stimulate the PUT to enter compliance mode and transmit the proper compliance pattern . This makes
transmitter testing completely automated.
Receiver Testing
Receiver testing requires the PUT to be put into Loopback mode and the jitter tolerance of the receiver is
measured over 8 frequencies of sinusoidal jitter. When using the PeRT
3
alone, receiver testing can be performed
manually using the PeRT
3
software application. This requires the user to manually make the proper connections
between the PUT and the PeRT
3
. This is not supported by QPHY-USB3-Tx -Rx.
If the oscilloscope and PeRT
3
are being used together (and the PUT supports Loopback mode), then the PeRT
3
can be used to stimulate the PUT to enter loopback mode and then perform the jitter tolerance test as required.
Transmitter and Receiver Testing
When adding the RF S witch to the setup, fully aut omated transmitter and receiver testing is possible. Th e RF
Switch automatically routes the rec eiver of the PUT to the transmitter of the PeRT
3
and the transmitter of the PUT
to the oscilloscope. In this configuration, all of the transmitter tests can be performed. When these tests are
complete, the RF Switch automatically switches in the complianc e test channel in between the transmitter of the
PeRT
3
and the rec eiver of the PUT. Additionally, the transmitter of the PUT is routed to the receiver of the PeRT
3
.
In this configuration, the jitter tolerance test can be performed.
Using QPHY-USB3-Tx-Rx
The QualiPHY soft ware makes it easy to test a product for compliance. The extent to which QualiPHY can
automat e the instruments and P UT depends on the equipment available and the capabilities of the product under
test. There are three supported hardware configurations in QPHY-USB3-Tx-Rx: Oscilloscope only, Oscilloscope
and PeRT
3
and Oscilloscope and PeRT
3
with RF Switch. For each hardware configuration there are
corresponding configurations in QualiP HY that are selectable in the top dialog. Refer to the QP HY-USB 3-Tx-Rx
Test Configurations section of this manual for more information about selecting configurations.
Oscilloscope Only
Customers that do not have a PeRT
3 should select one of the “Scope Only ” configurations. Thes e configurations
can also be selected for reduced automation and more hands -on testing, which can be useful for debugging or if
the PUT does not respond well to automation from the PeRT
3
. When using these configurations the QualiPHY
software automat es the oscilloscope and sets up all the tests. At the appropriate time QualiPHY prompts the user
to make connections to the PUT and to control the P UT to output the proper test signals . Then QualiPHY resumes
the tests and continues to aut omate the oscilloscope.