DSOX4USBSQ USB 2.0 Signal Quality Analysis Application Electrical Testing Notes
3
USB 2.0 Signal Analysis—At a Glance
The DSOX4USBSQ USB 2.0 Signal Quality Analysis application for the
InfiniiVision 4000 X- Series oscilloscopes supports two use models:
•
You can quickly test USB signal quality in- circuit with real- world
packets. In this case:
•
You can use test fixtures as an easy way to probe signals.
•
The USBSQ analysis application's Auto Setups may need to be
adjusted before analyzing real- world packets.
•
You can verify signal quality to USB 2.0 compliance specifications. In
this case:
•
You must use the test fixtures, equipment, and test setups required
by the USB Implementers Forum (USB- IF).
•
The USBSQ analysis application's Auto Setups should work as is for
the required test packets.
The signal quality analysis application:
•
Lets you select Hi- Speed, Full Speed, or Low Speed tests for Devices
and Hosts. Hubs can be tested by running both device and hosts tests
against the hub.
•
Runs all the signal quality tests for the selected speed and device type
combination.
•
Automatically sets up the oscilloscope for the selected tests.
•
Provides detailed results information for each test that has been run.
•
Lets you save the detailed results information to an HTML report.
In This Book
This manual contains notes on the electrical tests that are performed by
the DSOX4USBSQ USB 2.0 Signal Quality Analysis application; it describes
the equipment used and how the tests are performed. It has these
chapters:
•
Chapter 1
, “Preparing for Signal Quality Analysis,” starting on page 7
•
Chapter 2
, “Device Signal Quality Testing,” starting on page 19
•
Chapter 3
, “Host Signal Quality Testing,” starting on page 39
•
Chapter 4
, “Hub Upstream Signal Quality Testing,” starting on page 53
•
Chapter 5
, “Hub Downstream Signal Quality Testing,” starting on page
65
•
Chapter 6
, “Saving Test Results to an HTML File,” starting on page 81
•
Appendix A
, “Probing Hi- Speed Signals with InfiniiMode Using SQiDD
as a Feedthrough,” starting on page 83
See Also
•
The USB 2.0 developers documents are available at the USB
Implementers Forum web site,
"http://www.usb.org/developers/docs"
.
