Technical data

154 Notes on USB Electrical Compliance Testing
5 Host Hi-Speed Electrical Tests
EL_55 SOF EOP Width Test
Test Instructions
The USB automated test application will prompt you to perform these
steps:
1 Using the oscillopscope, verify SOFs(Start of Frame packets) are being
transmitted by the port under test. You may need to lower the trigger
level to somewhat below 400mV to obtain a trigger.
2 Click OK to close the Test Instructions dialog.
Viewing Test Results
1 When the Testing Complete dialog appears, click OK.
The Results tab shows the test results.