Connect-Tek USB-16 Bedienungsanleitung PDF herunterladen (Seite 29)

Host High Speed Electrical Test Procedure Revision 1.4

15. Click Enumerate Bus. The oscilloscope capture should appear as follows.

Figure 17: Time between SOF and Last Chirp- (J or K)

16. The application measures the time from the end of host Chirp-J/K to the first SOF sent out by

the host. The result (EL_35) should be this 100 μs ≤ TDCHSE0 ≤ 500 μs.

17. Repeat steps 5 through 16 for the remaining down stream facing ports.

4.8 Host Suspend/Resume timing (EL_39, EL_41)

1. Connect the short USB cable dongle of the HS Device SQ segment of the TDSUSBF test

fixture into the upstream facing port of the known good high-speed device. Connect the Init

port of the test fixture to the host port under test. Apply power to the device. Ensure that the

Test Init switch is in the Init position.

2. Connect Channel 2 and Channel 3 FET probes to the test fixture at J36. Connect Channel 2 to

D- and Channel 3 to D+. Connect the probe grounds to the outside pins of J36.

3. Select the High Speed measurement tab> More > Suspend measurement.

4. Set the input Signal Direction and run the measurements.

5. Attach the INIT port of the fixture into the port under test at the host controller.

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Connect-Tek USB-16 Bedienungsanleitung Seite 29