Connect-Tek USB-16 Bedienungsanleitung PDF herunterladen (Seite 18)

Host High Speed Electrical Test Procedure Revision 1.4

Figure 8: Known-Good Device Enumerated

Note: The use of the TDSUSBF Device High-speed Signal Quality test fixture segment makes

it possible to trigger on packets generated by the device because the differential probe is

located closer to the device transmitter, therefore the device packets are larger in amplitude.

2. Attach the differential probe to J36 on the fixture near the device connector. Ensure the “+”

symbol on probe lines up with D+ on fixture.

3. Verify that the Test Init switch is in the Init position. Connect the TDSUSBF Device Signal

Quality test fixture segment (Init Port) into host controller port under test with a short USB

cable. Click Enumerate Bus and verify that the device enumerates properly.

4. Select Packet Parameter measurement from the High-Speed tab and configure the device for

EL_21, EL_23, EL_25. Run the measurements.

5. Using the oscilloscope, verify SOFs (Start Of Frame packets) are being transmitted on port

under test.

6. In the Host Test menu of the High-speed Electrical Test Tool software, ensure the device under

test is selected (highlighted). Select SINGLE STEP GET DEV DESC from the Downstream

Device Control menu and click Execute once.

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Connect-Tek USB-16 Bedienungsanleitung Seite 18