TUSB8020B: How to output USB signal test pattern?

Paul Yeh

Genius 17735 points

Part Number: TUSB8020B

Hi team,

Customer would like to measure USB signal and check signal could meet specification or not.

So can you advise how to program TUSB8020 and output USB signal test pattern for their evaluation?

Below picture is customer's simple block.

Thanks

over 3 years ago

0 David (ASIC) Liu over 3 years ago

TI__Guru**** 187861 points

Hi,

They will need to install a USB compliance tool like the XHCI HSETT tool from usb.org on the CPU and then use the tool to enable the downstream ports of the TUSB8020B to generate the required test packet.

Thanks

David

0 Paul Yeh over 3 years ago in reply to David (ASIC) Liu

TI__Genius 17735 points

David,

Thanks.

And is there any software or tool can evaluate signal quality between CPU and USB Hub?

Thanks

0 David (ASIC) Liu over 3 years ago in reply to Paul Yeh

TI__Guru**** 187861 points

Hi,

The XHCI HSETT tool will be used to generate the test packet from the CPU. To evaluate the signal quality, you will have to break the physical connection between the CPU and the hub and then use USB compliance SW on a scope to evaluate the SI. But the hub itself does not have a way to verify the input signal quality.

Thanks

David

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TUSB8020B: How to output USB signal test pattern?