TUSB8041A: Loopback mode feature

Hi Yaita,

The TUSB8041A should be able to enter all states necessary for USB compliance testing.  Is there a specific test that is of concern or not working?

Regards,

JMMN

Hi JMMN-san,

Thank you for your reply.

My customer designed thier system with TUSB8041A however compliance test is failed at Rx Short Channel Test.
It is a curious thing Rx Short Channel Test is failed although Rx Long Channel Test is passed in this case.
Do you have heard the same issue?

I would also like to know if specific setting is required for TUSB8041A when doing compliance test.

Best Regards,
Yaita

Hi Yaita,

Which portion of the short channel test is failing?  Since the test fixtures for this test are not defined, we have seen some customers with setup issues.  We are able to pass this test in our lab and 3rd party test house.

Regards,

JMMN

Hi JMMN-san,

Thank you for your continuous support.

>Which portion of the short channel test is failing? 
They are upstream port and two downstream ports of TUSB8041A.
My customer uses only two ports of downstream ports, so in other words all ports are failing at Rx Short Channel Test.

>Since the test fixtures for this test are not defined, we have seen some customers with setup issues. 
Is there possibility the failure is due to a test fixture?
If you need further information please send me e-mail.
I can share my customer's schematic and so on in offline.

Best Regards,
Yaita