52840 usb can't be recognized

[William.wei]

Hi support team,

customer is using 52840 usb, and when they did pressure test, they find out usb can't be recognized and set address.

below is normal usb sniffer.

and below is failure sniffer

i was suppect that out D+ and D- is not responding correctly;

and after failure happens, the usb hub can't recover this 840 usb slave(reboot 840 would not solve this issue), unless reboot usb hub.

there is no clue for me to analyse this problem, please help and give some suggestion.

Regards,

William.

[Sigurd]

Hi!

and when they did pressure test,

Could you elaborate on this pressure test? How was it done?

[William.wei]

Hi Sigurd,

i have onsite visit and tested together, it was simlpy plug in and out testing, and it is about  "1 of 100 " to "1 of 200"  chances that device would not be recognized.

Regards,

William.