there is OEM usb hub board that use IC CY7C65640-LFC to be usb controller and we found usb intermittent lost communication for many time then take board out to check don't see any component bad. looking datasheet of CY7C65640-LFCX-E there is many improvement. can anyone share idea for what possible root cause for lost communication from CY7C65640-LFC and how to fix to improve reliability.
Please attach USB traces with a software or hardware analyzer when the failure occurs in the communication. Does the issue occur every time?
You can refer to the Application Note-https://www.cypress.com/file/122726/download which is HX2VL hardware guidelines but can be used as a schematic review guide for HX2LP as well.