I'm designing an embedded system using the TUSB2036 USB hub and PCM2707 sound card. On the upstream side, the TUSB2036 is connected to linux computer module. On the downstream side, it is to be connected internal PCM2707 and external usb memory stick.
The problem is with TUSB2036 i suppose. When I don't connect external pendrive PCM2707 is working without problems. When I connect external memory PCM2707 stops working and in the linux logs i get
Cannot enable port 1. Maybe the USB cable is bad?
kern.err kernel: [ 22.170000] hub 1-1:1.0: unable to enumerate USB device on port 1
It happens with different isb sticks.
The application schematic is attached below. If anyone with more experience with TUSB2036 can see a problem on the attached schematic, your help would be greatly appreciated.