I am using a usb hub : usb2517. The problem is I can't get it works properly :
- when I use it with a 3.3v power supply the hub is not even recognize by the IMX6 (processor).
-when I boost the voltage regulator up to 3.5V, the hub works perfectly (recognized by IMX6 and I can communicate with the usb ports etc...)
Even when no equipement is plugged (so no external load for the Hub and not too much current needed) the 3v3 does not make it works...
I have double and triple tchek the 3.3 (or 3.5V...) power supply, the VDD18, XTAL1 PIN (external oscillator 10ppm, no crystal here), XTAL2 not connected. The reset timing also seems good. The 3v3 is created from a +12V through a Dc/DC then a LDO and the ripple is under datasheet recommandation.
I respected all the implementation note etc...
If anyone knows something about that, please help!
Thank you in advance !