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We took the design from the Evaluation board and we used it with Nvidia TX2I processor , we built 2 prototypes and the boards worked properly with all 4 ports including the USB3.0 and we went to pre-production of 25 boards and now we are noticing some of the board don't have the downstream on any of the port.
We can see The Suspend LED is On, until Linux boot and it turned Off
In Linux we can see the Hub but No other USB port are seen
We know the Chip is Alive
Power_en is never Low ( No attempt) Always High
No Over Current , High
Vbus is Off
We have 26.04MHZ
Reset is High
Mode Select to Default 11 (Default No Eprom)
we have 1.2V OK
Could you tell me what could prevent the Chip from Enabling the Power Switch to provide Vbus?