We customized the device tree in JetPack 4.3 for our custom board. Now we face the problem, that one USB3.0 Port (Signals UPHY_RX1_P/N Pins C22,C23 and UPHY_TX1_P/N Pins G22, G23) does not work as expected. USB3.0 devices get recognized only as USB2.0 after power-on. If we reconnect the device, it is correctly enumerated as USB3.0, so overall our configuration should be ok. The corresponding USB2.0 Signals (USB3_P/N Pins G10, G11) are routed to the A-Type USB3.0 connector over a USB2.0 Hub. It seems that this leads to the strange behavior. The Hub is enabled by a GPIO (AA, 3).
We have already checked multiple different threads and tested many solutions, but sadly none of them worked. We tried adding ramp-delays to the regulator and turned the Hub on by hand after boot up via the GPIO. But always the device was not enumerated correctly.
Do you have any other suggestions what we could try?
Thank you.
For the problematic USB Type-A port we use the USB3.0 Signal pins PEX_RFU_RX+/- (G39,G40), PEX_RFU_TX+/- (D39, D40) and the USB2.0 Signals USB2_D+/- (B42, B43) which go over a hub. The mentioned pins in the first post are wrong, sorry for that.
It happens to all USB3.0 devices that we tested so far.
Thank you.
Hi
As mentioned in the first post, turning on the VBUS after booting does not help. It has the same effect. When changing the GPIO to high, the device gets enumerated as USB2.0 device. When reconnecting the device, it again gets enumerated correctly as USB3.0 device. Do you have any other idea what to do?
Thank you.