Hello,
I have been working on a project that requires USB communication with an STM32H7 mcu. Unfortunately, the computer cannot recognize the device. On the hardware side, I am using the STM32H725VGT6 mcu, an isolator, and a USB-C connector with some ESD protection. On the software side, I am using the internal FS PHY. The clock source is connected to PLL1Q running at 110 MHz. Windows couldn't even detect the device. What could cause this problem? Connections on the PCB are confirmed ok, and the isolator gets both the high side (5 V) and low side supply (3.3 V).