USBX HS Not Working on stm32u595RJT6Q

[EdwardSon]

• custom board, The USB D+ and D− lines are connected directly from the MCU to the USB Type-B connector, with no intermediate components.
• There is no pull-up resistor on the D+ line, as I understand that the MCU provides the pull-up internally

• As far as I know, the stm32u595 supports USB High-Speed using its internal PHY.

CubeMX Version: 6.18.0

Reference project:
https://github.com/STMicroelectronics/STM32CubeU5/tree/main/Projects/STM32U5G9J-DK2/Applications/USBX/Ux_Device_CDC_ACM

I configured my .ioc file to match the reference project as closely as possible. UART is not used.

Issue:

I implemented a simple CDC ACM echo function to verify USB communication.

• In Full-Speed (FS) mode, the echo function works correctly. The PC recognizes the device, and both transmit and receive operate normally.
• In High-Speed (HS) mode, however, the PC does not recognize the USB device at all (it reports an unknown or unrecognized USB device), so communication cannot be established.

What could I be missing, or what configuration should I check?

[Gyessine]

Hello ​@EdwardSon 
can you share your .ioc file or some schematics
BR
Gyessine

[EdwardSon]

 

While preparing the schematic to attach, I noticed an issue with the circuit. The USB signals were connected to pins 2 and 3 of connector P2, but the connected diode had not been removed.

Once I removed the diode, the PC recognized the USB properly, and the communication was carried out smoothly. It was my mistake, and I truly appreciate your support and attention to this matter

 

[Gyessine]

Hello ​@EdwardSon 
thanks for providing feedback and how you managed to resolve the issue
BR
Gyessine