Hello friends,
Hardware Details
MCU: STM32N657Z0H3Q
Configuration: Custom PCB design
Boot Mode: Attempting USB Boot (BOOT0=HIGH, BOOT1=LOW)
Power: 1.8V system, SMPS for CORE (as per datasheet)
Problem Description
I've designed a custom PCB using the STM32N657Z0H3Q and I'm facing issues getting it to enter boot mode. When I connect the board to my PC with BOOT0 pulled HIGH and BOOT1 pulled LOW, the USB device is not recognized by STM32CubeProgrammer.
I've verified all power rails are providing the correct voltages. I've also tried multiple cables and USB ports to rule out simple connectivity issues.
Additionally, I attempted using ST-LINK for programming but that's failing as well, which makes me suspect there might be a fundamental issue with my circuit design.
What I've Tried
Confirmed all power supplies are providing expected voltages
Verified boot pin configurations (BOOT0=HIGH, BOOT1=LOW)
Tried multiple USB cables known to work with other devices
Checked connections against reference documentation
Questions
Are there any known issues with USB boot mode on this specific MCU variant?
Could anyone with experience on the STM32N6 series suggest common pitfalls with the boot configuration?
Are there specific requirements for the USB peripheral configuration I might be missing?
I've attached my schematic for reference. Any help identifying potential issues would be greatly appreciated!
Thanks in advance!
@Raghavendradp @S.Suriya PRAKASH
