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sorry wrong forum.
SMH said:STM32H745
This is a question for ST - nothing to do with ARM.
ST should have documentation on PCB design recommendatioons for their chips ...
https://www.st.com/en/microcontrollers-microprocessors/stm32h745-755.html
https://www.st.com/content/st_com/en/support/support-home.html
community.arm.com/.../158950