Crystal Oscillator; Power Supply Decoupling; Figure 21. Six Layer Pcb Stack-Up Example - ST STM32F74 Series Getting Started

AN4661 Recommended PCB routing guidelines for STM32F745xx/STM32F756xx devices
8.2

Crystal oscillator

Use the application note: Oscillator design guide for STM8S, STM8A and STM32
microcontrollers (AN2867), for further guidance on how to layout and route crystal oscillator
circuits.
8.3

Power supply decoupling

An adequate power decoupling for STM32F74xxx/STM32F75xxx devices is necessary to
prevent an excessive power noise and ground bounce noise. Please refer to
Power supply
Figure 22
STM32F74xxx/STM32F75xxx closer to pins and with less vias:

Figure 21. Six layer PCB stack-up example

scheme.
shows an example of placing bypass capacitors underneath
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