In high-speed circuit design, the correct use of decoupling capacitors is related to the stability of the entire board. Device layout partition/layering rules: The main purpose is to prevent mutual interference between modules with different operating frequencies, and at the same time, try to shorten the wiring length of the high-frequency part. Usually, the high-frequency part is arranged in the interface part to reduce the wiring length. Of course, such a layout still needs to take into account the possible interference of low-frequency signals. At the same time, the division of the high/low frequency part of the ground plane should also be considered. Usually, the two ground planes are divided, and then connected at a single point at the interface.