Integrity rules for power and ground planes:
For areas with dense via holes, care should be taken to avoid the holes being connected to each other in the hollow area of ​​the power supply and the ground layer, forming a division of the plane layer, thereby destroying the integrity of the plane layer, and thus causing the loop area of ​​the signal line in the ground layer to increase. .
Rules for overlapping power and ground layers: Avoid overlapping spatially between different power layers. The main purpose is to reduce the interference between different power supplies, especially between some power supplies with large voltage differences, the overlapping problem of the power supply plane must be avoided.