Analog signals and digital signals, power lines and control signal lines, weak signals and any other signals cannot be routed side by side, and should be routed in layers (preferably with ground isolation) or far apart. If the lines of the adjacent layers of the layer need to cross the lines, the lines cannot be run in parallel. In order to reduce the crosstalk between lines, the line spacing should be large enough. When the line center spacing is not less than 3 times the line width, 70% of the electric field can be maintained without interfering with each other, which is called the 3W rule. To achieve 98% of the electric fields do not interfere with each other, a 10W spacing can be used. Note: When wiring the clock, you must pay attention to the effective isolation from the data line and the control signal line.