Resonance rules of traces: mainly for high-frequency signal design, that is, the length of the traces must not be an integer multiple of its wavelength, so as to avoid resonance.
Trace length control rules: short-circuit rules. In the design, the trace length should be kept as short as possible to reduce the interference problem caused by too long traces. Especially for some important signal lines, such as clock lines, be sure to set their oscillators Place it close to the device. In the case of driving multiple devices, the network topology to be used should be decided on a case-by-case basis.