When wiring a PCB, prioritize ground and power lines, widen them as much as possible, and keep signal line width at 0.2-0.3mm. Ground wire should be wider than power wire, and high-frequency lines should be wired first. Avoid parallel lines, minimize clock line length, and use 45-degree polylines to reduce high-frequency signal radiation. Keep loops on signal lines small, minimize number of vias, and use “ground-signal-ground wire” approach for flat cable transmission. Reserve test points for key signals and optimize wiring after initial inspections. Add protective ground on key lines, and connect unused parts to ground.