1. The purpose of PCB design should be clearly defined. For critical signal lines, both the wiring length and ground loop management must adhere to strict standards. For low-speed or less important signal lines, a slightly lower wiring priority is acceptable. Key considerations include: power supply segmentation; requirements for memory clock lines, control lines, and data line lengths; as well as high-speed differential line routing, among others. In Project A, a memory chip is utilized to implement 1G DDR memory, making the routing for this component particularly crucial. It is essential to account for the topological arrangement of control and address lines, manage the length disparities of data and clock lines, and more. During implementation, specific wiring guidelines can be established based on the chip’s data sheet and actual operating frequency. For instance, the length of data lines within the same group must not exceed a specified number of mils, and the length difference between channels should be limited to a certain number of mils. Once these requirements are established, PCB designers can be explicitly tasked with adhering to them. If all critical wiring specifications in the design are clearly outlined, they can be translated into overall wiring constraints, enabling the use of automated routing tools in CAD software for PCB design. This approach is increasingly becoming a trend in high-speed PCB development.