Allegro提供的零件制作的教程 虽然是英文，但是非常好 Chapter 2: Library Development Objectives In this chapter you will: I Generate Allegro padstacks. I Create package symbols. I Create mechanical symbols. I Create flash symbols. I Generate a master or template design file. Terms and Definitions Term Denition Padstack Binary files that define the geometry of the pads to be used in the physical part (package symbol). They also define the drill size and figure to be used for the drill drawing. Package symbol Physical parts (thru-hole or surface-mount components) Mechanical Standard card outlines or mounting holes symbol Format symbol Company logo, different page sizes (A, B, C, D)……