cadence中建立元件的流程(国外英文资料).doc

cadence中建立元件的流程(国外英文资料) One. Parts are established In the Allegro, there are five types of Symbol: Package Symbol, Mechanical Symbol, Format Symbol, Shape Symbol, and Flash Symbol. Each Symbol has a Symbol Drawing File (symbolic Drawing File) with the suffix name of *.dra. This drawing file is for editing only, not for the Allegro database. The Symbol that Allegro can invoke is as follows: 1. The Package Symbol The package symbol of the generic element, the suffix is called *.psm. All components in PCB are Package types such as resistors, capacitors, inductors, and IC. 2. Mechanical Symbol An organization symbol consisting of an outer frame and a screw hole. The suffix is called *.bsm. Sometimes our PCB design frame and screw hole position is the same, such as graphics, computer motherboards, each time to draw a design of PCB board frame and determine the screw hole position, appear more trouble. This is where we can make a Mechanical Symbol of PCBs outer frame and screw hole, and when the PCB is designed, the Mechanical Symbol will be pulled out. 3. The Format Symbol The symbol of the symbol, which is composed of the picture box and caption, is called *.osm. Less use. 4. Shape Symbol For the special shape of the welded plate, the suffix is *.ssm. As the graphics card of gold finger encapsulation of solder welding plate is an irregular Shape, in establishing the welding plate will be irregular Shape before welding plate Shape into a Shape of the Symbol, and then establish the Shape Symbol called welding plate. 5. Flash Symbol Connect the copper to the copper guide symbol, the suffix is called *.fsm. In PCB design, welding plate and its surrounding copper sheet is linked together, may all contain, can also be in the form of plum blossom distinguishes the connection, we could see this plum blossom bian built a Flash Symbol, the establishment of bonding pad calls when the Flash Symbol. The most widely used is the Package symbol, which is the electrical feature, and the