Research On Creation And Transformation Of Netlist Based On PCB Reverse Engineering

With the development of science and technology ,the production machine controlled by electronic equipment and the information system which based on electronic equipment, are becoming more and more popular .And so the efficient works of the electronic equipment have become the success of company and the critical factor of the government efficiency. As we all known, without the electronic equipment, the modernization of compony , public services, medical treatment ,etc, is imposible . PCB reverse engineering mainly involves image processing ,netlist source data refinement,the creation and transformation of netlist,the creation of schematic and so on.The output of the netlist source data refinement is taken as the input of subprogram of the creation and transformation of netlist,and the netlist is the main input of the schematic creation phase. The creation of netlist mainly deals with the holes,pads,wires,parts,pins and other netlist source data in order to create netlist. The algorithm of netlist creation based on dimidiate chart consider the circuit diagram as dimidiate chart, which includes the parts and the netnodes as its two vertex sets. The main problem of the algorithm is how to create the netnodes. The algorithm simplify the algorithm of transformation between two different netlists,but is need two netlist data structures.Netlist file has its lexical and syntax structure,and the input of it has something in common with the procedure of the computer program's translation. Lex and Yacc are the building tools of the lexical and syntax analysis programs in prevalence respectively. Using them can simplify the works of writing the netlist file input program. But the lexical and syntax structure of the netlist file, and the input file format of the Lex and Yacc have to be arranged carefully.