Design and Implementation of Embedded Finite State Machines in CAD Systems

Finite state machine is needed in nearly all the CAD system. switch,case clause are used to design the corresponding statechart diagrams in normal CAD systems. But it can easily cause logical confusion and it is difficult for developers to design and test the modules of the statemachine. To some extent,it will prevent us from synactic developing. A normal finite state machine can be designed just as draw a statechart diagrams with the machine class mentioned in the paper,and with lesslogical confusion. The nested state machine based on the normal state machine allows synatic developing and module testing, it can improve the efficiency of development.