Photolithography Control System : A Case Study For Cyber-Physical System

Photolithography control system (PCS) is an extremely complex distributed control system, which is composed of dozens of networked microprocessors, hundreds of actuators, hundreds of thousands of sensors, and millions of lines of code. Cyber-physical system (CPS), which deeply merges computation with physical processes together, copes with complex system from a higher level of abstraction. PCS is a representative CPS. This work points out that thinking under the framework of CPS, which includes holistic perspective, model-based design, hardware/software co-design and continuous integration, could solve the issues presented in the current PCS. Although the traditional embedded system approach and the CPS approach would be coexisting in the PCS for a long time, the CPS approach is definitely the future of the PCS development.