The Development Of Open CNC System Hardware Platform Based On SOPC Technology

Open CNC System has solved many problems of the Traditional Closed System, such as bad compatibility, bad extensibility of its function, awful flexibility. The open style has become the direction of modern numerical technology's development. Following on the heel on the development of embedded system, this thesis develops a Hardware platform of Open CNC System using a new technology of embedded system design——SOPC.After analyzing the characteristics and system structure of the Open CNC System, this thesis develops a NC-embedded PC structure based on Open CNC System Hardware Platform, which has master-slave architecture. As a host, the master adopts the general industrial computer, which takes charge of weak real time tasks such as HMI function and document management function; the slave adopts NC platform based on the SOPC technology, which takes charge of hard real time tasks including interpolation, motion control etc. The whole system can be expanded easily, because it has clear level structure, and provides a unified interface through various forms; the system hardware platform has many features, such as portability, operability and scalability. Also, according to different user needs, it can build user-oriented control system rapidly, efficiently and cost-effectively.As the Open CNC System data interface between the modules, the Parallel Bus has low cost, flexible configuration features etc. Each module of the Open CNC System can achieve different configurations conveniently and flexibly through the Parallel Bus Interface, this can enhance the flexibility and compatibility. This thesis discusses several solutions of Paralel Bus Interface detailedly, and develops ISA Bus Interface, PCI Bus Interface and DMA channel transmission. In the course of data transmission, the real-time data communication can be realized between master and slave through the daul-port RAM.In the realization process of SOPC solutions, we use the programmable logical resources and the IP core to make up of the Embedded System. The system design is realized and validated successfully by the result of testing. The feasibility of SOPC based on Nios II processor is validated too. Try the new SOPC technology in development of software and hardware design. It shortens the design period, saves upgrade cost and optimizes the performance and resources.