CPLD Solution for Multi-dimension
Motion Control System
Abstract: Generally speaking, stepping motor is the best choice to control the movement of the mechanism accurately by a motor. The movement of stepping motor can be controlled by a number of input pulse signal. Although analog circuit can generate continuous and adjustable pulse signal, it is difficult to control the movement of the motor accurately by MCU. The above problem can be eliminated by the using of digital integrated circuit.
Nowadays, the VHDL+CPLD design method is used for more and more designs of digital integrated circuit. VHDL can be compatible easily to different design platform. VHDL+CPLD design method not only can improve the digital system design to make it efficiency and flexibility greatly, but also can shorten the cycle of the product development and make the product to be sold in the market much more quickly. VHDL+CPLD design method is an innovation of digital system design, which will be developed to be the main trend in the future.
The paper describes the differences among the designing methods of digital system. It also makes people know the advantages of VHDL language. At the same time, the paper introduces the complex programmable logic device and focus on taking Altera company product as an example, which supports the advantages of VHDL+CPLD when it is used to design more and more complicated digital system. In the paper the whole process to design a digital stepping motor control system by VHDL+CPLD is showed, including the instruction of parts in this system, and the process of using VHDL to write the source code. It also shows CPLD extended circuit design, the theory about the whole system structure, etc. And then it concludes the experiences from this design. At last, it gives some thoughts on how to improve the design, and how to analyze a design project. And make a conclusion for the whole design.
Keywords: VHDL, CPLD, Stepper Motor, Motion Control System