Research On Data Acquisition System Based On CAN Bus And CPLD

CAN bus has high real-time performance and has been extensively used in automobile industry and industry control. The data acquisition system based on CAN bus all used CAN controller in the past, which impact the scalability of the system. In accordance with the actual application , this paper provided a kind of data acquisition system based on CAN bus,which using CPLD to simulate the function of CAN controller chip MCP2515 ,without using the physical CAN controller chip..This paper shows the overall stucture of the system and the circuit of various part of the system. And then explain protocol CAN 2.0B and internal stucture and some features of the CAN controller MCP2515 thoroughly,which is the base to design the CAN controller in the data adquisition system. The RTL design process of the CAN controller is done according to the specification, it contains data flow processor, acceptence filter and timing processor.Finally, this paper verifies the CAN controller. The verification process contains functional verification.