关键词: 数据采集控制器, 时间戳, 实时性, 多通道, 现场可编程门阵列

Abstract: In order to improve the real-time performance of Data Acquisition Controller(DAC) based on general PC,a multi-channel real-time data acquisition controller is designed.By using the Field Programmable Gate Array(FPGA) hardware technology,the data acquisition of the finite state machine is used to replace the CPU serial instruction to realize channel switching and data cache,which can reduce the load of the system.Based on the new data acquisition controller architecture,a timestamp synchronization mechanism is proposed to improve the real-time performance of the DAC control system with the multi-level buffer mechanism,and the logic of the controller is successfully transplanted to the Cyclone IV chip for implemention.The test results show that the proposed controller can alleviate the load of CPU and operating system,and improve the real-time performance of data and the precision of sampling bandwidth.

Key words: Data Acquisition Controller(DAC), timestamp, real-time, multi-channel, Field Programmable Gate Array(FPGA)