Research On High Density Data Acquisition System Based On Network-on-chip

In the research and development of modern large-scale equipment,it is usually necessary to measure and collect various physical parameters of temperature,humidity,vibration,and electrical properties.However,facing the monitoring requirements of such a variety of high-density parameters,the data acquisition system often needs to control the readout and transmission of data by connecting various sensors.The speed is different,the traditional bus-based acquisition system is subject to timing,control and other issues,it is difficult to coordinate these situations,and it also lacks flexibility.At present,the industry's first mixed-signal oscilloscope has both analog channel sampling and typical digital interfaces such as SPI and UART.The interfaces are rich and can be connected to various sampling sensors.However,the number of channels is obviously not enough to satisfy many parameters at the same time.monitoring needs.For this reason,this paper proposes to apply the network-on-chip to the data acquisition system,using a unified data readout and transmission method based on "data packets",and cooperating with the programmable microcode interface controller,it can realize the high-efficiency of multitype and multi-channel sensors.Flexible coordination of sampling speed and accuracy of different sampling channels in density data acquisition system.The research work done in this paper is divided into the following four parts:1.The overall architecture design of the data acquisition system based on the network-on-chip.The feasibility of applying network-on-chip to high-density data acquisition system is analyzed,and the topology of network-on-chip suitable for data acquisition system is proposed.Finally,the overall architecture of network-on-chip based high-density data acquisition system is designed.2.Design of a microcode-based configurable interface controller.A configurable interface controller based on microcode is designed,so that the system can adapt to sensors with different protocol interfaces,and the key circuit design of the configurable interface controller is completed.By changing the microcode configuration file corresponding to the protocol,rate and bit width,simulating SPI protocol,UART protocol interface sampling,not only can realize the interface protocol can be configured,but also can realize the SPI protocol interface sampling data bit width and rate can be configured.3.Design of network-on-chip key circuits for data acquisition.Through the on-chip network transmission requirements for data acquisition,an on-chip network topology suitable for data acquisition systems is designed,and the key circuits of the heterogeneous routers in the topology are designed,including routing algorithm and micro-architecture design,and finally the output interface design is completed.4.The whole system is verified by FPGA.In this thesis,the hardware platform is built,the FPGA design project is downloaded to ZYNQ board,and the results are displayed on the software interface through the upper computer software.The results show that the system can meet the application requirements of simultaneous monitoring of many different types of high-density data,such as different sampling precision and different sampling speed.