| With the development of network technique, automatic testing system is developing in the direction of networking. In this case, this dissertation details the development of LAN-based digital oscilloscope module to meet the requirements of Integration Missile Test Equipment on LAN.Firstly, this dissertation analyzes the situation of domestic and foreign research on this subject, then completes the system design of digital oscilloscope module under the functional and performance requirements. On this basis,μses ADC08200 to complete the conversion circuit of analog to digital with the highest real-time sampling rate of 200MSa/S. Completes the design of analog channel circuit which has a bandwidth of 40M(-3dB), and designs the data acquisition unit circuit, furthermore it realizes the simulation for the analog channels. In FPGA, it's embedded a NIOS II soft-core processor, clock generation module, trigger control module, FIFO memory module, frequency measurement module and local interface module, taking advantage of flexibility of FPGA for circuit design and its extensive hardware resources. And implement data capture,frequency measurement and other functions successfully, local interface can communicate with the LAN interface board and the NIOS II processer。In software design, the dissertation develops the PC module driver,the driver by calling the underlying driver functions implements the network communication with the LAN interface board. Develops a main program and a interrupt response program which runs on Nios II processor. The main program is to complete the hardware initialization, receiving the command and parameter, and execute the appropriate command function according to the command. When the command and parameter are writing, system will execute the interrupt response program, and then fully guarantee the reliability of communication.The results show that the system designed achieves the basic functions of a digital oscilloscope, and meets the design requirements. |
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