The Study On The High-Speed Data Acquisition Card Based On PCI Bus

With the swift development of LSI(Large Scale Integration) and computer science, the digital technology has come into every field of knowledge. As analog signals are the most physical signals in the nature, the conversation from analog signals to digital ones has been the most important step on the way of signal procession and analysis control. Data acquisition system converts analog signal to the digital one, which can be identified with the computer.Conditional data acquisition system is designed based on ISA bus. With the limits of the bandwidth of ISA bus, it is difficult to perform the high-speed data transmission. PCI local bus, with the outstanding capability and excellent adaptation, has resolved this problem and become the main bus in the computer. The development of data acquisition system based on PCI bus has taken the lead of the high-speed data acquisition.The design of a data acquisition card based on PCI bus, including hardware development and driver program, is discussed in the paper. The basic configuration of PCI bus is introduced, as well as S5933, the core component in the card, which performs the control of PCI interface. The accession of a data buffer storage is a effective measure to improve the speed of the data acquisition. In the paper, the data is transferred via the S5933 Pass-Thru data transfer, with a dual-port Static Ram. The interface circuits and time logic of other chips that compose the card are also inferred. CPLD (Complex Programmable Logic Device), which is designed to control the time logic of the whole card, is described with the schematics and ABEL source programme. At the end of the paper, the development of driver program VxD is mentioned.In the practical measurement, the designed card has acquired the data successfully and also completed the single-channel conversation of D/A. According to the analysis of the sampling signals, the design is proved to be a success and the performance meets the expectations.