The Design Of A/D Signal Acquisition System Based On PCI Bus

Many continuously variational prameters in all kinds of acquisition systems are analog parameters . But computer only can process operation according to binary system. The method that transforms analog parameters to digital parameter is called A/D.It is necessary to apply A/D in experimentation and production process. So, How to realize the interface between A/D and computer is an important part in computer control system. After computer has been based on Windows system,It is necessary to push out a new acquisition system , which is based on PC system , with high performance to satisfy its requirement. PCI bus is a new advanced computer local bus, which is becoming the mainstream of PC system. At the same time, ISA bus with low transmission rate will be washed out. The project is to design an Imaging Signal acquisition system based on PCI bus.The paper introduces the property of PCI bus, describes the signals and commands and the transfer protocol of PCI bus, focuses on two key techniques of PCI bus: Interrupt Procession and Configuration technologies. The project adopt PLX PCI9050 chip to design Imaging Signal acquisition; and adopt complicated programmable logic device(CPLD) to design the control part of the system.Device driver is the bridge between hardware and Windows 95/98. Device driver is an important guarantee for hardware working order. Device driver relate with not only hardware device but also operation system kernel. The paper describes Windows95/98 system structure and the driver's function, introduces some popular driver development kit, such as DDK, VtoolsD, and WinDriver. Then analyzes the common problem what will meet in PCI device driver development and their solutions. At last , introduces the applied program including PCI bus access and image signals acquisition and processing.