The Design Of Data Acquisition Based On USB Bus

Data acquisition and data storageare the important part of digital signal processing. High-speeding data transmission has a very important significance to the total digital system. Making use of the USB bus to make high-speeding data transmission, totally resolves the speed-choke-point question. Its application has been into digital signal processing in all areas.Because of its high speed, high reliability, low cost and good compatibility, USB local bus dominated in a variety of computer bus standard, so designs based on the USB bus interface standards have become a priority choice in related project development.This article mainly reserchs from hardware and drive program of the high-speeding USB Data acquisition and data storageare system,having designed out the total precept.The hardware part includes signal pretreatment,A/D convert-module,D/A convert-module,FIFO cache circuit,USB bus interface circuit,CPLD control-circuit and periphrial circuits.In this article,including all the hardware circuit modules actualizing-processes, and giving out all the key-questions disposal-methods,and giving out the hardware's design and check-out of the system. The use of CPLD is very flexible, a CPLD with different programming data can produce different logic functions.CPLD has been widely used in the communications, data processing, network, equipment, industrial control, military, aerospace and many other fields.This board achieves software or hardware triggered sequence or group data acquisition, A/Dopts hardware automatic switching access, and realizes hardware preventing the data disorder through the A/Doption of effective measures.Having acchieved all the demands of the card.