The Design And Realization Of USB2.0 Interface In Data Acquisition System

In order to resolve the conflict between the increase of PC peripheral devices and the limited board slot and port, IBM, Intel, ComPaq, DEC, Microsoft, NEC and NorthTlecom have developed a new interface standard of PCæ¡¿SB (Universial Serial Bus) in 1994. USB has the advantage of high speed, HotPlugIn, Plug and Play, easily to expand and engrossing less system resource, etc. USB1.1 has two kinds of speed: 1. 5Mbps and 12Mbps, but USB2.0 has the speed of 480Mbps, which can meet with the demands of high_speed peripheral devices.This subject discusses the architecture and feature of USB, including bus attributes, signal environment, data flow model, and so on. After that, it brings forward a design scheme of data acquisition card with USB2.0 interface and digital signal processing, which is based upon the defects of traditional industry bus, such as ISA, PCI. Then it designs and realizes the hardware system of the data acquisition card with the USB interface, programs firmware of CY7C68013, and realizes the communication between CY7C68013 chip and HPI interface of DSP. At last, it programs the USB device driver of data acquisition card.Based on the subject, this paper introduces the USB bus technology at first and then shows the design of data acqusition system, which includs four segments: hardware design, firmware design, device driver and application program. In hardware segment, the performance of CY7C68013 is described firstly, and then hardware design scheme is given detailedly. For the firmware design, it is the most important project and the paper introduces the design of GPIF in detail. In driver program segment, the paper shows how to choose the driver develop tools and introduce the USB device driver of this data acqusition card. At last, a summary will be presented as the end of the paper.