范文编号:JD858 范文字数:36453,页数:66 摘 要 为解决计算机外设种类的日益增加与有限的主板插槽和端口之间的矛盾,IBM、Inter、DEC、ComPaq、Microsoft、NEC和NorthTlecom等厂商于1994年底制定了一种新的PC外设接口标准——USB。USB具有传输速度快,支持热插拔和即插即用,易于扩展,占用的系统资源少等优点。USB1.1支持两种传输速率:1.5Mbps和12Mbps ,而USB2.0将速度提高了40倍(即480Mbps),能够满足高速外设的需要,但价格也随之提高。 关键词 USB; 数据采集; USB1.1
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 North Tlecom have developed a new interface standard of PC-- USB (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. Key words: USB; data acquisition; USB1.1 目 录 1 绪 论 1
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