论文部分内容阅读
USB是一种用电缆把外部设备(简称外设)连接到PC的串行数据传输系统。所有新的计算机都有二个以上的USB插座,人们预测这种USB插座将取代老式机型上的大多数既有插座。USB的1.0标准和2.0标准分别适用于1.5Mbps低速率和12Mbps全速率传输。这两种标准是为低速外设和中速外设制订的。最新的2.0标准适用于480Mbps速率,将与许多高速外设以及以前的低速和全
USB is a serial data transfer system that connects external devices (peripherals) to a PC using a cable. All new computers have more than two USB sockets and one is expected to replace most existing sockets on older models. USB 1.0 standards and 2.0 standards apply to 1.5Mbps low rate and 12Mbps full rate transmission. These two standards are for low-speed peripherals and medium-speed peripherals set. The latest 2.0 standard for 480Mbps speed, with many high-speed peripherals and the previous low-speed and full