USB 1.0 Advantages And Disadvantages

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. CHAPTER 4 UNIVERSAL SERIAL BUS 4.1. Introduction: Universal Serial Bus (USB) is a set of interface specifications for high speed wired communication between electronics systems peripherals and devices with or without PC/computer. The USB was originally developed in 1995 by many of the industry leading companies like Intel, Compaq, Microsoft, Digital, IBM, and Northern Telecom. The major goal of USB was to define an external expansion bus to add peripherals to a PC in easy and simple manner. The new external expansion architecture, highlights, 1. PC host controller hardware and software 2. Robust connectors and cable assemblies 3.Peripheral friendly master-slave…show more content…
Let us now try to understand more about the different versions of the USB. USB1.0: Version 0.7 of the USB interface definition was released in November 1994. But USB 1.0 is the original release of USB having the capability of transferring 12 Mbps, supporting up to 127 devices. And as we know it was a combined effort of some large players on the market to define a new general device interface for computers. This USB 1.0 specification model was introduced in January1996. The data transfer rate of this version can accommodate a wide range of devices, including MPEG video devices, data gloves, and digitizers. This version of USB is known as full-speed USB. Since October-1996, the Windows operating systems have been equipped with USB drivers or special software designed to work with specific I/O device types. USB got integrated into Windows 98 and later versions. Today, most new computers and peripheral devices are equipped with USB. USB1.1: USB 1.1 came out in September 1998 to help rectify the adoption problems that occurred with earlier versions, mostly those relating to…show more content…
USB hubs work transparently as far as the host PC and its operating system are concerned. Most hubs provide either four or seven downstream ports or less if they already include a USB device of their own. The host is the USB system's master, and as such, controls and schedules all communications activities. Peripherals, the devices controlled by USB, are slaves responding to commands from the host. USB devices are linked in series through hubs. There always exists one hub known as the root hub, which is built in to the host controller. A physical USB device may consist of several logical sub-devices that are referred to as device functions. A single device may provide several functions, for example, a web-cam (video device function) with a built-in microphone (audio device function). In short, the USB specification recognizes two kinds of peripherals: stand-alone (single function units, like a mouse) or compound devices like video camera with separate audio processor. The logical channel connection host to peripheral-end is called pipes in USB. A USB device can have 16 pipes coming into the host controller and 16 going out of the

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