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Widely Application of USB Device by 3w mr16
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Widely Application of USB Device |
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Business
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Computer USB Design
With the rapid development of computer hardware, and the number of peripherals is growing day by day, such as the keyboard, mouse, modem, printer, and scanner has long been well known by many people, and then the digital cameras, MP3 players follow up, so much equipments, how to access to the personal computer? This is a question. Use USB! The usb design is a computer peripheral device connected to standardization, a single interface, and its specifications are jointly developed by Intel (Intel), NEC (Nippon Electric Co., Ltd.), Compaq (Compaq) DEC (Digital Equipment Corporation), IBM (International Business machines Corporation), Microsoft (Microsoft), northern Telecom (Northern Telecom).
USB1.1 Device
The transfer rate of USB1.1 standard interface is 12Mbps, but a USB device can only get 6Mbps of bandwidth at most. To an external drive, it can by far be able to take up to six-speed CD-ROM, the speed can be no longer high. If to real-time playback a MPEG-1 VCD movie, it needs at least 1.5Mbps bandwidth, USB 1.1 to do this, but is maybe very difficult to complete the MPEG-2 DVD movie which the data volume is four times larger than the common one. when coupled with the AC-3 audio data, USB devices, it is very very difficult to achieve real-time broadcast. An USB port can theoretically support 127 devices, but in fact this can not be achieved at present. In fact, for a computer, the peripherals connected is usually not more than 10, so this figure is enough for us to use in daily life. USB also has a significant advantage, that is hot swapping, which means that you can safely connect or disconnect the USB device with the machine on, to achieve the true on-plug and on-play. However, not all Windows system supports USB, in other words, not all wholesale usb is suitable for all Windows system. At present, for Windows system, there are many different versions, of these versions, only the Windows98 above system has better support for USB, while the other version of Windows does not support USB. Such as the retail version of Windows95 does not support USB, and only the later Windows95 version with the PC bundled sales supports USB.
USB 2.0 Devices
Although USB device is widely used now, but the more generally used is USB2.0 interface, its transmission speed is 480Mbps. The needs of users are the driving force to promote technological development, the manufacturers also recognize this bottleneck. At this time, COMPAQ, Hewlett Packard, Intel, the Lucent, Microsoft, the NEC and PHILIPS 7 vendors have jointly developed the standard of USB 2.0 interface. USB 2.0 data transfer speeds between devices has increased to 480Mbps, 40 times faster than USB 1.1 standard, the speed increases means the maximum benefit for users and users can be more efficient to use an external device.
This article is come from: http://www.usbdesign.cn/blog/?p=4
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