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What are the trends and key features of USB?

Writer:Dongguan Zhongyou ElSource:www.hisetec.com Date:2017-6-18 17:04
development trend 
USB future trend, under the strong support of Intel, firmly hold the current PC market mainstream status should be no big problem, as to replace the IEEE 1394 in the high bandwidth consumer electronics market, is bound to encounter a hard battle, and The key to the decision is the maturity of the USB 2.0 hardware. There will be such an idea, mainly based on cost considerations, due to USB1.1 hardware, SIE and PHY are 12MHz as the reference frequency to action, so whether it is ASIC or FPGA, can use a single Chip to solve. However, USB PHY part of the PHY is to use high-frequency 480MHz to action, and SIE only 30MHz or 60MHz is enough. According to this view, USB 2.0 early if the two chips to practice the solution, the cost is bound to increase, will make the original USB hardware cost advantage of a lot of fade.
Key Features
  (1) plug-and-play (plug-and-play): USB with automatic detection function, so no need to worry about whether the computer system resources conflict situation can be installed at any time.
  (2) hot add and detach (hot attach and detach): USB hot dial feature makes the use of USB interface can be very convenient to plug a variety of hardware, without having to worry about whether the hardware is damaged. It also supports connecting multiple different devices in series, a USB interface can connect up to 127 USB devices. USB devices will not have IRQ conflicts because they will use their own reserved interrupts alone, so they will not use the computer's limited resources to achieve true "plug and play", and we will not have to worry about IRQ conflicts. This is also the USB product compared to the original serial port, parallel products have obvious advantages of the side. (3) speed: speed is one of the most prominent features of USB, USB1.1 interface, the highest transfer rate can reach 12Mbps, compared to the traditional serial port, parallel port transmission speed much faster. And the new USB2.0 standard maximum transfer rate will reach 480Mbps, which is 60Mbyte / s. This is the USB in such a short period of time to quickly spread the root causes, such as Modem, ADSL, Cable Modem, printers, scanners, digital cameras, etc. have to provide support for the USB interface, the introduction of its USB interface products.
  (4) low cost, wide application: This is the biggest feature of the USB standard, and it is now compared with the IEEE 1394 standard has a clear advantage of the side. USB interface technology compared to IEEE 1394 technology is relatively simple, so usually do not need a separate chip support, but can be attached to the motherboard chip, thus saving the fixed cost of the device, which has a practical basis for the application. Because of this reason, coupled with its high-speed features, so USB technology in a few years time in a variety of equipment has been rapidly popularized and applied. At present, USB can be used in common PC and peripherals, it is also widely used in multimedia devices, support USB sound card and speakers can better reduce noise.
  (5) Scalability: that is, in front of the mentioned, a USB controller in the hub with the next, can be expanded up to 127 external peripheral USB device
  (6) self-powered: USB devices no longer need to use a separate power supply system, and the use of serial devices and other equipment need independent power supply. USB interface built-in power lines, you can provide low-voltage equipment, 5V power. Also like the original serial port, parallel port device superiority side, but this only applies to low-power devices such as the mouse and so on.
(7) Power management: When the USB device is not used, it will automatically enter the power-saving mode.
  USB-based peripherals will gradually increase, and now meet the USB requirements of the peripherals are: modem, keyboard, mouse, CD-ROM, game controller, floppy drive, scanner, etc., rather than independent I / O connection peripherals will be gradually reduced. That is, host control peripherals to reduce the number of intelligent control control peripherals increased.
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