USB 3.0 Definition 
    USB 3.0 is the latest USB standard, the standard was launched by Intel and other large companies. USB 2.0 has been generally recognized by PC makers, interfaces, hardware vendors have become an essential interface to see family often used to clear the motherboard.

  USB 3.0 interface, with the continuous development and progress of hardware devices, higher transmission speeds and greater bandwidth has been growing attention. 
  The maximum transfer rate of USB2.0 as 480Mbps, or 60MB / s. However, we should note that this is the theoretical transfer value, if several devices share a USB channel, the main control chip, each device will be disposable bandwidth allocation, control. Such as USB1.1, all devices can share the 1.5MB / s bandwidth. If a single interface to all USB devices that take up bandwidth, they would use to other devices difficult.
  USB2.0 High Speed: theoretical speed is 480Mbps, the corresponding previous USB2.0;
  USB2.0 Full Speed: theoretical speed is 12Mbps, which is the last of USB1.1.
  2007, Intel in the IDF on the SuperSpeed USB as an important topic out to show. To November 17, 2008, USB 3.0 is the formal criteria for completion and public release.
   At the same time the implementation of the new organization USB (USB Implementers Forum, USB-IF) officially began to take over and operation of the specification, published a detailed technical documentation to industry hardware manufacturers were able to and so to develop products related to USB 3.0.

   USB 3.0 specification briefly as follows:
4.8Gb per second, providing a higher transmission speed
On the need for greater power to support the device provides better support, maximizing the power supply bus
Added new power management functions
Full-duplex data communications, providing faster speeds
Downward compatible with USB 2.0 devices
  Standard USB 3.0 officially released
By the Intel, Microsoft, Hewlett-Packard, Texas Instruments, NEC, ST-NXP industry giants such as the composition of the USB 3.0 Promoter Group today announced that the organization responsible for developing the USB 3.0 standard interface and next-generation USB 3.0 standard cable samples have been officially completed and open release. The new specification provides ten times the transmission speed of USB 2.0 and higher energy efficiency, can be used in PC peripherals and consumer electronic products.
  Completed development of USB 3.0 standard has been transferred to the specification of the management organization USB Implementers Forum (referred to as USB-IF). The organization will work with hardware vendors to develop support for the new USB 3.0 standard hardware, but the actual product launch we have to wait for some time. 
   USB 1.0 is the first edition appeared in 1996, speed is only 1.5Mbps; two years after the upgrade to USB 1.1, also greatly enhance the speed to 12Mbps, so far part of the old equipment can also see this standard interface; 2000 in April, the widely used USB 2.0 launch, the speed reached 480Mbps, USB 1.1 is four times; the first six months have passed now eight, USB 2.0 speed already unable to meet the application needs, USB 3.0 also emerged maximum bandwidth up to 5.0Gbps, which is 625MB / s, while the use of A-type interface backward compatible.
  IEEE organization recently approved a new standard IEEE1394-2008, but the transmission speed of FireWire version only 3.2Gbps, USB 3.0 is equivalent to 60% more. No wonder Apple and other industry players generally lost interest in the technology.

  USB 2.0 based on half-duplex two-wire bus, can only provide one-way data streaming, and USB 3.0 dual simplex using four-wire differential signal lines, Guer support two-way concurrent data stream transmission, which is the key to the new standard rate of jump reasons.

In addition, USB 3.0 also introduces a new power management mechanisms to support standby, hibernate and pause status.

Measuring instruments maker Tektronix (Tektronix) last month announced the first test tool for USB 3.0, can help developers to verify that the new specification and the compatibility between hardware design. Standard-A type of public ports, port master plan physical simulation

USB 3.0 devices in the actual application will be referred to as "USB SuperSpeed", follow the previous USB 1.1 FullSpeed and USB 2.0 HighSpeed. Expected to support the new specification, commercial controller available in the second half of 2009, consumer products are expected in 2010. [1]
 
The impact of USB 3.0
The 12Mbps upgrade from USB 1.1 to USB 2.0, 480Mbps, 40 times the rise reached, but from the USB 2.0 standard upgrade to USB 3.0 standard is only 10 times, 10 times the speed of the upgrade but has great application significance, since USB 3.0 data transfer rate of 4.8Gbps, far higher than other transmission standards such as IEEE 1394 data transfer is usually between 400Mbps ~ 3.2Gbps, who claims to be "USB mobile hard disk Terminator," a new generation of eSATA standards only 3Gbps data transfer rate.
  USB 3.0 is not so, because the IEEE 1394, eSATA has its own application of positioning, IEEE 1394 standard, its maximum data transfer rate of 3.2Gbps, lag behind in speed USB 3.0, but provides point to point transmission, such PC can be achieved without reliance on data transfer between devices, while supporting both synchronous and asynchronous transfer mode, can connect 63 devices can also transmit digital video and digital audio signals, and recorded in the process of collection and return no signal loss, making IEEE 1394 interfaces more suitable for multimedia devices (such as DV machines, capture card), USB 3.0 standard which are unparalleled. Overall, the application of IEEE 1394 interface, more professional, more free, but precisely because of these professional and manufacturers have not done enough to promote, IEEE 1394 device's popularity is not high, is usually a device also has IEEE 1394 interface and USB interfaces.
  The eSATA standard SATA interface, it is actually an extension, also known as external SATA interface, support plug and play, but there are significant functional limitations, first of all do not support the power supply function, and must meet the board The eSATA interface to use, which means you can not get rid of PC-use restrictions, generally for mobile hard drives, DVD drives and convenient devices such as TV boxes, for the popular consumer digital electronic devices, it becomes useless, and therefore after the release of USB 3.0 standard, eSATA is the competitive pressure faced by the largest transmission standard. Still, we note that due to eSATA SATA chip from the motherboard, so start with a guide function, that is, the computer hard drive or eSATA drive to connect eSATA can start the system, which is a USB drive, USB drive to achieve up more trouble , which for system maintenance, server data under DOS data exchange and its important, but for the general public is, eSATA status and development may be an end.
USB3.0 speed
USB 2.0 to a wide range of devices and applications with sufficient bandwidth, but with the high-definition video, TB (1000GB) storage devices, up to 10 million pixel digital camera, high-capacity mobile phones and the emergence of portable media players, higher bandwidth and transmission speed becomes a must.

Transmission speed of 480Mb per second may have been not fast, not to mention no USB 2.0 devices to achieve this theoretical maximum speeds. In practice, to achieve an average speed of 320Mb per second, already very good.

Similarly, in fact, reach 4.8Gb USB 3.0 as the theoretical value, if only as of the theoretical value of 5 percent, that is 10 times closer to the USB 2.0.

The new "Superspeed USB" than the current 10 times faster USB2.0, USB3.0 specification has entered the final stages of completion. USB Promotion Group Chairman, said Jeff Ravencraft, Superspeed USB's maximum transfer speed of USB 2.0 would be 10 times the minimum transfer speed of 300MB / s. He will bring higher speed flash memory products, using solid-state hard drive, if the interface from the USB2 .0 upgrade to 3.0, then the propeller aircraft to jets that leap. Superspeed USB cable and port will use the backward compatible mode, intel has abandoned the way before the fiber as the transmission interconnection, it is known, this is the cost and the current speed of USB3.0 has reached a "very satisfactory results ", without further development in this area. USB3.0 interface is divided into two parts, and USB2.0 by the same pin; also added a series of electrical signaling interfaces for USB3.0 use. It Ravencraft said, USB3.0 will be officially launched mid next year, and for high-end products, the official product launch in 2010, but there is no doubt that the draft published at the end USB3.0 specification, certainly the first company to compete 3.0 introduced a number of products. [2]
USB 3.0 works
USB 3.0 can become an "excessive speed" performance, fully benefited from improvements in technology. USB 2.0 interface, compared to the current, USB 3.0 more parallel mode to increase the physical bus. USB 3.0 interface, standard size

Can pick up a USB cable around to see the joints. 4 lines in the original structure (power, ground, 2 data) on the basis of, USB 3.0 and then increased by 4 lines, for receiving and transmitting signals. Therefore, it is within or interface cable, a total of 8 lines. It is the additional four (two pairs) line provides the "SuperSpeed USB" support the bandwidth required, to achieve "speeding." Clearly the two USB 2.0 (1 pair) line, is not enough.

In addition, the signal transmission method still uses the host in a controlled manner, but changed to the asynchronous transmission. USB 3.0 using a two-way data transfer mode instead of USB 2.0 times the half-duplex mode. Simply put, the data flow in one direction only need a can, and simplifies the waiting time due to consumption.

In fact, USB 3.0 and did not take any little heard of advanced technology, but in theory, 10 times the bandwidth upgrade. Thus more user-friendly and friendly, once SuperSpeed USB products come out, more people can easily accept and custom made products better.
USB 3.0 to be an advanced
"SuperSpeed USB" to improve much more than the improvement in transfer rate. In USB 3.0, the equipment and computer hosts to more harmonious with, also known as a key research direction. USB 2.0 in succession based on the core architecture, how to use the advantages of dual-bus mode, how to allow users to directly experience than USB 2.0, USB 3.0 advanced, became the focus:

Provide more power when needed

USB 3.0 can provide 50% -80% more power to support those in need of more power-driven equipment, and those who came charging through the USB device, then the signals can be completed faster charging.

The new Powered-B interface, the additional two lines formed, providing support for up to 1000 mA of power. Wireless USB Adapter can drive, but get rid of the traditional USB adapter cable to connect by the need. Usually wired USB devices need to connect to a hub or a computer itself, and the high energy support, would not need a "line" exists.

Do not automatically reduce power consumption when

Switch to USB 3.0, power consumption is also very important to consider an issue, so very necessary and effective power management can guarantee that the equipment to reduce power consumption when idle.

Needs large amount of data streaming support for faster performance, while transmission time, idle equipment can be transferred to the low-power state. Even air down to receive other instructions to complete the other actions.

In fact, USB 3.0 is also not a replacement of everything, such as cable length. When, in some applications need the highest possible throughput, they often still be a bottleneck cable. Although the USB 3.0 specification, not specified how long the USB cable, but the cable material and the signal quality or impact of the transmission effect. Therefore, transfer hundreds of megabytes large data stream, the best cable length should not exceed 3 meters.

In addition, some support the "SuperSpeed USB" hardware products such as hub (hub) may be much more expensive than USB 2.0,, It is like the hub is now active and passive power supply a reason. Because a true "SuperSpeed hub" should have two class interfaces, one to play a real "SuperSpeed hub" role, the other will have to play the role of ordinary high-speed hub.

Network, there are some unofficial comments talked about the USB 3.0 to fiber-optic, in fact, this is the USB specifications organization is Kaolv the question, Ye Xu Hui Zaixia a modified version of the release, may allow some ability for third-party companies to Changshi about . [3]
USB 3.0 products
Related USB 3.0 cable, interface and hub products later in the second half of 2009, when introduced to the consumer to support USB 3.0 devices will follow. The bulk of the peripheral product launch will have to until 2010.

The news from Microsoft is that Microsoft will gradually beginning in 2010 to promote research and development of USB 3.0 devices.

The reason there is no follow-up high-volume manufacturers, mainly related to the development of bus USB 3.0 control chip and equipment products takes time, other manufacturers need to wait for the USB 3.0 specification related to the final fixing, companies can rest assured to the design.

From the prototype to the evaluation version and then to the final development version, to get companies to do R & D has held up his hand and then a certain amount of time, so will not see the first edition appeared overnight out of specification of a universal trend. Degree of market acceptance and adoption of, or need to gradually expanded.
Operating system support for USB 3.0
In November 2008, held, "SuperSpeed" Developer's Conference, Microsoft announced Windows 7 能够 Tigong pair of USB 3.0 to support, but not the version, but later released the Service Pack patch 或者 specific upgrade. Not only Windows 7, or Vista is also likely to support "SuperSpeed", of course, if Microsoft is willing to. At least look at Microsoft's many partners still hope that Vista can support USB 3.0 for.

As Windows XP is still unknown, XP, after all, the product is already 7 years ago, so, support it or not I am afraid that is not so important.

Open source system, Linux support specific USB 3.0, the premise is to extend the host controller interface (xHCI) specification released. Non-public version 0.95, or a pending draft.

Apple area, in accordance with the "custom" is still whether to support the MacOS X "SuperSpeed USB" issues remain silent. However, once honored as USB 3.0 USB 2.0 as "plug and play" market, a lot of "SuperSpeed" equipment will be springing up like normal.

As for the Firewire signal the existence of interference, is not known, but any case, Apple needs to support the "SuperSpeed", if all optimistic about this interface criteria.

At first, the USB 3.0 support, no matter the operating system or device, certainly not in one step. Initially a simple try in the small devices, then there is this kind of problem, and also does not give full play to the advantage of USB 3.0. However, over time, these will be gradually perfected. [4]
USB 3.0 Application
Simply put, all the high-speed USB 2.0 devices will only get USB 3.0 up to better performance, at least not more of the bad.

These devices include:

External hard drive - at least at twice the transmission speed upgrade, not to worry about power shortage problem.

Network of high-resolution camera, video monitor

Video monitor, such as using DisplayLink USB video technology products

USB interface, digital cameras, digital cameras

Blu-ray, etc.

In addition, the most common reader device, especially when the device simultaneously using multiple types of flash memory cards, or card reader connected to the USB Hub on the USB Hub on the reader when there are more than that kind of speed is simply unbearable torture. USB 3.0 provides more space, to solve this problem, providing 5-10 times the bandwidth is not a problem.

Another point that can be expected, in theory, the transmission speed of 4.8Gb per second, enough to make USB invade covers a previously never dared, for example, the disk array system.
USB3.0 Technical Analysis
With Vista, DX10 HD video and the gradual popularization of high-capacity, high-speed data transfer more and more demand for bandwidth is also increasing, the original USB1.1 and USB2.0 are unable to meet future needs. The end of 2007, Intel Corporation and Hewlett-Packard (HP), NEC, NXP Semiconductors and Texas Instruments (Texas Instruments) and other technology companies to develop USB3.0, USB3.0 technology is mainly used in personal computers, consumer and mobile products for rapid synchronization real-time transmission.

Backward compatible with USB 3.0 standard, compatible with USB1.1 and USB2.0 standard USB technology with the traditional ease of use and plug and play functionality. USB3.0 technology goal is to introduce more than 10 times faster than USB2.0 products, using the same architecture with wired USB. In addition to the USB 3.0 specification is optimized to achieve lower power consumption and higher efficiency than the agreements, USB 3.0 port and cable to achieve backward compatibility, and support for future optical transmission.

USB3.0 to adopt a new physical layer using two channels to data transmission (transmission) and confirm (acknowledgement) process dissociation, and thus achieve higher speed. Used to replace the current USB rotation detection (polling) and radio (broadcast) mechanism, the new specification will use packet routing (packet-routing) technology, and only allow the terminal equipment for transmission of data to send when. New link standard to each component will also support multiple data streams, and each data stream can maintain the priority of an independent (separate priority levels), this feature can be used to terminate video transmission caused by jitter interference. Data flow mechanism also inherent in the instruction queue (native command queuing) as possible, thereby enabling optimization of data transfer disk.

Version 2.0 for backward compatibility, USB 3.0 with a 9-pin design, in which four pins and the shape of USB 2.0, definitions are identical, while the other five are prepared specifically for USB 3.0.

Standard USB 3.0 port pin definition of the public, the white sector is dedicated pin USB 2.0 connection, while the red part of the USB 3.0-specific.

Standard USB 3.0 port pin definition of the mother, purple pin to USB 2.0-specific, the red for the dedicated USB 3.0 connection.

USB 3.0 cable, if not knitting (Braid) with the line, total of 8, it is noteworthy that in the cable in, USB 2.0 and 3.0 of the power cord (Power) is common.

Mini USB 3.0 interfaces are divided into A, B are two public port (Plug), while the female population (Receptacle) will have two kinds of AB and B, from the shape of it, AB female port is compatible with A and B are two public ports, 3.0 version of the public port pin 9-pin.