The USB technology that many people see is only the interface and cable, but few people care about the form in which data is transmitted and processed in the USB interface. In today;s desktop and notebook computers, as the host computer, they all contain a host controller. This small chip has a series of logic channels, which are responsible for managing the transmission of various data between the host and the device.
In the USB3.0 specification, it will have its own dedicated data path, dedicated data sending circuit and independent data receiving circuit. Therefore, when data communication is carried out between the host and peripherals, full duplex can be truly realized.
Both the host and the peripheral can send and receive data at the same time. In addition, the data transmission rate will be greatly improved, 5Gb/s data transmission capacity can be achieved, and 4.7Gb/s data throughput can be achieved in each direction.
The new USB interface specification will greatly reduce the type of interface. Prior to this, the USB2.0 specification was very badly defined, and various types of USB2.0 interfaces were flying all over the sky, and the form was very chaotic. The confusing interface names and various transmission rates leave consumers at a loss. When the USB3.0 interface does come, there is only one concept in consumers; minds-this is a truly universal USB interface.
Upgrading from USB 1.1;s 12Mb/s to USB 2.0;s 480Mb/s is a 40-fold increase, while upgrading from the USB 2.0 standard to the USB 3.0 standard is only 10 times, but this 10 times speed increase has a great deal Application significance, since the data transmission rate of USB 3.0 has reached 4.8Gb/s, it is much higher than other transmission standards. For example, the data transmission of IEEE 1394 is usually between 400Mb/s and 3.2Gb/s. At the same time, the new-generation eSATA standard only has a data transfer rate of 3Gb/s. The SATA Association is currently developing a stronger SATA standard, and it is expected that the next-generation SATA interface will reach 6Gb/s. So can the future computer external devices be unified by USB3.0? Or continue the situation of separatist rule?
In fact, despite the astonishing data transfer rate of USB 3.0, USB 3.0 Supplier think the status of other interfaces such as IEEE1394 and eSATA is also difficult to shake. Because their data transmission methods are quite different, at the same time this is destined to have their own characteristics in their application fields.
USB3.0
In USB 3.0, how to cooperate more harmoniously between the device and the computer host is also regarded as a key research direction. On the basis of inheriting the core architecture of USB 2.0, how to take advantage of the dual bus mode and how to enable users to directly experience the advancement of USB 3.0 over USB 2.0 has become the focus.
Can provide more power when needed USB 3.0 can provide 50%-80% more power to support those devices that require more power to drive, and those devices that are charged via USB, it indicates that charging can be completed faster.automatically reduce power consumption and switch to USB 3.0 when it is not needed. Power consumption is also a very important issue to consider. Therefore, effective power management is necessary to ensure that the device is idle to reduce power consumption.
In fact, not everything is updated in USB 3.0, such as the length of the cable. When the highest possible throughput is required in certain applications, cables are often the bottleneck. Although the USB 3.0 specification does not specify how long the USB cable is, the cable material and signal quality still affect the transmission effect. Therefore, when transmitting hundreds of megabytes of data, the cable length should not exceed 3 meters.
In addition, some hardware products that support "SuperSpeed USB", such as hubs, may be much more expensive than USB 2.0. This is like the principle of active power supply hubs and passive power supply. Because a real "SuperSpeed hub" should have two types of interfaces, one is used to play the role of a real "SuperSpeed hub", and the other is to play the role of an ordinary high-speed hub.
Let’s take a look at wireless USB devices. At present, the shipment volume of products using USB 2.0 technology has exceeded 6.2 billion, and the shipment volume last year alone reached 2.1 billion. Among them, the application of wireless USB technology occupies a large proportion, and it can help users free themselves from the complicated cable connection. The data transfer rate of the current wireless USB standard is the same as the current wired USB2.0 standard, both are 480Mbps per second. The difference between the two is that the wireless USB requires a personal computer or peripheral device to be equipped with a wireless transceiver instead of a cable connection . In the future, USB3.0 is compatible with the old version. When USB3.0 technology matures, our wireless USB technology will also be greatly improved.
Let’s look at the impact on Firewire. At the beginning of the USB standard in 1990, the USB1.1 specification for keyboards and mice had a transmission speed of less than 12Mbps, while Firewire locked audio-visual applications such as camcorders with a transmission rate of 100Mbps and above. . However, with the passage of time, USB has been widely used, and the rate has reached the current 2.0 standard of 480Mbps. In contrast, the application of Firewire is far less extensive. The USB3.0 standard is obvious and it is easy to see that it will fully surpass FirewireUSB3.0 camp members that the standard will be able to replace Firewire.
It also pointed out that Firewire has lost many industry supporters, such as Sony has switched to USB2.0 in products such as cameras, and Apple is also planning to switch to high-speed USB interfaces. However, the new Firewire specification is also under development. It will continue to use the same cables and connectors that define the current 1394b standard, but its speed can reach up to 10Gbps. It is foreseeable that the struggle between USB and Firewire will continue. With the advance launch of USB3.0 devices, the advantages of USB will be further expanded. The coexistence of the two interfaces has existed for a long time, and it will be the same in the future. But the prospect of a universal interface is obviously more accepted by users.
There are also hard disk and notebook markets that many people have not considered will also be impacted by high-speed USB3.0 devices. We know that the highest transmission speed of the current hard disk SATA interface is 3Gbs, which is much lower than USB3.0 devices. It may bring about two changes. One is the use of USB to connect hard disk products inside the notebook, and the other is that there are internal failures. For notebook products with hard drives or only solid-state drives and other small-volume, small-capacity hard drives, the main hard drives rely on external USB3.0 interface hard drives. This not only can further reduce the size of the notebook and reduce the heat generation of the notebook, but also can upgrade the notebook hard disk very conveniently.
The advent of USB3.0 has not only brought us an increase in the transmission speed of unilateral products, but has also contributed to the improvement and development of the entire industry.
