Competitors of usb3.0

Upgrade from 12 Mb/s of USB 1.1 to 2.0 Mb/s of USB 480.40 timesAnd upgrade from USB 2.0 standard to USB 3.0 standard only10 timesHowever, this 10-fold speed improvement has a great application significance. Since the data transmission rate of USB 3.0 has reached 4.8 Gb/s, it is far higher than other transmission standards, for example, the IEEE 1394 data transmission is usually 400 Mb/s ~ 3.2 Gb/s. At the same time, the new generation esata standard only has 3 Gbit/s data transmission rate. At present, the SATA Association is still developing a stronger SATA standard, and the next generation SATA interface is expected to reach 6 Gb/s. So can the external computer devices be unified by usb3.0 in the future? Or are we continuing to cut data?

In fact, although the data transmission rate of usb3.0 is so amazing, the author thinks that the status of other interfaces such as ieee1394 and esata is also hard to shake. Because of their large differences in data transmission methods, it is doomed that their application fields have their own characteristics. Maybe the next generation of usb3.0 and esata can fight against external hard disks. But between native SATA SignalEsata, inDisk control and data error toleranceAndTransmission RateIt is much better than usb3.0.. In addition, esata has startedPopularity on the motherboardAnd esata, Which is preemptible, has unique advantages.

Additionally, ieee1394 has a maximum data transmission rate of 3.2 Gbps, which lags behind USB 3.0 in terms of speed. However, it provides point-to-point transmission.Data transmission between devices without relying on PCsSupports both synchronous and asynchronous transmission modes. You can connect 63 devices to transmit digital videos and audio signals at the same time, and there is no signal loss during the collection and recording.The IEEE 1394 Interface is more suitable for multimedia devices.(Such as DVRs and acquisition cards ). Therefore, these specific fields still have strong vitality.

 

Usb3.0 standards

At present, usb3.0 can be basically determined to be launched in 2009. As the next generation high-speed connection Standard, the data transmission rate of usb3.0 can reach 10 times of the widely used USB2.0, that is, 5 Gbps. It can be between 60 and ~ Transfer a 27 gb hd movie in 70 seconds. So how does it achieve this speed?

Usb3.0 will adopt a new physical layer.Two channelsData Transmission(Transmission) andAcknowledgement)Process SeparationAnd thus reach a high speed.

To replace the existing USBPolling)AndBroadcast Mechanism, The new specification will adoptPacket-Routing TechnologyAnd only allows the terminal device to transmit data.

The new link standards will also support each componentMultiple Data StreamsAnd every data stream can be maintained.Independent priority(Separate priority levels); this function can be used during video transmission.Terminate jitters.. The transmission mechanism of data streams also makes nativecommand queuing possible, which can optimize data transmission on hard disks. The upload and download of final data use different channels, and even parallel operations will not affect each other.

The USB 3.0 interface is divided into two types: A and B, while the mother port will have two types: B and AB. 3 from the shape, the AB primary port can be compatible with public ports A and B. In order to be backward compatible with version 2.0, USB 2.0 adopts 9-Pin Design. Four of the four pins have the same shape and definition as USB, and the other five are specially prepared for USB. This is a combo solution.

The pins of the standard USB 3.0 public port are defined. The white section is dedicated to USB 2.0 connections, while the red section is dedicated to USB 3.0. The pins of the standard USB 3.0 mother port are defined. The Purple pins are dedicated to USB 2.0, and the red is dedicated to USB 3.0 connections.

If the cross section of the USB 2.0 cable is not counted as a series (braid) cable, there are 8 cables in total. It is worth noting that the power cables of USB 3.0 and are shared.

At present, Intel has tested the basic version of the new protocol at 5 Gbps and 25 Gbps through software simulation. Finally, this link standard has no media restrictions (mediaagnostic ), it will be executed on copper wires and optical fiber cables. In addition, the members of the Promotion Team are still discussing how to break through the power supply limit of USB port 500mA. The current will increase from 100mA to 900mA, which will be able to charge more mobile devices, and the speed will be faster. At the beginning, usb3.0 should appear in the form of an independent chip, and eventually it will be integrated into the chipset. Of course, at the same time, USB can also be backward compatible with USB and USB specifications. It may be the final practice to integrate into the Motherboard chipset, but whether Intel will charge the corresponding fees depends on the market strategy and the vendor's fight results.