USB connector development application history

USB connector development application history

2019-02-01 16:38:47

      

USB connector development application history

USB is an interface that standardizes and simplifies the connection of computer peripheral devices. Its specifications are from Intel, Intel Corporation, Compaq, DEC, Digital Devices, and International Business. Machine company), Microsoft (Microsoft), Northern Telecom (Northern Telecom) jointly developed.

The USB1.1 standard interface has a transmission rate of 12 Mbps, but a USB device can only get a transmission bandwidth of up to 6 Mbps. Therefore, if you want to connect an external optical drive, you can connect to a six-speed optical drive at most. If you want to play MPEG-1 VCD movies instantly, you need at least 1.5Mbps transmission bandwidth. This is done by USB, but to complete the MPEG-2 DVD movie playback with four times the amount of data, USB may be very difficult. With the AC-3 audio data, USB devices are difficult to achieve instant playback.

What is the Chinese name of the USB connector? USB connector development application history
A USB interface can theoretically support 127 devices, but this number is not yet available. In fact, for a computer, there are rarely more than 10 peripherals connected, so this number is enough for us to use.

Another significant advantage of USB is that it supports hot swapping. In other words, you can safely connect or disconnect USB devices when booting up to achieve true plug and play.

 

 

In the 1970s, although USB devices have been widely used, the USB 2.0 interface is more common, and its transmission speed is 480 Mbps.

USB2.0 is compatible with USB1.1, which means that USB1.1 devices can be used with USB2.0 devices, but USB2.0 devices can only work at full speed (12Mbit/s). USB2.0 has three working speeds: high speed, full speed and low speed. The high speed is 480 Mbit/s, the full speed is 12 Mbit/s, and the low speed is 1.5 Mbit/s. Full speed and low speed are designed to be compatible with earlier devices that only work on USB 1.1 or USB 1.0. The USB bus is a one-way bus. The main controller is on a PC, and the USB device cannot actively communicate with the PC. In order to solve the problem of USB device mutual communication, the relevant manufacturers have developed the USB OTG standard, which allows the embedded system to communicate with each other through the USB interface, thereby eliminating the PC.

What is the Chinese name of the USB connector? USB connector development application history
The new USB 2.0 specification in the 1910s renamed the USB standard to change the original USB 1.1 to USB 1.1 Full Speed ​​and changed the original USB 2.0 to USB 2.0 High-Speed. High speed version).

USB 3.0 is the latest USB specification in the 1910s, which was initiated by major companies such as Intel.

What is the Chinese name of the USB connector? USB connector development application history
USB 3.0 - also known as SuperSpeed ​​USB - provides a standard interface for a variety of devices connected to PCs or audio/high-frequency devices. From keyboards to high-throughput disk drives, devices can use this low-cost interface for smooth, plug-and-play connectivity, so users don't have to worry too much about it. The new USB 3.0 offers several enhancements while maintaining compatibility with USB 2.0:

1. Greatly improved transmission bandwidth - theoretical up to 5Gbps full duplex (USB2.0 theoretical maximum is 480Mbps half duplex)

2. Achieve better power management

3. Enables the host to provide more power to the device for USB—rechargeable batteries, LED lighting, and mini-fans.

4. Enables the host to recognize the device faster

5. The new protocol makes data processing more efficient

USB 3.0 can transfer large files (such as HD movies) at the storage rate defined by the storage device. For example, a USB 3.0 flash drive can transfer 1GB of data to a host in 15 seconds, while USB 2.0 takes 43 seconds.

When used in consumer devices, USB 3.0 will solve the problem that USB 2.0 does not recognize batteryless devices. The host can slowly reduce the current through USB 3.0 to identify these devices, such as those with a broken battery.

For system and ASIC developers, the wide availability of USB 3.0 chips and IP ensures that every design requirement can be met in a timely manner. This omni-directional support is especially important for standards like USB 3.0, because speed, advanced protocols, and various cable lengths (from a few inches to a few meters) make design and standard compatibility a challenge.

SATA and USB In the past few years, USB, eSATA and Firewire have achieved a lot of achievements in the field of personal computers in the field of competing for external memory interfaces. At this point, Serial ATA (SATA) replaces all other interfaces in the internal drive connectivity of consumer PCs. Although the new Compactflash version called CFast will be built on SATA, the earlier Parallel ATA (PATA) continues to be used in industrial and embedded applications that use CompactFlash as a storage medium.

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