The development history of USB interface

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The development history of USB interface

USB interface USB 1.0

USB 1.0 appeared in 1996 at a speed of only 1.5Mb/s (bits per second); in 1998 it was upgraded to USB 1.1, and the speed was greatly increased to 12Mb/s.

USB1.1 is a relatively common USB specification. Its high-speed mode has a transmission rate of 12 Mbps, and the low-speed mode has a transmission rate of 1.5 Mbps (b is the meaning of Bit). b/s generally indicates the bit transmission speed, and bps indicates the bit transmission rate. Numerically equal. B/s and b/s, BPS (bytes per second) and bps (bits per second) cannot be confused. 1MB/s (megabytes/second) = 8Mbps (megabits per second), 12Mbps = 1.5MB/s, and most MP3s are of this type. [3]

USB interface USB 2.0

The USB 2.0 specification evolved from the USB 1.1 specification. Its transmission rate reaches 480Mbps, which translates to 60MB/s MB, which is enough to meet the speed requirements of most peripherals. The Enhanced Host Controller Interface (EHCI) in USB 2.0 defines an architecture that is compatible with USB 1.1. It can drive USB 1.1 devices with a USB 2.0 driver. In other words, all devices that support USB 1.1 can be used directly on the USB 2.0 interface without worrying about compatibility issues, and accessories such as USB cables, plugs, etc. can be used directly.

The change brought about by the use of USB for printer applications is a significant increase in speed. The USB interface provides a connection speed of 12 Mbps, which is 10 times higher than the parallel port speed. At this speed, the file transfer time is greatly reduced. The USB 2.0 standard further increases the interface speed to 480 Mbps, which is 20 times faster than normal USB speeds, and significantly reduces the transfer time of print files.

USB interface USB 3.0

The USB 3.0 Promoter Group, which consists of Intel, Microsoft, Hewlett-Packard, Texas Instruments, NEC, and ST-NXP, announced that the next-generation USB 3.0 standard that the organization is responsible for has been officially completed and released. The theoretical speed of USB 3.0 is 5.0Gb/s, which can only reach 50% of the theoretical value, which is close to 10 times that of USB 2.0. The physical layer of USB3.0 adopts 8b/10b encoding mode, so the theoretical speed calculated is 4Gb/s, and the actual speed is deducted from the protocol overhead, and there are fewer points on the basis of 4Gb/s. Can be widely used in PC peripherals and consumer electronics.

USB 3.0 will be referred to as "USB SuperSpeed" in real-world device applications, compliant with previous USB 1.1 FullSpeed and USB 2.0 HighSpeed. Commercial controllers supporting the new specification are expected to be available in the second half of 2009, and consumer products are already available.