Tip: Analyze the USB interface
USB is the abbreviation of Universal Serial Bus, which means "Universal Serial Bus" in Chinese. It is not a new PCI but a new interface technology for PCS. There have been PCS with USB ports since 1995, but the lack of software and hardware support has left them unused. After 1998, with Microsoft's built-in support module for USB interface in Windows 98, and the increasing number of USB devices, USB interface gradually entered the practical stage.
USB USES a 4-pin plug as the standard plug. With this standard plug, all peripherals can be connected in Daisy chain form without loss of bandwidth. The USB standard divides USB into five parts: controller, controller driver, USB chip driver, USB device, and customer driver for different USB devices.
USB requires the support of host hardware, operating system and peripherals to work. At present, the motherboard generally USES the control chipset which supports USB function, and also installs the USB interface slot. USB support is built into Windows 98 and above (but Windows NT doesn't support USB yet). There are already digital cameras, digital speakers, scanners, keyboards, mice and many other USB peripherals.
With the popularity of a large number of PERSONAL computers that support USB, IT is an inevitable trend that USB gradually becomes the standard interface of PC. While almost all of the new PCS support USB, devices using USB ports are also evolving at an amazing rate. We currently use the USB1.1 standard interface, which has a transmission speed of 12Mbps.
USB 2.0 standard
COMPAQ, Hewlett Packard, Intel, Lucent, Microsoft, NEC and PHILIPS jointly developed the USB 2.0 interface standard. USB 2.0 the speed of data transmission between devices has increased to 480 MBPS, around 40 times faster than USB 1.1 standard, the advantage of the speed of increase for the user is means that the user can use to better external devices, and has a variety of speed of peripheral devices can be connected to the USB 2.0 lines, unlike USB 1.1 times, because of the high bandwidth makes more devices without having to worry about data transmission bottleneck effect. USB 2.0 can use the same specifications of cables in the original USB definition, and the connector specifications are the same, maintaining the same FEATURES of USB 1.1 at high speed and ensuring downward compatibility.