Features of USB:
1. Up to 127 different devices can be connected on a single USB bus.
2. Initial USB standard supported 12 Mbps transfer rate. Currently 60 Mbps is supported.
3.Supports wide range of peripherals such as keyboard, mouse, printer, FDD, game pad, joystick etc.
4. Devices are not daisy chained. Each device is connected to USB hub, which is an intelligent device interacting with the PC on oneside and USB peripheral devices on the other side.
5. A USB device can be connected without powering off the PC. The plug and play feature in the BIOS together with intelligence in the USB device takes care of detection, device recognition and handling.
6. USB controller in the PC detects the presence or absence of USB devices and does power allocation.
7. The CPU/software initiates every transaction on the USB bus. Hence the overhead on the PC software increases.
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