USB for Portable Devices FINAL Universal Serial （用于便携设备的USB通用串行）.pdf

1 USB for Portable Devices USB for Portable Devices 2 USB for Desktops USB for Desktops USB was first introduced as a solution to desktop interconnectivity USB was first introduced as a solution to desktop interconnectivity At the time, desktops had a number of different wired interfaces At the time, desktops had a number of different wired interfaces – Printer, mouse, keyboard, serial, parallel, PS2 – Printer, mouse, keyboard, serial, parallel, PS2 USB was very successful in replacing these wired interface ports, USB was very successful in replacing these wired interface ports, and has now become the de facto industry standard and has now become the de facto industry standard The success of USB in the desktop space has caused a number of The success of USB in the desktop space has caused a number of portable devices to also adopt USB portable devices to also adopt USB 3 USB for Portable Devices USB for Portable Devices Virtually every portable device now uses USB for PC connectivity Virtually every portable device now uses USB for PC connectivity USB-IF is now expanding the functionality of USB in a portable USB-IF is now expanding the functionality of USB in a portable device to include features like: device to include features like: – Charging – Charging – Host – Host – Headset – Headset – Video – Video The USB-IF is committed to addressing new requirements for The USB-IF is committed to addressing new requirements for portable device interfaces as they emerge portable device interfaces as they emerge 4 USB-IF Initiatives for Porta