Patent ID: 6996636
Filing Date: 2006-02-07
Classification: G06F

Abstract:
1. A data-exchangeable universal serial bus (USB) device that accesses another USB device directly to store or retrieve data, comprises: an USB interface module, comprising: a first switch electrically connected to a D+ signal line of an USB interface at one terminal and to a high voltage level at another terminal, a second switch electrically connected to the D+ signal line of the USB interface at one terminal and to a ground reference at another terminal, and a third switch electrically connected to a D− signal line of the USB interface at one terminal and to the ground reference at another terminal, wherein the first switch is turned off and the second and third switches are turned on when the another USB device operates at a device mode, and the first switch is turned on and the second and third switches are turned off when the another USB device operates at a host mode; and a function module, electrically connected to the USB interface module, which further comprises a mass storage device for storing data, and automatically accessing a storage of the another USB device operating at the device mode.