Active USB device
First Claim
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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.
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Abstract
The embodiment of the present invention provides an USB device that can be directly connected to another USB device to allow data exchange to take place without involving a use of a computer. Further, the embodiment of the invention also exploits a MP3 codec to allow voice data to be played or recorded via the USB device of the embodiment of the invention.
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Citations
17 Claims
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1. A data-exchangeable universal serial bus (USB) device that accesses another USB device directly to store or retrieve data, comprises:
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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; anda 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A data-exchangeable USB device that is directly connected to another USB device so that data is exchanged between each other, which comprises:
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a function module, controlled by a user, for operating at a device mode or a host mode, and outputting a mode signal; and an USB interface module, electrically connected to the function module and the another USB device, comprising a first switch, a second switch, and a third switch, in which the first switch is electrically connected to a D+ signal line of an USB interface and a high voltage level, the second switch is electrically connected to the D+ signal line of the USB interface and a ground reference, and the third switch electrically connected to a D−
signal line of the USB interface and the ground reference;
further, according to the mode signal, the USB interface module operates accordingly that is when the function module operates at the host mode, the first switch is turned off and the second and third switches are turned on, and when the function module operates at the device mode, the first switch is turned on and the second and third switches are turned off. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification