| 摘要 |
A USB device for decreasing the current at load is provided. The USB device comprises a Client USB device, having a client functional module electronically connected to a client USB controller, connected to an Improved-USB bus and a client USB Physical Layer individually, wherein the client USB Physical Layer is further connected to a Standard-USB bus. Through this Standard-USB bus, the Client USB device is connected to a host USB Physical Layer of an external host. On the other hand, via the Improved-USB bus, the Client USB device is connected to an external host without host USB Physical Layer. Because both of the Client USB device and the external host have the option of using the Improved-USB bus, hence their Physical Layers being removed or idled.
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