Abstract: The present invention discloses a universal serial bus (USB) control circuit, and more particularly, a USB control circuit with an automatic route-switching function.

Abstract: A USB controlling apparatus for data transfer between computers and method for the same are provided. The apparatus comprises a host controller providing a host function of USB interface; a device function circuit providing a device function of USB interface; at least one connection for connecting to a USB device or a USB cable by way of data transfer; and a path switch unit. The path switch unit connected to the host controller, device function circuit and the USB data lines, used to switch a connection path of the USB data lines between the host controller and the device function circuit, which is able to provide a host function mode to connect USB apparatus for data transmitting or a device function mode to connect with other computer host for data transmitting.

Abstract: A chip test method is suitable for testing a universal serial bus host controller. First, the host controller and the client device are individually set in a test mode. Next, the client device performs a client-side test preparation action. In addition, the host controller performs a host-side test preparation action. The host controller sequentially outputs a number of requests to the client device. The client device, in response to the requests, outputs simulated responses individually to the host controller, wherein the simulated responses are selected from correct responses corresponding to the requests, possible faulty responses, and error responses that are possibly to be received by the host controller during actual operation. Finally, the host controller performs a verification test to verify whether the host controller works properly under the various simulated situations.

Abstract: The present invention discloses a universal serial bus (USB) control circuit, and more particularly, a USB control circuit with an automatic route-switching function.

Abstract: A control method of maintaining data integrity throughout transmission is provided. Firstly, a parameter value according to the value of a packet size of a packet is generated. The parameter value equals to the value of the packet size multiplied by a first value and added by a second value, and the denominator of the first value is a value of 2 to the power of an integer. Then, it is determined whether the parameter value is greater than a byte times left in a frame. If it is not, the packet can be transmitted. The invention can achieve purposes of less bandwidth, less cost, and simple circuit design.