Patent ID: 7600066

Claim:
A method for identifying bridge devices, comprising: receiving an undefined command by a bridge device from a host controller, wherein the undefined command is undefined to the bridge device or a standard interface device; transmitting the undefined command to the standard interface device by the bridge device; performing the undefined command by the standard interface device to generate output information comprising at least one specific parameter in response to the undefined command, wherein the specific parameter has an any value; transmitting the output information to the bridge device by the standard interface device; setting the specific parameter in the output information from the any value to a specific value by the bridge device; transmitting the output information that has been set by the bridge device to the host controller by the bridge device; identifying the bridge device by the host controller or an application according to the output information that has been set by the bridge device by determining whether the specific value of the specific parameter matches a predetermined value of a specific supported bridge device.