DUAL-ROLE COMPATIBLE USB HUB DEVICE AND METHOD

摘要

A Universal Serial Bus hub apparatus (102) and method is disclosed that is compatible with the On-the-Go (OTG) supplement to the USB 2.0 specification so as to enable dual-role devices (OTG devices) to be connected via a hub. The hub includes a number of ports (202) that are configured to connect the hub to one or more external devices, which may include OTG devices. A controller within the hub controls operations therein. The hub also includes a port switching (200) device controlled by the controller for selectively allowing one of the number of ports to act as a host port and the other remaining ports to act as device ports.