The AT43311 is a fully compliant USB hub chip with 5 ports, one upstream port and four full/low-speed downstream ports. The AT43311 can be used as a stand alone or can provide a simple and quick method of adding USB ports to an existing device. As a repeater, the AT43311 provides upstream connectivity between the selected function and the host. Connectivity involves setting up and tearing down connections, handling bus faults, recovering from bus faults and detecting downstream device connections and disconnections. The AT43311 may also act as a hub controller managing the hub operations and recording the status of the hub, bus transactions, and downstream ports. In this mode, the AT43311 tracks and generates the bus enumeration, provides configuration information to the host, provides individual port status to the host, and controls the port operation based on host commands.