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The USB host controller has an embedded hub called the root hub. The ports that are visible at the system's back panel are the ports of the root hub. The USB host controller is responsible for the following: Directing the USB bus. Individual devices cannot arbitrate for the bus. Polling the devices by using a polling interval that is determined by the device. The device is assumed to have sufficient buffering to account for the time between the polls.
1 Host Controller Interface (USB), an interface that enables a USB host controller to communicate with a driver. 2  Host Controller Interface (Bluetooth) in Bluetooth protocols.  Host Controller Interface (non-volatile memory), an interface that enables SATA Express / NVM Express SSDs to communicate with a driver.