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Additional info for USB specification.Rev 2.0
The USB full-speed signaling bit rate is 12 Mb/s. 5 Mb/s. 0 host controllers and hubs provide capabilities so that full-speed and low-speed data can be transmitted at high-speed between the host controller and the hub, but transmitted between the hub and the device at full-speed or low-speed. This capability minimizes the impact that full-speed and low-speed devices have upon the bandwidth available for high-speed devices. The low-speed mode is defined to support a limited number of low-bandwidth devices, such as mice, because more general use would degrade bus utilization.
Request A request made to a USB device contained within the data portion of a SETUP packet. Retire The action of completing service for a transfer and notifying the appropriate software client of the completion. Root Hub A USB hub directly attached to the Host Controller. This hub (tier 1) is attached to the host. Root Port The downstream port on a Root Hub. Sample The smallest unit of data on which an endpoint operates; a property of an endpoint. Sample Rate (Fs) The number of samples per second, expressed in Hertz (Hz).
Additionally, pipes have associations of data bandwidth, transfer service type, and endpoint characteristics like directionality and buffer sizes. Most pipes come into existence when a USB device is configured. One message pipe, the Default Control Pipe, always exists once a device is powered, in order to provide access to the device’s configuration, status, and control information. The transaction schedule allows flow control for some stream pipes. At the hardware level, this prevents buffers from underrun or overrun situations by using a NAK handshake to throttle the data rate.
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