USB On-The-Go Basics - Maxim > App Notes > Interface Circuits Keywords USB OTG OTG USB on the go dual role device host negotiation protocol session

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Maxim > App Notes > Interface Circuits Keywords: USB OTG, OTG, USB on the go, dual role device, host negotiation protocol, session request protocol, host, peripheral, transceiver Dec 20, 2002 APPLICATION NOTE 1822 USB On-The-Go Basics Abstract: USB On-The-Go (OTG) allows two USB devices to talk to each other without requiring the services of a personal computer. Although OTG appears to add "peer to peer" connections to USB, it does not. Instead, USB OTG retains the standard USB host/peripheral model, where a single host talks to USB peripherals. OTG introduces the dual-role device (DRD), capable of functioning as either host or peripheral. Part of the magic of OTG is that a host and peripheral can exchange roles if necessary. Before OTG, the concept of an embedded host was already established in the USB world. Instead of duplicating the full UHCI/OHCI USB controllers and drivers built into personal computers, most embedded host chips provide limited hosting capabilities. This makes them better suited to the embedded environment than to the PC with its huge resources and infinite capacity for drivers and application software. Introduction USB On-The-Go (OTG) allows two USB devices to talk to each other without requiring the services of a personal computer (PC). Although OTG appears to add peer-to-peer connections to the USB world, it does not. Instead, USB OTG retains the standard USB host/peripheral model, in which a single host talks to USB peripherals. OTG does introduce, however, the dual-role device, or simply stated, a device capable of functioning as either host or peripheral. Part of the magic of OTG is that a host and peripheral can exchange roles if necessary. Before OTG, the concept of an embedded host was already established in the USB world. Instead of duplicating the full UHCI/OHCI USB controllers and drivers built into PCs, most embedded host chips provide limited hosting capabilities. This makes them better suited to the embedded environment than a PC with its huge resources and infinite capacity for drivers and application software. An OTG device may, or may not be capable of functioning as a host. It is likely, nonetheless, that most OTG devices will be dual-role. USB Peripherals
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This note was uploaded on 02/04/2012 for the course ECON 101 taught by Professor Gulipektunc during the Spring '11 term at Middle East Technical University.

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USB On-The-Go Basics - Maxim > App Notes > Interface Circuits Keywords USB OTG OTG USB on the go dual role device host negotiation protocol session

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