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 USB Micro-AB Socket OTG

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meodingu

meodingu


Posts : 201
Join date : 2010-09-30

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PostSubject: USB Micro-AB Socket OTG    USB Micro-AB Socket OTG  I_icon_minitimeMon 10 Jan 2011, 3:20 pm


USB Micro-AB Socket OTG
Main article: USB On-The-Go
An OTG device is required to have one, and only one USB connector: a Micro-AB receptacle as defined in [Micro-USB1.01]. This receptacle is capable of accepting either a Micro-A plug or a Micro-B plug attached to any of the legal cables and adapters defined in [Micro-USB1.01].
The OTG device with the A-plug inserted is called the A-device and is responsible for powering the USB interface when required and by default assumes the role of host. The OTG device with the B-plug inserted is called the B-device and by default assumes the role of peripheral. An OTG device with no plug inserted defaults to acting as a B-device. If an application on the B-device requires the role of host, then the HNP protocol is used to temporarily transfer the host role to the B-device.
OTG devices attached either to a peripheral-only B-device or a standard/embedded host will have their role fixed by the cable since in these scenarios it is only possible to attach the cable one way around.

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sangbmt




Posts : 36
Join date : 2011-01-04

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PostSubject: Re: USB Micro-AB Socket OTG    USB Micro-AB Socket OTG  I_icon_minitimeWed 12 Jan 2011, 5:02 am

The OTG device with the A-plug inserted is called the A-device and is responsible for powering the USB interface when required and by default assumes the role of host. The OTG device with the B-plug inserted is called the B-device and by default assumes the role of peripheral. An OTG device with no plug inserted defaults to acting as a B-device. If an application on the B-device requires the role of host, then the HNP protocol is used to temporarily transfer the host role to the B-device.
OTG devices attached either to a peripheral-only B-device or a standard/embedded host will have their role fixed by the cable since in these scenarios it is only possible to attach the cable one way around.
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