13 Mar '13, 1am

What’s The Difference Between USB 2.0 And 3.0 Hubs? via @ElectronicDesgn @renesasamerica #usb

What’s The Difference Between USB 2.0 And 3.0 Hubs? via @ElectronicDesgn @renesasamerica #usb

In general, a bus driver and/or higher-level driver running on the host CPU implements the overall power management strategy for the USB topology, such as when to put any part of the USB topology into a reduced power state and how deeply to reduce its power, depending on the resume latency that might be needed. For instance, a fully unpowered device generally will need a complete USB hardware reset (using specified USB signaling in USB 2.0, or “polling.LFPS” in USB 3.0) and re-initialization to become operational again. That is likely to be too time consuming for users who are trying to utilize their device and the system is only trying to prolong the useful operational battery time. In this case, software drivers can detect what level of usage is occurring and determine a suitable tradeoff between power savings and quick responsiveness as seen by the user.

Full article: http://electronicdesign.com/embedded/what-s-difference-be...

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