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seattleslow
searching PlanetScale…
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by
seattleslow
17y ago
Each USB device has a set of descriptors to describe itself and its supported capabilties. The amount of current required by a device (from the cable) is provided in the configuration descriptor. For example, a device could have two confi
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by
seattleslow
17y ago
A few points to clarify. In USB 2.0 and earlier, there are two kinds of hubs: self-powered and bus-powered. Self-powered hubs must provide 500 ma at each downstream port. Bus-powered hubs must provide 100 ma at each downstream port. Ther