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Where do I get the spec for USB, EHCI or a device class?

April 26, 2017class device ehci Spec USB

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Where do I get the spec for USB, EHCI or a device class?

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The documents page provides links to the USB spec itself, host controller specifications and the device class specifications. The EHCI specification, version 1.0 can be downloaded at EHCI spec (1.0), The device class specifications are listed at—and can be downloaded from— device class specs.