Device Qualifier Descriptor in dscr.a51

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    Question: What is the need for Device Qualifier Descriptor in dscr.a51?



    The device_qualifier descriptor describes information about a high-speed capable device that would change if the device were operating at the other speed. For example, if the device is currently operating at full-speed, the device_qualifier returns information about how it would operate at high-speed and vice-versa. For more details refer section 9.6.2 of USB 2.0 Specification