Compound device
A USB compound device contains an embedded USB hub and one or more non-removable USB devices. It may or may not have exposed downstream ports. The internal USB hub may be a physical IC that connects to other ICs, or the hub and all functions may be implemented in software on a single IC (though it is more common to integrate them as a in this case). Compound devices have separate device addresses assigned to the hub and each downstream function, while composite devices have a single address. The hub's indicate whether it is part of a compound device or a regular hub with only removable devices.
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Compound device
A USB compound device contains an embedded USB hub and one or more non-removable USB devices. It may or may not have exposed downstream ports. The internal USB hub may be a physical IC that connects to other ICs, or the hub and all functions may be implemented in software on a single IC (though it is more common to integrate them as a in this case). Compound devices have separate device addresses assigned to the hub and each downstream function, while composite devices have a single address. The hub's indicate whether it is part of a compound device or a regular hub with only removable devices.
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A USB compound device contains ...... which have memory card slots.
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A USB compound device contains ...... b with only removable devices.
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Compound device
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