![]() It also has an engine (root hub) that performs essential part of the car functionality. It has an interface (pedals) that software (driver) can use to operate the controller. Here is a simple analogue to illustrate to relationships:Ī vehicle is a controller. Basically they are registers that software can access in order to communicate with host controller.įrom the above I don't think term "middleman" is applicable as you pictured it. ![]() interfaces of host controller, not root hub. The interfaces that you mention are Host Controller Interfaces (HCI), i.e. More specifically, it is a part of host controller (which itself can be either separate chip or a part of chipset). ![]() It might be more convenient to think of root hub as one of the several starting points for enumeration. You can have more than one root hub, so no, it is not the point where all hubs come together.
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