The interfaces that you mention are Host Controller Interfaces (HCI), i.e. Venta > amd usb 3.1 extensible host controller driver. Topic: USB 3 eXtensible Host Controller AskWoody. More specifically, it is a part of host controller (which itself can be either separate chip or a part of chipset).USB 3.00 and USB 3.10 Driver - AMD Community. Is it related)Root hub is a piece of hardware. I also have NVIDIA USB 3.10 extensible host controller and NVIDIA USB Type-C Port Policy Controller.
Amd Usb 3.10 Extensible Host Controller Software Usually Has
This is sort-of illustrated in the following Microsoft documentation.Where the circled layer, I believe, provides this port status translation.After that the system knows no difference between a root hub port and any regular hub port. This is a piece of hardware.However, to maintain bit-wise compatibility between ALL ports in USB tree and provide universal access to all ports, the host controller driver software usually has a special layer that converts the register-based port control statuses (PORTSC) into standard USB port status format. This protocol works up to any valid level of hub stackup, and each port has well-defined status bits within USB responses.A root hub performs similar function, except (a) the upstream is associated directly with host controller pipe/bus, and (b) various status bits of each ports are mapped directly into 32-bit registers in host PCI space. These functions are controlled via USB-type control transactions, which are directed to each particular port, all using USB packet-token protocol. To do so, each hub has special control pipe that controls port functions such as connect/disconnect/suspend/resume/disable etc.
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