Can someone explain the USB tree in Device Manager?

This is a discussion on Can someone explain the USB tree in Device Manager? within the Tech Board forums, part of the Community Boards category; I understand that my USB ports are connected by a USB Bus to a USB Root Hub. The USB Root ...

  1. #1
    Set Apart -- jrahhali's Avatar
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    Can someone explain the USB tree in Device Manager?

    I understand that my USB ports are connected by a USB Bus to a USB Root Hub. The USB Root Hub is controlled by my USB Host Controller which is integrated into my chipset. If my chipset can use more than one USB standard, like 1.1 and 2.0 for example, than those two Host Controllers share the same Root Hub so you can plug in a device at any port, and have it function as 1.1 or 2.0.

    I have three USB ports on my computer. Device Manager lists this:

    Universal Serial Bus Controllers:
    Standard Enhanced PCI to USB Host Controller
    Standard OpenHDC USB Host Controller
    Standard OpenHDC USB Host Controller
    USB Root Hub
    USB Root Hub
    USB Root Hub

    I've read that OpenHCD refers to USB 1.1 and Enhanced is 2.0

    If my understanding is correct in the ONE host controller controls ONE root hub, then why does device manager list TWO 1.1 host controllers, ONE 2.0 host controller, and THREE USB root hubs?
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  2. #2
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    Code:
    Standard Enhanced PCI to USB Host Controller   <--- Intreface between host controllers and computer PCI buss
    Standard OpenHDC USB Host Controller       <-- USB "controller" #1
    Standard OpenHDC USB Host Controller       <-- USB "controller" #2
    USB Root Hub                  <--- USB Ports as 3 sets of 4
    USB Root Hub
    USB Root Hub

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