Re: USB host controllers

OK - Here is how to view Device to Hub to Controller connects.

Open Device Manager, Click View - Toggle setting to "View
Devices by Connection". Then expand the tree as follows:
-ACPI 'YourType' PC
-Microsoft ACPI Compliant System
-PCI Bus
Expand each USB Controller to see it's HUB and connected USB
Devices.


"bxf" <bill@xxxxxxxxxx> wrote in message
news:1122919654.834523.54120@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> R. McCarty wrote:
>> Each "Physical" Port ( Socket ) works through a transceiver that
>> has interconnections between the Enhanced Controller and the
>> standard controllers. So all USB 2 devices will show up in the
>> "Advanced" (TAB) of the Enhanced Controller. Any USB1/1.1
>> Devices will appear in the Host Controller properties.
>>
>> So you can't really map USB2.0 devices to a physical port, they
>> all route to the same Host Controller.
>>
>> But you can do that by using USB1 (Full Speed) devices since
>> they'll appear on their respective Host Controllers Advanced
>> details box.
>>
>> My Intel 865 motherboard has 8 Ports and in Device Manager
>> I've got 1 Enhanced and 4 Low speed Controllers.
>>
>> A little bit confusing, isn't it
>
> Somewhat, but manageable. The USB2/EHCI part is simple enough. What
> complicates things a bit is that there are multiple "logical" ports
> associated with each controller. As you point out, you have 8 physical
> ports but only 4+1 controllers. I think, though I haven't actually
> counted, that the total number of ports showing under all controllers
> exceeds the number of physical ports I have, so what's the
> relationship?
>
> This subject is related to my feeble attempt to distribute the activity
> of my USB devices across ports (as shown in Device Manager). I have a
> USB2 TV tuner, whose power requirements exceed the single port "limit"
> of 500ma (it is in fact supplied with a second USB connection just to
> obtain the additional power, though I don't need to use it on my
> laptop), plus a USB2 DVD drive, plus a USB2 HDD and occasionally a
> second HDD. All these together surely exceed the 500ma that a USB2 port
> is expected to supply, and yet it works, without even using the second
> connection on my tuner. SO I can't help but wonder what the 500ma
> figure actually Apart from the power issues, I was thinking that it
> would be a good idea for more ports to get a piece of the action simply
> for reasons of reduced contention. I have no idea how to manage this.
>


.

Relevant Pages

  • [PATCH] Miscellaneous documentation cleanup: 2.6.30-rc3
    ... The Silicon Motion SM501 multimedia companion chip is a multifunction device ... which may provide numerous interfaces including USB host controller USB gadget, ... +asynchronous serial ports, audio functions, and a dual display video interface. ... -Sometimes it happens that a request enters the io scheduler that is contigious ...
    (Linux-Kernel)
  • Re: [PATCH] Miscellaneous documentation cleanup: 2.6.30-rc3
    ... The Silicon Motion SM501 multimedia companion chip is a multifunction device ... which may provide numerous interfaces including USB host controller USB gadget, ... +asynchronous serial ports, audio functions, and a dual display video interface. ... -Sometimes it happens that a request enters the io scheduler that is contigious ...
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  • 5.3-RC2: Fatal trap 19: non-maskable interrupt trap while in kernel mode
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    (freebsd-current)
  • 5.3-RC2: Fatal trap 19: non-maskable interrupt trap while in kernel mode
    ... couldn't read bus number from cfg space ... 2 ports with 2 removable, ... pckbd0 at pckbc0 ... Texas Instruments TSB43AA21 OHCI IEEE 1394 Host Controller (Firewire ...
    (freebsd-current)
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