Re: P4B533 BIOS setup question

In article <qjuef1pl778mktjdpee40c8uggr14v3tdm@xxxxxxx>,
nigel@xxxxxxxxxxxxxxxxxxx wrote:

> Hi,
>
> I'm about to upgrade my system (P4B533 BIOS rev 1004) to Windows
> XP Pro SP2 (clean build from scratch) and I'm somewhat confused
> by the USB controller settings in the PCI configuration section.
> I have been using all 3 ports enabled in the USB 1.1 Controlers
> section as I never bothered to install the USB 2.0 drivers into
> Windows 98SE (didn't have any USB2 devices). Now I want to set
> all ports to USB2 devices if possible and I can't decide on how
> to set the USB1.1 Controllers section and the USB 2.0 Controller
> section. Should I set the USB 1.1 Controllers section to DISABLED
> and the USB 2.0 Controller to ENABLED or what?
>
> Also, does enabling this second option enable USB 2.0 speeds on
> all six USB ports?
>
> Thanks,
> Nigel
>
> Aagh! Every time I learn something new... it pushes something old
> out of my brain!

Turn them both on. The controllers they refer to, are the blocks
of logic inside the Southbridge. A USB 1.1 controller is shared
over two ports, so three of them are needed for a total of six
USB ports. A USB 2.0 controller is shared over all ports, so
the same controller is time shared over the six ports.

When you plug a USB device into a port, there is a dynamic process
that decides whether the port is bound to a USB 1.1 controller
logic block, or the USB 2.0 controller block. The USB driver
software should do this automatically, so I cannot think of a
good reason to disable any logic blocks in the Southbridge.

To learn more about the chipset on your motherboard, you can go
to developer.intel.com and download a datasheet for the
Northbridge and the Southbridge. For example, the Southbridge
is here, and is a 7MB download (a little too technical for
casual reading, so if you are on a dialup modem, don't
bother):

http://www.intel.com/design/chipsets/datashts/290744.htm

The feature summary in the datasheet says this for ICH4:

"USB
? Includes three UHCI host controllers that support
six external ports
? Includes one EHCI high-speed USB 2.0
Host Controller that supports all six ports
? Supports a USB 2.0 high-speed debug port
? Supports wake-up from sleeping states S1­S5
? Supports legacy keyboard/mouse software"

HTH,
Paul
.

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