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November 1, 2007, 11:15 pm
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Device Manager shows all the ports as plain USB.
That said, can I make any of them USB2 via software (driver)
upgrading? Or do I have to buy a PCI card with USB2 capability?
If I connect a USB peripheral device to a USB port, what will tell me
if it is running 1 or 2?
Excuse my ignorance on the subject.
> Device Manager shows all the ports as plain USB.
There's probably a way to discern it from entries in the Device Manager,
by see if there are "enhanced" entries. I would probably just identify
what hardware is providing the ports, mainboard or add-in card, and
check out the specs for that device.
That would work.
Sort of. If the devices is USB2, Windows XP will often whine if you
plug it into a USB1/1.1 port. Unfortunately, it sometimes whines when
it's also a USB2 port.
First of all, start with this tool. Download link is on the
right of the page. "UVCView.x86.exe"
I have a low speed mouse plugged into a USB port, and it shows as:
Current Config Value: 0x01 -> Device Bus Speed: Low
That means the port may have had high and low as options,
and it is currently running in low.
For the device itself, it declares its capabilities in the
bcdUSB field. My mouse reports USB 1.0 as its max. Possible values are
0100, 0110, and 0200, for USB 1.0, USB 1.1, and USB 2.0
"The bcdUSB field reports the highest version of USB the device supports"
What isn't shown, is how the eight ports on my motherboard, map to the
five entries in Device Manager. For an example of that, see section
18.104.22.168 "Port routing logic" on PDF page 223. The figure shows how
four UHCI (low speed) logic blocks, and one EHCI (enhanced, high speed)
logic block, are dynamically switched to eight USB ports.
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