Question on USB2
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
|||||||||||||
|
Posted by gecko on July 25, 2008, 7:35 pm
Please log in for more thread options I have read that the word 'enhanced' in Device Manager indicates my machine has USB2. Now then - I have eight USB ports. Are they all USB2? Is there some utility that will tell me which if not all are actually running at USB2 speed? I fear that some may and some may not. Or maybe my fears are unfounded? Thanks -GECKO | |||||||||||||
|
Posted by kony on July 25, 2008, 9:27 pm
Please log in for more thread options The easiest way is to tell us about your hardware, and/or look up the chipset specs yourself. | |||||||||||||
|
Posted by gecko on July 26, 2008, 7:39 am
Please log in for more thread options
>The easiest way is to tell us about your hardware, and/or
>look up the chipset specs yourself. Posted. Thanks -GECKO | |||||||||||||
|
Posted by Joel on July 25, 2008, 10:59 pm
Please log in for more thread options
> Prev posted in wrong group mouse slipped sorry
> > I have read that the word 'enhanced' in Device Manager indicates my > machine has USB2. Now then - I have eight USB ports. Are they all > USB2? Is there some utility that will tell me which if not all are > actually running at USB2 speed? I fear that some may and some may > not. The easiest way to find out is looking at the MANUAL of your motherboard to see what it says, or if it's somewhere around 3-4 years old then the chance to be USB2 is very high, and 8 ports is kinda unusual to me (all momboards I have have 4 USB2 ports) so it seems like yours is very new and they may be USB2. > Or maybe my fears are unfounded?
I can't tell how much fear you have at your end. And what good to fear the unknown for? > Thanks
> > -GECKO | |||||||||||||
|
Posted by Paul on July 26, 2008, 12:11 am
Please log in for more thread options gecko wrote:
> Prev posted in wrong group mouse slipped sorry
> > I have read that the word 'enhanced' in Device Manager indicates my > machine has USB2. Now then - I have eight USB ports. Are they all > USB2? Is there some utility that will tell me which if not all are > actually running at USB2 speed? I fear that some may and some may > not. > Or maybe my fears are unfounded? > > Thanks > > -GECKO There are typical ways they're set up. In terms of USB 1.1 capability, two ports are connected to one logic block. If you saw four of the lower speed entries in Device Manager, that would be enough to control eight ports. On USB2, there can be one logic controller which hooks to all eight ports. So when you see the "Enhanced" entry, it applies to all the ports on the Southbridge. Say I had, a four port PCI based USB card, and I also had USB ports on my Southbridge (chipset) chip. And I looked in Device Manager and saw two Enhanced entries. The exact text string for both would be different. One Enhanced entry would correspond to the Southbridge (controlling all of its eight ports), and the other Enhanced entry would be for the PCI card (controlling its four ports). So it helps to know how many chips are involved, because an entry in Device Manager likely won't span two chips. Some of the recent Intel Southbridges have opted for two USB2 logic blocks, spreading the ports between the two blocks. The motherboard would likely have more than 8 USB ports on it. I'd expect to see two Enhanced entries there. So those are some possible Device Manager patterns. For Intel chipsets, you can download tech documents from the Intel site, and see how many logic blocks are used. Intel even provides a diagram, showing how the ports are dynamically bound to a logic block (USB1.1 or USB2 block). For example, try figure 5-14 on PDF page 222 here. EHCI is an Enhanced logic block. The little switches on each USB physical port, flip the port between a USB1.1 logic block, and a USB2 logic block, according to the capabilities of the newly plugged in USB external device. In Device Manager, this computer would have two Enhanced entries, for the two EHCI blocks. http://www.intel.com/design/chipsets/datashts/316972.htm Paul | |||||||||||||
| Similar Threads | Posted |
| Question on USB2 | July 25, 2008, 7:35 pm |
| USB and USB2.0 | September 15, 2006, 5:36 pm |
| USB2? | November 1, 2007, 7:15 pm |
| More on USB2 | November 3, 2007, 6:06 pm |
| Hi Speed USB2 | July 23, 2005, 11:43 am |
| Help: USB2 speeds | December 2, 2005, 12:41 pm |
| USB1 or USB2 | January 8, 2006, 5:54 am |
| usb2.0 & firewire hub | May 25, 2006, 10:21 pm |
| Slow USB2! | June 17, 2006, 3:19 am |
| USB2 hubs | January 31, 2007, 8:02 pm |
| Decent IDE-USB2 bridge? | June 20, 2006, 5:38 am |
| How can I tell if my USB ports are USB2 or USB1 | November 3, 2006, 7:14 am |
| Do hubs slow down USB2 ? | May 1, 2007, 5:19 pm |
| Checking USB2 Port | September 24, 2007, 5:00 pm |
| Please recommend a USB2 external HD | September 13, 2008, 5:55 am |
>
>I have read that the word 'enhanced' in Device Manager indicates my
>machine has USB2. Now then - I have eight USB ports. Are they all
>USB2? Is there some utility that will tell me which if not all are
>actually running at USB2 speed? I fear that some may and some may
>not.
>Or maybe my fears are unfounded?
>
>Thanks
>
>-GECKO