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mice on xHCI device, USB 3.0

post #1 of 5
Thread Starter 
Got to revisit this subject.. I have a motherboard with a USB 3.0 device. Both my KB and Mouse are USB. I can turn off legacy USB support through bios and just use the USB 3.0 but I was told if both the mouse and kb are on the xHCI port/controller it will effect the way the mouse acts. IIRC I was told the mouse would function as if on a legacy controller like on the Interrupt cadence instead of MSI mode.

What's the truth about this?
     
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post #2 of 5
USB 2.0 and 3.0 ports and plugs are different (usb 3.0 has extra pins for extra throughput).
When you connect your USB 2.0 mouse to USB 3.0 port, it only connects with some of the pins, and therefor makes a usb 2.0 connection.


image in this article of the differences between USB 2.0 connector and USB 3.0 connector.
http://theydiffer.com/difference-between-usb-2-0-and-3-0-cables/

Quote:
USB 3.0 standard pinout

Pin # Pin Name Wire Color Description
1 V-BUS Red + 5 volts power
2 USB 2.0 Data- White USB 2.0 Data –
3 USB 2.0 Data+ Green USB 2.0 Data+
4 Ground Black Common return path for electrical current
5 USB 3.0 Transmit- Purple Super speed transmitter –
6 USB 3.0 Transmit+ Orange Super speed transmitter +
7 Ground Drain N/A Ground for signal return
8 USB 3.0 Receive- Blue Super speed receiver –
9 USB 3.0 Receive+ Yellow Super speed receiver +
Quote:
One key difference between the two cables is their pinouts. A USB 2.0 can only have as many as 4 or 5, but a USB 3.0 has 9.

Edited by spinFX - 10/3/16 at 1:37am
Ol'Faithful
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Ol'Faithful
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post #3 of 5
I use my mouse in USB 3 biggrin.gif
post #4 of 5
Thread Starter 
Quote:
Originally Posted by spinFX View Post

USB 2.0 and 3.0 ports and plugs are different (usb 3.0 has extra pins for extra throughput).
When you connect your USB 2.0 mouse to USB 3.0 port, it only connects with some of the pins, and therefor makes a usb 2.0 connection.


image in this article of the differences between USB 2.0 connector and USB 3.0 connector.
http://theydiffer.com/difference-between-usb-2-0-and-3-0-cables/

Quote:
USB 3.0 standard pinout

Pin # Pin Name Wire Color Description
1 V-BUS Red + 5 volts power
2 USB 2.0 Data- White USB 2.0 Data –
3 USB 2.0 Data+ Green USB 2.0 Data+
4 Ground Black Common return path for electrical current
5 USB 3.0 Transmit- Purple Super speed transmitter –
6 USB 3.0 Transmit+ Orange Super speed transmitter +
7 Ground Drain N/A Ground for signal return
8 USB 3.0 Receive- Blue Super speed receiver –
9 USB 3.0 Receive+ Yellow Super speed receiver +
Quote:
One key difference between the two cables is their pinouts. A USB 2.0 can only have as many as 4 or 5, but a USB 3.0 has 9.

So then will the host controller (xHCI) still work together with the USB 2.0 devices under MSI mode?
     
CPUMotherboardGraphicsRAM
i7 970 between 4 - 4.4GHz Gigabyte UD7 Rev 2.0 EVGA GTX 1070 FE 2000MHz CL8.8.8.24 1T tRFC 88 
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Samsung Evo 128Gb OCZ VertexLE 100Gb Megahalems  Windows 10 Pro 64 
MonitorKeyboardPowerCase
Asus VG248QE Corsair K70  EVGA Supernova T2 1000W Lian Li PC-A20 
MouseAudio
Sidewinder MX5 Creative Zx 
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CPUMotherboardGraphicsRAM
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Samsung Evo 128Gb OCZ VertexLE 100Gb Megahalems  Windows 10 Pro 64 
MonitorKeyboardPowerCase
Asus VG248QE Corsair K70  EVGA Supernova T2 1000W Lian Li PC-A20 
MouseAudio
Sidewinder MX5 Creative Zx 
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post #5 of 5
If you're talking about using a usb 2.0 item in a 3.0 port in msi mode then yes it works
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