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What exactly happened to USB 2.0 (EHCI) on Skylake?

post #1 of 9
Thread Starter 
I read they removed it completely and that only xHCI (USB 3.0) is available now. Yet, I still see plenty of Skylake motherboards with USB 2.0, can anyone explain what they did exactly?

thanks
post #2 of 9
Quote:
Originally Posted by pstN View Post

I read they removed it completely and that only xHCI (USB 3.0) is available now. Yet, I still see plenty of Skylake motherboards with USB 2.0, can anyone explain what they did exactly?

thanks

 

Isnt it just the amount of "data connections" that define the usb version? and since its fully backwards compatible it shouldn't matter right? USB2.0 is just cheaper to create, since it has just 4 wires instead of 9?

 

Just speculating.

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post #3 of 9
Quote:
Originally Posted by pstN View Post

I read they removed it completely and that only xHCI (USB 3.0) is available now. Yet, I still see plenty of Skylake motherboards with USB 2.0, can anyone explain what they did exactly?

thanks

Whatever you read is wrong (or you read it wrong); you can see on the intel website the technical specifications of the chipsets. Z170 for example supports usb 2.0 natively. In fact, the chipset supports up to 14 USB ports but only 10 USB 3.0 ports, so if all 14 are provided at least 4 of them would have to be 2.0.
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post #4 of 9
Thread Starter 
Quote:
Originally Posted by Deuce65 View Post

Whatever you read is wrong (or you read it wrong); you can see on the intel website the technical specifications of the chipsets. Z170 for example supports usb 2.0 natively. In fact, the chipset supports up to 14 USB ports but only 10 USB 3.0 ports, so if all 14 are provided at least 4 of them would have to be 2.0.

But then why does everyone with a skylake system have a hard time installing W7 without being forced to slipstream USB 3 drivers? or using Mouse/KB simulation? I was looking at some bios manuals for Z170 motherboards and they offer no EHCI hand off, which I use to always see on mobos before.

Another example : http://www.dell.com/support/article/us/en/04/SLN300564 Many of the systems they list on this page have USB 2 ports..
post #5 of 9
Quote:
Originally Posted by pstN View Post

But then why does everyone with a skylake system have a hard time installing W7 without being forced to slipstream USB 3 drivers? or using Mouse/KB simulation? I was looking at some bios manuals for Z170 motherboards and they offer no EHCI hand off, which I use to always see on mobos before.

Another example : http://www.dell.com/support/article/us/en/04/SLN300564 Many of the systems they list on this page have USB 2 ports..

Windows 7 does not have native support for USB 3 (i.e., no built in driver). Intel provides chipset drivers, but you have to get to that point first (i.e., install an OS). Essentially what happens if you are attempting to install Windows 7 from a USB 3 device is setup starts, loads initial drivers and such, *doesn't* load a USB 3 driver because it doesn't have one, and then you get stuck because the setup program no longer recognizes your installation media. You either install from a non usb source, install from a usb 2 source, or put the intel usb 3 drivers into the windows installer files. Or of course, use an OS that has native usb 3 support. Its the same thing if your mouse or keyboard is usb 3.0. You get part way through the install and they stop working because there is no driver at all.
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post #6 of 9
I believe pstN was asking "if Skylake does have native EHCI, why don't people plug the boot media into a EHCI port?"
post #7 of 9
Thread Starter 
Quote:
Originally Posted by MrKoala View Post

I believe pstN was asking "if Skylake does have native EHCI, why don't people plug the boot media into a EHCI port?"


yes pretty much, I don't understand how there can usb 2 ports on an xHCI controller. are they just throttled usb 3 ports?
post #8 of 9
Quote:
Originally Posted by MrKoala View Post

I believe pstN was asking "if Skylake does have native EHCI, why don't people plug the boot media into a EHCI port?"

They do, and it works fine. You guys are conflating two totally unrelated things into one, and that is where the confusion is coming from.

Windows 7: No native USB 3 support, it has to come from the device manufacturer (Intel in this case). This has nothing at all to do with skylake; youl will have the exact same issues if you try to install Windows 7 on a usb 3 device on Haswell (or anything else). I have a Haswell NUC that only has USB 3 ports and Windows 7 cannot be installed without inserting the drivers (or jerry rigging the onboard usb 2 port).

Skylake: Supports up to 10 USB 3 ports and 4 USB 2 ports. Of course, just because it supports that many doesn't mean any particular motherboard is going to have that many. Some boards do not have any usb 2 ports even though the chipset could do it. Some do. If you have a skylake board that has usb 2 ports and you attempt to install windows 7 using those usb 2 ports, you will not have any issues. If you attempt to install windows 7 on a usb 3 port, skylake ot otherwise, you will have issues.
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post #9 of 9
Quote:
Originally Posted by pstN View Post

yes pretty much, I don't understand how there can usb 2 ports on an xHCI controller. are they just throttled usb 3 ports?

In that case, they are just USB3 ports with USB2 pins connected. The controller is still xHCI, so without a driver it doesn't work.
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