Usb 3.1 Extensible Host Controller Download

So, why is it that in Device Manager, under "Universal Serial Bus controllers", there is an entry that reads "Intel(R) USB 3.0 eXtensible Host Controller - 0100 (Microsoft)"? To give more info, this is the list of entries:

If you look at the datasheet for the Intel Atom Z3735F processor in these both devices likely exist on the CPU chip itself, USB for sure and serial port more than likely. Its not that "OEMs are indeed stupid and use USB 3.0 controllers, but use 2.0 ports." Its more often that the engineers had a price point and a feature list they were given. They just did not utilize it for cost or space considerations.

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The eXtensible Host Controller Interface (xHCI) is a technical specification that provides a detailed framework for the functioning of a computer's host controller for Universal Serial Bus (USB). Known alternately as the USB 3.0 host controller specification, xHCI is designed to be backward compatible, supporting a wide range of USB devices from older USB 1.x to the more recent USB 3.x versions.

The xHCI is a radical break from the previous generations of USB host controller interface architectures (i.e. the Open Host Controller Interface (OHCI), the Universal Host Controller Interface (UHCI), and the Enhanced Host Controller Interface (EHCI)) on many counts.Following are the key goals of the xHCI architecture:

When USB was originally developed in 1995, it was targeted at desktop platforms to stem the proliferation of connectors that were appearing on PCs, e.g. PS/2, serial port, parallel port, game port, etc., and host power consumption was not an important consideration at the time. Since then, mobile platforms have become the platform of choice, and their batteries have made power consumption a key consideration. The architectures of the legacy USB host controllers (OHCI, UHCI, and EHCI) were very similar in that the "schedule" for the transactions to be performed on the USB were built by software in host memory, and the host controller hardware would continuously read the schedules to determine what transactions needed to be driven on the USB, and when, even if no data was moved. Additionally, in the case of reads from the device, the device was polled each schedule interval, even if there was no data to read.

Legacy USB host-controller architectures exhibit some serious shortcomings when applied to virtualized environments. Legacy USB host-controller interfaces define a relatively simple hardware data-pump; where critical state related to overall bus-management (bandwidth allocation, address assignment, etc.) resides in the software of the host-controller driver (HCD). Trying to apply the standard hardware IO virtualization technique - replicating I/O interface registers - to the legacy USB host controller interface is problematic because critical state that must be managed across virtual machines (VMs) is not available to hardware. The xHCI architecture moves the control of this critical state into hardware, enabling USB resource management across VMs. The xHCI virtualization features also provide for:

The EHCI utilizes OHCI or UHCI controllers as "companion controllers", where USB 2 devices are managed through the EHCI stack, and the port logic of the EHCI allows a low-speed or full-speed USB device to be routed to a port of a "companion" UHCI or OHCI controller, where the low-speed or full-speed USB devices are managed through the respective UHCI or OHCI stack. For example, a USB 2 PCIe host controller card that presents 4 USB "Standard A" connectors typically presents one 4-port EHCI and two 2-port OHCI controllers to system software. When a high-speed USB device is attached to any of the 4 connectors, the device is managed through one of the 4 root hub ports of the EHCI controller. If a low-speed or full-speed USB device is attached to connectors 1 or 2, it will be routed to the root hub ports of one of the OHCI controllers for management, and low-speed and full-speed USB devices attached to connectors 3 or 4 will be routed to the root hub ports of the other OHCI controller. The EHCI dependence on separate host controllers for high-speed USB devices and the group of low-speed and full-speed USB devices results in complex interactions and dependencies between the EHCI and OHCI/UHCI drivers.

Support for Streams was added to the USB 3.0 SuperSpeed specification, primarily to enable high performance storage operations over USB. Classically there has been a 1:1 relationship between a USB endpoint and a buffer in system memory, and the host controller solely responsible for directing all data transfers. Streams changed this paradigm by providing a 1-to-many "endpoint to buffer" association, and allowing the device to direct the host controller as to which buffer to move. The USB data transfers associated with a USB Stream endpoint are scheduled by the xHCI the same as any other bulk endpoint is, however the data buffer associated with a transfer is determined by the device.

The EHCI specification was defined by Intel to support USB 2.0 devices. The EHCI architecture was modeled after the UHCI and OHCI controllers, which required software to build the USB transaction schedules in memory, and to manage bandwidth and address allocation. To eliminate a redundant industry effort of defining an open version of a USB 2.0 host controller interface, Intel made the EHCI specification available to the industry with no licensing fees.

xHCI 1.0 controllers have been shipping since December 2009. Linux kernels since 2009 contain xHCI drivers,[4] but for older kernels there are drivers available online. Windows drivers for XP, Vista, and Windows 7 are available from the respective xHCI vendors. xHCI drivers for embedded system are available from MCCI, Jungo, and other software vendors. xHCI IP blocks are also available from several vendors for customization in SOC environments. xHCI 1.1 controllers and devices began shipping in 2015.

My mouse, keyboard, and printer are all plugged into USB 2.0 ports. I tried disabling the USB 3.0 Extensible controller, which just makes the USB 3.10 Extensible controller wake up the computer -_- Further, I cannot even disable the 3.1 Extensible controller, I only have the option of uninstalling it!

There is a hardware limit of 96 endpoints on most Intel XHCI controllers. It wouldn't surprise me if each camera is using 8 endpoints, that's a pretty typical number for complex, modern devices. The hubs occupy endpoints as well. You can confirm this with USBView. This is a controller hardware limitation, and there's no way around it.

First: i do not know if there might be a bug/feature limit on your USB host controller or spec limitation (in case of devices, hubs in row) change in USB2 vs USB3 (Davids Answer seems to show the limit of the intel controller)

Make sure you do not use too long cables between host and hubs, low cost ones did produce high amount of issues for us on even 3m length, while USB2.0 specs allow for 5m Cable until you need a "Hub"Measure the power output of the USB cables.Most of the time you get 7 Port hubs there are actually 2 Hubs inside the case row.So you should check which port on your hub is connected to the "primary" and "secondary" hub.

We solved the same problem by putting in an internal self-powered usb 3.0 4-Port PCI-Express Add-on Card. But only if your computer has the PCIe expansion slot. This adds additional host controller as the Intel one has reached its limit.

Hi, my usb ports keep dropping out, i get no message, i just get the exclamation mark in device manager, if i reboot it comes back but then goes again. Its amd usb 3.0 extensible host controller - 1.0 (microsoft) - I am on Windows 10 1909, its an HP PC and There are no missing drivers, can you help at all please?

When I right clicked uninstalled the Intel usb 3.0 extensible host controller, I lost all mouse and keyboard access and had to safe boot and revert to last know working settings (I still cannot use USB 2.0 at all). I'm concerned that I my uninstall one of the drivers and lost access to the keyboard and mouse forever - no ability to lose use the keyboard in safe mode.

I booted into safe and reverted to last known settings, then booted into safe mode and removed all of the USB controllers except the USB 3.0. After rebooting I have normal access to the USB 3, but not the USB 2 which is an issue. I need to reactivate the USB 2.

Also, I'm now receiving the "Power surge on hub port" error message again. Previously I had never, ever received this message until I installed the USB 3 extensible host controller driver. Since I have no USB 2 right now, I can't plug the keyboard/mouse into the usb 2 and until/reinstall the USB 3 drivers.

I debugged with v.marolda and it ended up being the Intel USB 3.1 controller wants to be called HCD1. Its a bug in their driver. I couldnt find any way to alert intel to a bug via email without joining some technical support program. So i hope they just fix it as it will conflict with other normal hardware host controllers.

On boot virtualhere searches for a spare host controller name. HCD0 is taken by the root host controller, so HCD1 is usually available and virtualhere driver calls itself that. However sometimes there is a race condition with another driver and so virtualhere will take the next number HCD2.

However the intel driver doesnt do this, it just fails if HCD1 is taken. Whereas really it should fall back to taking the next name e.g HCD2 or HCD3 but it doesnt and thats the "Object name already exists " error

I feel like this should be noted.

I have Dell Latitude laptop with Win 10 21H2 that has two internal HCs and a Thunderbolt 3 dock also with two HCs.

After VirtualHere installation I found that USBs on dock stopped working if dock being hotplugged after boot. After experimenting a little I found that if I set HCD=4 - one of dock controllers starts working; HCD=5 - everything works.

This looks like enumeration issue - maybe VirtualHere controller ID somehow not being counted as "used"? ff782bc1db