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Scalability[ edit ] The xHCI architecture was designed to be highly scalable, capable of supporting 1 to USB devices and 1 to root hub ports.

Since each USB device is allowed to define up to 31 endpoints, an xHCI ASMedia XHCI 1.1 Controller supported devices would have to support 7, separate total endpoints. Classically, each memory buffer associated with an endpoint is described by a queue of physical memory blocks, where the queue requires a head pointer, tail pointer, length and other registers to define its state.

There are many ways to define queue state, however if one were to assume 32 bytes of register space for each queue, then almost a KB of register space would be required to support 7, queues. Typically only a small number of USB devices are attached to a system at one time, and on the average a USB device supports endpoints, of which only a subset of the endpoints are active at the same time. The contexts are designed so that they can be cached by the xHCI, and "paged" in and out as a function of endpoint activity. Thus a vendor can scale their internal xHCI Endpoint Context cache space and resources to match the practical usage models expected for their products, rather than the architectural limits that they support.

Ideally the internal cache space is selected so that under normal usage conditions, there is no context paging by the xHCI. Also USB endpoint activity tends ASMedia XHCI 1.1 Controller be bursty. That is, at any point in time a large number of endpoints may be ready to move data, however only a subset are actively moving data. For instance, the interrupt IN endpoint of a mouse may not transfer data for hours if the user is away from their desk. For instance, a vendor could choose to limit the number of USB devices that it supported for a tablet xHCI implementation to 16 devices.

Extensible Host Controller Interface

A vendor can further take advantage of xHCI architectural features to scale its internal resources to match its target usage models. To eliminate a redundant industry effort of defining an open version of a USB 2. Over companies have contributed to the xHCI specification. Linux kernels since contain xHCI drivers, [4] but for older ASMedia XHCI 1.1 Controller there are drivers available online. Version history[ edit ] The xHCI specification uses "errata" files to define updates and clarifications to a specific release.

USB Host Controllers

The changes in the ASMedia XHCI 1.1 Controller files are accumulated in each release. Refer to the associated errata files for the details of specific changes. Most changes defined in the xHCI errata files are clarifications, grammatical or spelling corrections, additional cross-references, etc. Changes that are determined to be architectural utilize a Capability flag to determine whether a particular feature is supported by an xHCI implementation, and an Enable flag to turn on the feature. The xHCI specification evolved through several versions before its official release in Released in August USB 0. Released in December First shipping devices based on this version.


Sometimes the crash would occur with a simple USB 3. We decided to remove the ASMedia 1.

Asmedia USB / eXtensible Host Controller Driver Download

We found that the controller became as stable as the Intel controller but with the tradeoff of losing USB 3. This was not a compromise we were willing to make.

This gave us an idea. Both 3. Click to enlarge We found that the instability we encountered on the on-board ASM 3. Once again we removed the 1.

Click to enlarge At the moment Plugable is still testing the ASMedia ASM controller but the early results are looking great after finding a stable driver. Please note that Windows and DisplayLink does have limits to how many monitors can be attached.

Asus P8H67-I PRO PC Diagnostics2. How to use DriverMax to install ASMedia Technology Inc ASMedia XHCI 1.1 Controller driver
Gateway NV47H Conexant Modem1. Manually install ASMedia Technology Inc ASMedia XHCI 1.1 Controller driver

Our demonstration here is unlikely to initialize all 36 adapters with monitors attached successfully. Realistically we have been able to get up to 14 with success in the past.

Here is a step by step manual guide for ASMedia XHCI Controller software installation process on Windows 7 / 8 / / Vista / XP. 1 Download USB. Compliant with Type-C Specification Revision .


ASM is the next generation Universal Series Bus xhci host controller, bridging PCI Express to USB

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