Assumptions
For the purpose of this analysis, we will concentrate on the second failure mechanism, babble condition. The sequence of events that result in the application error after a port babble also cause frame drop condition. Therefore, the architectural analysis and possible resolution of the port babble will also largely apply to the frame drop condition. It will be indicated in the next below when this underlying assumption is no longer valid.
The system failure is based on the system’s sensitivity to graphic accelerator responsiveness to pending device driver request.
The PCI Specification does not limit the number of retries a PCI target may execute, and does not indicate any maximum latency before a target must complete a retry condition. Thus, the retry behavior of the graphic accelerator in this case is not in conflict with the current PCI specification.
To try to understand the true nature of the issue, we will break down the failure mechanism into its minimal components, starting with the USB physical layer, then moving to the graphic accelerator driver. It is hoped that with this analysis, an economical and viable solution could be identified.
Wireless USB host controller board and new single – board device wire adapter.
For the purpose of this analysis, we will concentrate on the second failure mechanism, babble condition. The sequence of events that result in the application error after a port babble also cause frame drop condition. Therefore, the architectural analysis and possible resolution of the port babble will also largely apply to the frame drop condition. It will be indicated in the next below when this underlying assumption is no longer valid.
The system failure is based on the system’s sensitivity to graphic accelerator responsiveness to pending device driver request.
The PCI Specification does not limit the number of retries a PCI target may execute, and does not indicate any maximum latency before a target must complete a retry condition. Thus, the retry behavior of the graphic accelerator in this case is not in conflict with the current PCI specification.
To try to understand the true nature of the issue, we will break down the failure mechanism into its minimal components, starting with the USB physical layer, then moving to the graphic accelerator driver. It is hoped that with this analysis, an economical and viable solution could be identified.
Wireless USB host controller board and new single – board device wire adapter.
Product Roadmap :
The experience with USB will enable the company to develop industry – leading products based on the new Wireless USB standard at a very affordable price. Product development efforts are well underway with plans to begin mass production in 2005. the first generation of Wireless USB products will consist of discrete host controllers that connect to the host via a PCI interface and device adapters for existing USB devices. The company will then bring to market single – chip Wireless USB solutions with an integrated controller and PHY.
WUSB Topology
The fundamental relationship in WUSB is a hub and spoke topology, as shown in Figure. In this topology, the host initiates all the data traffic among the devices connected to it, allotting time slots and data bandwidth to each device connected. These relationships are referred to as clusters. The connections are point-to-point and directed between the WUSB host and WUSB device.
The WUSB host can logically connect to a maximum of 127 WUSB devices, considered an informal WUSB cluster. WUSB clusters coexist within an overlapping spatial environment with minimum interference, thus allowing a number of other WUSB clusters to be present within the same radio cell.
Topology will support a dual role model where a device can also support limited host capabilities. This model allows mobile devices to access services with a central host supporting the services. This model also allows a device to access data outside an existing cluster it may currently be connected to by creating a second cluster as a limited host.
Additionally, high spatial capacity in small areas is needed to enable multiple device access to high bandwidth concurrently. Multiple channel activities may take place within a given area. The topology will support multiple clusters in the same area. The number of clusters to be supported is still being determined.
Usage Applications
With the growing use of digital media in the PC, consumer electronic (CE) and mobile communication environments, a common standard interconnect is needed to support the on-going convergence of these environments. The trend toward convenient wireless distribution of digital information provides an opportunity to introduce a single, standard wireless interconnect capable of supporting usage models across all three environments.
CE environment will have high – performance wireless interface expectations. Consumer usage models will center on streaming media distribution that typically uses compression algorithms. The performance objective is to ensure a high quality of service is maintained to meet typical consumer entertainment expectations.
Typical video delivery with standard SDTV / DVD will consume between 3 and 7 Mbps while HDTV will use between 19 and 24 Mbps. A point distribution technology like wireless USB with an effective bandwidth of 480 Mbps could manage multiple HDTV streams. Host buffering could enable a network backbone to effectively distribute content to all distribution hosts, enhancing the quality experience for all uses.
Wireless USB will benefit both from the success of wired USB in the PC market and from the growing demand for wireless technologies in the booming consumer electronics market. The shift to wireless will revitalize exiting markets and contribute to the creation of new markets, particularly for multimedia devices that can take advantage of the high data rate. For example, Wireless USB will make possible next – generation notebook PCs with fewer input output connectors and a more compact design, as well as digital AV equipment that can wirelessly transmit high definition video.
Home Usage Models of USB
It ht home environment, Wireless USB will eliminate the tangle of cables connecting PCs and peripherals such as printers, scanners, monitors, and digital cameras. In addition, it will wirelessly connect myriad home products, including PCs, stereos, HDTVs, STBs, DVD players, video recorders, digital AV equipment, and the growing class of devices with rich functionality and multimedia capabilities. The home of the not-too-distant wireless future will support individual high – speed wireless personal area networks (WPANs) for entertainment, home office equipment, gaming, and audio devices. Wireless USB will introduce a standard wireless interconnect that supports multiple device and usage models.
The experience with USB will enable the company to develop industry – leading products based on the new Wireless USB standard at a very affordable price. Product development efforts are well underway with plans to begin mass production in 2005. the first generation of Wireless USB products will consist of discrete host controllers that connect to the host via a PCI interface and device adapters for existing USB devices. The company will then bring to market single – chip Wireless USB solutions with an integrated controller and PHY.
WUSB Topology
The fundamental relationship in WUSB is a hub and spoke topology, as shown in Figure. In this topology, the host initiates all the data traffic among the devices connected to it, allotting time slots and data bandwidth to each device connected. These relationships are referred to as clusters. The connections are point-to-point and directed between the WUSB host and WUSB device.
The WUSB host can logically connect to a maximum of 127 WUSB devices, considered an informal WUSB cluster. WUSB clusters coexist within an overlapping spatial environment with minimum interference, thus allowing a number of other WUSB clusters to be present within the same radio cell.
Topology will support a dual role model where a device can also support limited host capabilities. This model allows mobile devices to access services with a central host supporting the services. This model also allows a device to access data outside an existing cluster it may currently be connected to by creating a second cluster as a limited host.
Additionally, high spatial capacity in small areas is needed to enable multiple device access to high bandwidth concurrently. Multiple channel activities may take place within a given area. The topology will support multiple clusters in the same area. The number of clusters to be supported is still being determined.
Usage Applications
With the growing use of digital media in the PC, consumer electronic (CE) and mobile communication environments, a common standard interconnect is needed to support the on-going convergence of these environments. The trend toward convenient wireless distribution of digital information provides an opportunity to introduce a single, standard wireless interconnect capable of supporting usage models across all three environments.
CE environment will have high – performance wireless interface expectations. Consumer usage models will center on streaming media distribution that typically uses compression algorithms. The performance objective is to ensure a high quality of service is maintained to meet typical consumer entertainment expectations.
Typical video delivery with standard SDTV / DVD will consume between 3 and 7 Mbps while HDTV will use between 19 and 24 Mbps. A point distribution technology like wireless USB with an effective bandwidth of 480 Mbps could manage multiple HDTV streams. Host buffering could enable a network backbone to effectively distribute content to all distribution hosts, enhancing the quality experience for all uses.
Wireless USB will benefit both from the success of wired USB in the PC market and from the growing demand for wireless technologies in the booming consumer electronics market. The shift to wireless will revitalize exiting markets and contribute to the creation of new markets, particularly for multimedia devices that can take advantage of the high data rate. For example, Wireless USB will make possible next – generation notebook PCs with fewer input output connectors and a more compact design, as well as digital AV equipment that can wirelessly transmit high definition video.
Home Usage Models of USB
It ht home environment, Wireless USB will eliminate the tangle of cables connecting PCs and peripherals such as printers, scanners, monitors, and digital cameras. In addition, it will wirelessly connect myriad home products, including PCs, stereos, HDTVs, STBs, DVD players, video recorders, digital AV equipment, and the growing class of devices with rich functionality and multimedia capabilities. The home of the not-too-distant wireless future will support individual high – speed wireless personal area networks (WPANs) for entertainment, home office equipment, gaming, and audio devices. Wireless USB will introduce a standard wireless interconnect that supports multiple device and usage models.
Typical Home Applications
PCs and peripherals : complete pc's are connected from usb.
External storage devices (HDDs) : External Hard Disk Drive's, pen drive's are working from usb.
Game consoles : Games also run from usb.
Digital cameras : Digital camara also working from usb.
DVD players : Newly introduced DVD players have sum usb port for watch the movies from pen drive's.
MP3 players : MP3 players are working from usb, DVD, CD & Audio CD's.
CD players : Newly introduced CD players have Usb ports.
Office Usage Models of usb
In the office environment, wireless USB will offer a broad range of time – saving and productivity – enhancing applications. Users of portable devices such as notebook PCs, PDAs, and cell phones will be able to connect to printers and scanners quickly and easily. Employees will be able to share printers, scanners and storage devices, back up files quickly, exchange large without sending them through e-mail, and synchronize their PDAs to a network – all without a single wire.
Typical Home Applications
Laptop and notebooks computers works in usb.
Printers : New printer conected computer from usb.
Scanners : Old and new scanners are connected to computer from usb.
Projectors : Newly introduced projecters (mini theater's) are connected from usb.
Mass storages devices (HDDs) : Pocket Hard disk drives are works from usb.
Cell Phones : Newly introduced cells are connected from usb's.
PCs and peripherals : complete pc's are connected from usb.
External storage devices (HDDs) : External Hard Disk Drive's, pen drive's are working from usb.
Game consoles : Games also run from usb.
Digital cameras : Digital camara also working from usb.
DVD players : Newly introduced DVD players have sum usb port for watch the movies from pen drive's.
MP3 players : MP3 players are working from usb, DVD, CD & Audio CD's.
CD players : Newly introduced CD players have Usb ports.
Office Usage Models of usb
In the office environment, wireless USB will offer a broad range of time – saving and productivity – enhancing applications. Users of portable devices such as notebook PCs, PDAs, and cell phones will be able to connect to printers and scanners quickly and easily. Employees will be able to share printers, scanners and storage devices, back up files quickly, exchange large without sending them through e-mail, and synchronize their PDAs to a network – all without a single wire.
Typical Home Applications
Laptop and notebooks computers works in usb.
Printers : New printer conected computer from usb.
Scanners : Old and new scanners are connected to computer from usb.
Projectors : Newly introduced projecters (mini theater's) are connected from usb.
Mass storages devices (HDDs) : Pocket Hard disk drives are works from usb.
Cell Phones : Newly introduced cells are connected from usb's.
many more etc.
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