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Usb Interface
USB 3.0 – The Next-Generation Interconnect
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Introduction
When was the last time you got impatient with technology not being fast enough? Here is a situation: your flight from San Francisco to New York takes off in 3 hours and you are ready to head to the airport, but you really want to catch up with the all new season of your favorite series "House" which you missed. A friend just sent you a message on Facebook about how much he enjoyed a blockbuster movie he watched last night and you wish you could watch it on the long flight you are about to get on. If I were you, I would be wondering "if only I had the time to simply get all the content I need right now". Today, it would take about 14 minutes to transfer an HD movie of 25GB and almost 9 minutes to transfer a TV Show of 16GB from a PC to your hand held media device. Thankfully, technological innovations are happening at a pace that enables users to get the content they want a lot faster. One such evolution is that of the most universal and ubiquitous interface – USB. USB 3.0 SuperSpeed is here and promises to be the panacea to such situations.
History of USB
In this age of internet and communication revolution, enormous amount of content is being generated, processed and consumed at a staggering rate; and in parallel, mass storage technologies are also undergoing significant innovation. Storage is becoming inexpensive and densities are increasing, driving content sharing. Users no longer worry about conserving hard drive space. The life of a photographer is a lot easier with several storage cards to freely click as many pictures and swap cards out when full. These usage models are becoming increasingly popular not just in the enterprise and professional context, but also in the consumer arena. Still cameras and camcorders are evolving towards higher resolution and better quality pictures, creating a need for a faster interconnect to be able to consume the content. So strong is the need for something faster, that several technology leaders have come together to solve this problem in an elegant and seamless manner. The USB Implementers Forum recognized this urgent need for the next-generation interconnect technology and officially ratified the USB 3.0 specification in November 2008.
Comparison with other Interfaces
Several other serial communication standards boast a data rate similar to that of USB 3.0. For example, PCIe Gen 2.0 has a data rate of 5Gbps and Serial ATA (SATA) III has a data rate of 6Gbps.
Although the USB 3.0 PHY architecture is inspired from PCIe, several key distinctions exit. The USB 3.0 PHY must implement an equalizer required to compensate for cable loss. This allows USB cables to be as long as three meters. The PCIe and SATA PHYs do not have such an equalizer. The LFPS feature described earlier is also unique to the USB 3.0 PHY.
A PCIe link may consist of multiple lanes (i.e. pairs of transmit and receive differential lines) to increase bandwidth, whereas a USB 3.0 link supports only a single lane. Of these three interfaces, true plug and play is enabled only by USB. The SATA standard does support hot-plug, but contingent on the SATA controller functioning in Advanced Host Controller Interface (AHCI) mode.
PCIe is typically used to connect peripheral function cards (such as graphic cards) directly onto the motherboard of a PC.SATA is an interface of choice for mass storage devices such as hard disk drives and optical drives; hence most PCs integrate a SATA host adapter. USB on the other hand serves as a general purpose SuperSpeed or Hi-Speed bridge between a host and virtually any interface.
USB 3.0 also lends itself well to be an alternative interface for transferring video given the increased bandwidth. This could herald some interesting applications in the digital living room – including TV, STB, monitors and gaming consoles. The key advantage of USB versus video interfaces like VGA, DVI,DisplayPort and HDMI is the ubiquity of the interface. With HDCP 2.0 including USB as one of the interfaces, content protection can also be enabled by USB 3.0. Another benefit is the fact that USB is royalty free.
USB Charging
Charging is a key feature that stands out when comparing USB to other interfaces. USB is now the charging interface of choice in several countries. Charging over USB has inherent benefits compared to having discrete chargers for every device. Not only does it lower manufacturing cost by limiting vendor specific chargers, but also has significant impact on the environment in the long run.USB 3.0 hosts and hubs enable the battery charging schemes as defined by the USB Battery Charging Specification.
The USB Battery Charging Specification currently defines three types of usage modes for charging –
1. Host Charger – A host charger is a USB 2.0 host that provides up to 500mA to a downstream port and implements charger detection. A Hi-Speed device may draw only up to 900mA from the host charger.
2. Hub Charger – A hub charger is a USB 2.0 hub that provides up to 500mA to a downstream port and supports charger detection. The charging functionality is very similar to a host charger.
3. Dedicated Charger – A dedicated charger provides power over USB interface but does not enumerate the device. The charging current is limited to 1.5A .The specification also provides for dead battery charging, allowing a dead or very weak battery to draw up to 100mA from a host of hub until it is charged to a reasonable threshold. The distinct advantage of being able to charge over USB will continue to be leveraged in USB 3.0 systems.
Conclusion:
USB 3.0 is anticipated to be the ubiquitous solution for many bandwidth hungry applications. Its evolution from the highly successful USB 2.0 is fueled by increasing multimedia consumption demands and higher density storage technologies. USB 3.0 is definitely a technology trigger in the hype cycle, and will have to show that it can make it through the peak of inflated expectations leading into mass market adoption. The day is fast approaching when you can get all the content you want on your way to the airport, in less than a minute.
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About the Author
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Ashwini Govindaraman, Product Marketing Manager, Cypress Semiconductor Corp., and Sonia Gandhi, Senior Applications Engineer, Cypress Semiconductor Corp.
Do you need a compact memory card for the canon rebel xt camera if it comes with a usb interface?
I really dont know ?
Yes, you need a compact flash card. Buy a 2 Gig one (its a good size, but of course that depends on how many pics you wanna take) Sandisk is prettly reliable. Look for the UItra II by sandisk.
Usb interface can be used by a computer to take pictures directly from the computer and also the usb interface is most importantly used to transfer the pics on your compact flash card to your computer without taking the card out everytime you need to transfer pictures and sticking it into a card reader.
Have fun 
Behringer Guitar USB Interface Demo