Experimental VME backplane databus can move data at 1 gigabit per second

SCOTTSDALE, Ariz., 13 Nov. 2006. Computer scientists are on the verge of boosting VME backplane databus speeds to as fast as 1 gigabit per second, or to enable a larger number of backplane slots to function at the same speed without incurring any substantial cost penalty, officials of VITA, the open-standards organization in Scottsdale, Ariz., announced today.

Inventor Andrew Berding, creator of the VME 320 standard, has invented a way to create a backplane where driver signals are independent of their backplane slots to create more robust VME signals than ever before to speed backplane data throughput.

Berding's idea is to create a VME backplane databus in which all slots function identically, which is distinct from previous generations of VME backplanes that suffered from having different slots act differently, Berding says.

Older generations of VME backplanes, which move data between 32 and 320 megabits per second, may have drivers in end slots that try to move loads similarly to a long, slow, heavily loaded, low impedance transmission line, resulting in data that arrives at the far end too late -- after it has already been sampled by the receiver, Berding says.

Likewise, a driver in a center slot attempts to drive a load that acts like two heavily loaded transmission lines in parallel. As a consequence, the driver may not have enough ability to drive a signal of sufficient amplitude to be received unambiguously somewhere between a guaranteed "1" or a "0." Either case results in an unreliable system, Berding says.

Current backplanes, he says, stitch the copper traces from slot 1 to 2 to 3 to 4 and so on until the last slot. One exception to this is the star-wired backplane where all slots have a separate trace that connect near the center slot. Rather than acting as transmission lines, Berding says, it tends to act more like a lumped capacitance. There is still some variation in waveforms depending on which slot the driver is located, but the variations are minor.

Berding's new VME backplane databus uses an unconventional wiring pattern to connect all odd-numbered and even-numbered physical slots together with traces. Slots 1 and 2 are connected together and the last and the next-to-the-last slots are connected together forming a continuous loop.

Physically the slots are in a straight line, but electrically all the drivers and receivers are in a circle with slots spaced evenly around the circle; a driver in any slot sees the same loading, Berding says.

Signals will arrive at the last load much faster than a previous-generation backplane, which enables systems designers either to operate the backplane faster or move more loads at the same speed.

The second option might be attractive for a VME backplane that now is limited to 21 slots in a 19-inch relay rack, Berding says. A telecommunications-standard 24-inch relay rack has room to place 27 slots. Computer simulations show that a 27-slot backplane made with this invention is still faster than a 21-slot previous-generation backplane.

For more information contact VITA online at www.vita.com.

Easily post a comment below using your Linkedin, Twitter, Google or Facebook account.


The Innovation That Matters™ Quiz

Innovation is one of the key drivers in the Defense industry. View this short video of Leon Woo, VP of Engineering at Mercury Systems, on the role of innovation. Then, answer 3 simple questions correctly to be entered into a drawing to win an Eddie Bauer fleece jacket!

CONGRATULATIONS TO OUR TWO MOST RECENT WINNERS. "Nick from SPARWAR" and "Bridget from AOC."


Military & Aerospace Photos

Related Products

RR2P Removable Canister RAID System

Transportable data storage for mobile field use aboard planes, ships and ground transport. 2U, du...

API DC Link Power Film Capacitors

High reliability DC link capacitors for power inverter applications which require superior life e...

XPort9200 Conduction- or Air-Cooled 12-Channel High-Speed CAN Bus XMC or PMC

The XPort9200 is a conduction- or air-cooled 12-channel CAN bus XMC or PMC module. Each high-spee...

Related Companies

Winchester Systems Inc

At its founding in 1981, Winchester Systems introduced its first 5 MB disk system for Intel development system users....

API Technologies Corp

Who We Are API Technologies is a dominant technology provider of RF/microwave, microelectronics, and security technol...

Extreme Engineering Solutions Inc (X-ES)

 Extreme Engineering Solutions, Inc. (X-ES) is a leader in the design, manufacture, and support of standard and ...
Wire News provided by   

Most Popular Articles

Webcasts

Meeting the Gen3 backplane challenge with OpenVPX and COTS

Tight Pentagon budgets mean military systems must stay in the field for longer than ever before. This doesn't mean obsolete technology, however. Today's military electronics are being upgraded constantly, an...
Sponsored by:

Digital signal processing for signals intelligence and electronic warfare

Military & Aerospace Electronics presents an expert Webcast on the design considerations for blending general-purposes processors (GPUs), general-purpose graphics processors (GPGPUs), field-programmable ...
Sponsored by:

Advantages of Intel Architecture Products and Wind River Solutions in Military & Aerospace Applications

This webinar explains the individual advantages of the Intel Architecture hardware, available for long-life supply, and the WRS software portfolio.  There are extraordinary advantages of combining such ...
Sponsored by:

social activity

All Access Sponsors


Mil & Aero Magazine

February 2014
Volume 25, Issue 2
file

Download Our Apps



iPhone

iPad

Android

Follow Us On...



Newsletters

Military & Aerospace Electronics

Weekly newsletter covering technical content, breaking news and product information
SUBSCRIBE

Defense Executive

Monthly newsletter covering business news and strategic insights for executive managers
SUBSCRIBE

Embedded Computing Report

Monthly newsletter covering news on embedded computing in aerospace, defense and industrial-rugged applications
SUBSCRIBE

Unmanned Vehicles

Monthly newsletter covering news updates for designers of unmanned vehicles
SUBSCRIBE