App Note

UEI Application Notes:

A Modern Alternative to Reflective Memory and VME

App Note #027

This white paper is divided into two sections. The first provides a brief description of some of the reasons our customers have switched from Reflective Memory and VME based technology to UEI’s Ethernet RACKtangle and Cube I/O chassis. The second part is a case study of theprocess as well as how and why FlightSafety International, a world leader in the design and manufacture of flight simulators, made the switch to UEI.

Introduction

Reflective Memory, and in particular, Reflective Memory in VME chassis has been the standard for real-time DAQ and embedded control systems for years. However, due to the age of most VME technology, as well as the recent consolidation of vendors in the market, many VME users have, or will soon face “end-of-life” issues with their VME solutions. Reflective Memory itself is an older, proprietary technology and may itself be facing end-of-life in the not too distant future. In the meanwhile, new technology from UEI provides the functionality of Reflective Memory in a simpler, less expensive, and more modern architecture. With a 10+ year availability guarantee, UEI’s powerfulRACKtangle I/O system is an ideal replacement fo VME based I/O systems, whether or not they use Reflective Memory technology.

Reflective Memory History

Developed in the 1980’s and popularized for VME systems by VMIC, Reflective Memory is a method for sharing and synchronizing data in multiple chassis. Reflective Memory networks typically provide the deterministic timing required by real-time control systems and at the same time minimize the network load on the chassis CPU. In VME systems, Reflective Memory I/O systems are typically configured with an RM board in each chassis. These Reflective Memory boards are then connected via some type of communications link/network.

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 UEI App Note