Design of dual-duplex system and evaluation of RAM

We develop the dual-duplex system that detects a fault using a hardware comparator which switches to a hot standby redundancy. This system is designed on the basis of MC68000 and can be used in VMEbus. To improve the reliability and safety, the dual-duplex system is designed in double modular redundancy. The failure rate of the electrical element is calculated in MILSPEC-217F by RELEX6.0 tool, and the system RAMS (reliability, availability, maintainability, safety) and MTTF (mean time to failure) are designed by Markov modeling and evaluated by Matlab. Since the dual-duplex system has high reliability, availability, and safety, it can be applied to embedded control systems like airplanes and high-speed railway systems.