"Radiation Tolerant Intelligent Memory Stack (RTIMS) Testing Methodologies and Results"

Jeffrey Herath, Tak-kwong Ng, Walter Babel and Mark Jones
NASA Langley Research Center


The Radiation Tolerant Intelligent Memory Stack (RTIMS), suitable for both geostationary and low earth orbit missions, has been developed into a self-contained “flight-like” module (TRL 6) in 2006.  

RTIMS provides reconfigurable circuitry and 2 gigabits of error corrected or 1 gigabit of triple redundant digital memory in a small package. RTIMS utilizes circuit stacking of heterogeneous components and radiation shielding technologies. A reprogrammable field programmable gate array (FPGA), six synchronous dynamic random access memories, linear regulator, and the radiation mitigation circuitries are stacked into a module of 42.7mm x 42.7mm x 13.00mm.  

Triple module redundancy, current limiting, configuration scrubbing, and single event function interrupt detection are employed to mitigate radiation effects. The mitigation techniques significantly simplify system design. RTIMS is well suited for deployment in real-time data processing, reconfigurable computing, and memory intensive applications. 

This paper discusses the environmental testing methods and results including radiation testing as well as the architecture of RTIMS and the mitigation techniques.


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