System-level hardware-based protection of memories against soft-errors

  • Authors:
  • Valentin Gherman;Samuel Evain;Mickaël Cartron;Nathaniel Seymour;Yannick Bonhomme

  • Affiliations:
  • Laboratoire de Fiabilisation des Systèmes Embarqués, Gif-sur-Yvette, France;Laboratoire de Fiabilisation des Systèmes Embarqués, Gif-sur-Yvette, France;Laboratoire de Fiabilisation des Systèmes Embarqués, Gif-sur-Yvette, France;Laboratoire de Fiabilisation des Systèmes Embarqués, Gif-sur-Yvette, France;Laboratoire de Fiabilisation des Systèmes Embarqués, Gif-sur-Yvette, France

  • Venue:
  • Proceedings of the Conference on Design, Automation and Test in Europe
  • Year:
  • 2009

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Abstract

We present a hardware-based approach to improve the resilience of a computer system against the errors occurred in the main memory with the help of error detecting and correcting (EDAC) codes. Checksums are placed in the same type of memory locations and addressed in the same way as normal data. Consequently, the checksums are accessible from the exterior of the main memory just as normal data and this enables implicit fault-tolerance for interconnection and solidstate secondary storage sub-systems. A small hardware module is used to manage the sequential retrieval of checksums each time the integrity of the data accessed by the processor sub-system needs to be verified. The proposed approach has the following properties: (a) it is cost efficient since it can be used with simple storage and interconnection sub-systems that do not possess any inherent EDAC mechanism, (b) it allows on-line modifications of the memory protection levels, and (c) no modification of the application software is required.