Publication: Statistical Anomalies of Bitflips in SRAMs to Discriminate SBUs from MCUs
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Publication Date
2016-08
Authors
Villa, Francesca
Baylac, Maud
Rey, Solenne
Agapito Serrano, Juan Andrés
Puchner, Helmut
Hubert, Guillaume
Velazco, Raoul
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Publisher
IEEE
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Abstract
Recently, the occurrence of multiple events in static tests has been investigated by checking the statistical distribution of the difference between the addresses of the words containing bitflips. That method has been successfully applied to Field Programmable Gate Arrays (FPGAs) and the original authors indicate that it is also valid for SRAMs. This paper presents a modified methodology that is based on checking the XORed addresses with bitflips, rather than on the difference. Irradiation tests on CMOS 130 & 90 nm SRAMs with 14-MeV neutrons have been performed to validate this methodology. Results in high-altitude environments are also presented and cross-checked with theoretical predictions. In addition, this methodology has also been used to detect modifications in the organization of said memories. Theoretical predictions have been validated with actual data provided by the manufacturer.
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