Post Doc - Design for reliability for digital circuits

PsD-DRT-18-0010

RESEARCH FIELD
Electronics and microelectronics - Optoelectronics

ABSTRACT
Flash memories are a key enabler for high-temperature applications such as data acquisition and engine control in aerospace, automotive and drilling industries. Unfortunately, the retention time of flash memories is very sensitive to high temperatures. Even at relatively moderated temperatures, flash memories may be affected by retention-related problems especially if they are set to store more than one bit per cell. This impact can be mitigated by periodically refreshing the stored data. The problem is that, in the presence of a variable operating temperature that could be due to variable environmental and workload conditions, a fixed data-refresh frequency may become disproportionately large with a subsequent impact on response time and cycling endurance.The first objective of this project is to implement a data-refresh method based on a specially designed counter that is able to (a) track the evolution of the temperature and its impact on the data retention time of Flash memory blocks, (b) trigger warnings against potential retention time hazards and (c) provide timestamps.The second objective is to find the distribution law that gives the evolution of the number of data retention errors in time. The goal is to implement a methodology able to infer the remaining retention time of flash memory pages based on their data retention age, i.e., the elapsed time since data was stored, and the number of retention and non-retention errors.The publication of the scientific results in high-ranked conferences and journals is major project objective.

LOCATION
Département Architectures Conception et Logiciels Embarqués (LIST-LETI)

Laboratoire Fiabilité et Intégration Capteur

Saclay

CONTACT PERSON
GHERMAN Valentin

CEA

DRT/DACLE//LFSE

Paris-Saclay Campus - Nano-INNOV | Bât. 862-PC172 | F-91191 Gif-sur-Yvette Cedex

Phone number: 01 69 08 48 58

Email: valentin.gherman@cea.fr

START DATE
As soon as possible

« The age limit is 26 years for PhD offers and 30 years old for post-doc offers. »


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