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The reliability of semiconductor RAM memories with on-chip error-correction coding

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2 Author(s)
Goodman, R.M. ; California Inst. of Technol., Pasadena, CA, USA ; Sayano, M.

The mean lifetimes are studied of semiconductor memories that have been encoded with an on-chip single error-correcting code along each row of memory cells. Specifically, the effects of single-cell soft errors and various hardware failures (single-cell, row, column, row-column, and entire chip) in the presence of soft-error scrubbing are examined. An expression is presented for computing the mean time to failure of such memories in the presence of these types of errors using the Poisson approximation; the expression has been confirmed experimentally to accurately model the mean time to failure of memories protected by single error-correcting codes. These analyses will enable the system designer to accurately assess the improvement in mean time to failure (MTTF) achieved by the use of error-control coding.

Published in:

Information Theory, IEEE Transactions on  (Volume:37 ,  Issue: 3 )

Date of Publication:

May 1991

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