Robin: Incremental Oblique Interleaved Ecc For Reliability Improvement In Stt-Mram Caches

Spin-Transfer Torque Magnetic RAM (STT-MRAM) is a promising alternative for SRAMs in on-chip cache memories. Besides all its advantages, high error rate in STT-MRAM is a major limiting factor for on-chip cache memories. In this paper, we first present a comprehensive analysis that reveals that the conventional ErrorCorrecting Codes (ECCs) lose their efficiency due to data-dependent error patterns, and then propose an efficient ECC configuration, socalled ROBIN, to improve the correction capability. The evaluations show that the inefficiency of conventional ECC increases the cache error rate by an average of 151.7% while ROBIN reduces this value by more than 28.6x.