Reliable ultra-low voltage cache with variation-tolerance

In this paper, an ultra-low voltage cache with improved variation-tolerance is proposed. A fast and stable adaptive mechanism, able to dynamically adjust error control strength, is designed to make the cache more resilient to supply voltage variations. Our proposed method shows a 10X improvement in residual error rate at ultra-low voltage, compared to an adaptive ECC method. It also reduces residual error rate by 3X compared to variable strength ECC method at low voltage operation and has less storage overhead.