A preactivating mechanism for a VT-CMOS cache using address prediction

It has become an important requirement to achieve high performance and low-power consumption at the same time. The dynamic leakage cut-off (DLC) scheme, which controls transistors´ threshold voltage by the line on demand, is a technique that potentially satisfies that requirement for a cache. Yet, conventional DLC causes access time to significantly lengthen, and consequently processor performance is unacceptably degraded. This paper proposes a mechanism that suppresses the performance degradation by preactivating cache lines using address prediction before access requests. Our evaluation results show significant performance improvements are achieved with little increase of power consumption.