Online Correction of Hard Errors and Soft Errors via One-Step Decodable OLS Codes for Emerging Last Level Caches

摘要

The number of marginal cells in static random-access memory (SRAM) increases as technology scales further. Spin transfer torque magnetic random-access memory (STT-MRAM) which is gaining popularity as a L3 cache alternative due to their small size, nonvolatility, high endurance, fast speed, scalability and low power consumption, also suffers from various stochastic and process variations causing both hard-errors and soft-errors in field. Orthogonal Latin Square (OLS) codes have been conventionally used in SRAMs for their low latency decoding. In this paper, an error-correcting scheme is proposed based on OLS codes which corrects both hard- errors and soft-errors simultaneously in a single step. The idea proposed is that in general a t-error correcting OLS code can be modified so that it can correct a certain number (t