An Efficient Parity Rearrangement Coding Scheme for RRAM Thermal Crosstalk Effects

Resistive random access memory (RRAM) is a high-performance nonvolatile memory with the feature of small area, low operation voltage, and good compatibility. However, when frequent writing operation at high density integration, the crosstalk problem will seriously influence the retention properties of RRAM, which is common to create some error flips in serious conditions. Therefore, we present an effective parity rearrangement coding scheme, that is PRCoder, to reduce the influence in RRAM. We present the PRCoder at algorithm level and emulate it at hardware level for various scenarios. Experiments indicate that PRCoder can decrease the accidentally flips by about 32.7% on average, which is caused by thermal crosstalk, with just one additional bit of redundancy per storage line. Moreover, PRCoder causes an ignorable performance spending of ~0.3% with inferior to 0.008% extra RRAM area.