CPR: Correlation-based Page Remapping

As the number of multimedia IPs in mobile devices increases, a high memory bandwidth becomes essential. To meet this demand, Application Processors (APs) employ multiple memory channels. However, employing fine-grained channel interleaving leads to frequent bank conflicts in DRAM, resulting in increased energy consumption and reduced battery life. This paper proposes a novel Virtual to Physical address mapping (VA-to-PA) scheme, called Correlation-based Page Remapping (CPR). This technique involves remapping pages based on the access correlations between them to enhance bank parallelism. By increasing the channel interleaving size to 1KB and applying CPR, we can reduce the DRAM energy consumption of activation (ACT) and precharge (PRE) operations by 15% without any decrease in DRAM performance.