A Coherent Hybrid SRAM and STT-RAM L1 Cache Architecture for Shared Memory Multicores

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Provided by: Institute of Electrical & Electronic Engineers
Topic: Storage
Format: PDF
STT-RAM is an emerging NVRAM technology that promises high density, low energy and a comparable access speed to conventional SRAM. This paper proposes a hybrid L1 cache architecture that incorporates both SRAM and STT-RAM. The key novelty of the proposal is the exploition of the MESI cache coherence protocol to perform dynamic block reallocation between different cache partitions. Compared to the pure SRAM-based design, the authors' hybrid scheme achieves 38% of energy saving with a mere 0.8% IPC degradation while extending the lifespan of STTRAM partition at the same time.
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