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Many mobile SoC chips employ a “two-macro” approach including volatile and nonvolatile memory macros (i.e. SRAM and Flash), to achieve high-performance or low-voltage power-on operation with the capability of power-off nonvolatile data storage. However, the two-macro approach suffers from slow store/restore speeds due to word-by-word serial transfer of data between the volatile and nonvolatile memories...
This work demonstrates the first fabricated macro-level RRAM-based nonvolatile SRAM (nvSRAM) that use a new 8T2R (Rnv8T) cell to achieve fast NVM storage and low VDDmin read/write operations. The Rnv8T cell uses two fast-write low-current RRAM devices, 3D stacked over the 8T, to achieve low store energy with a compact cell area (1.6x that of a 6T cell). A 2T RRAM-switch provides both RRAM control...
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