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Circuit techniques for energy-efficient STT MRAM, which is suitable for replacing SRAM L2 cache memories, are proposed. The waking-up from the power-down mode without any cycle penalties becomes possible by eliminating the voltage generator even at higher frequency than 100MHz. The read current variation caused by the generator elimination is mitigated by 50% using the adaptive pulse-driven read current control. The cross-coupled hierarchical switch reduces the unneeded read current by 66% and enhances the read margin.
Memory Workshop (IMW), 2013 5th IEEE International
Date of Conference: 26-29 May 2013