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• W2134727012 abstract "Dynamic random access memorys (DRAMs) are widely used in portable applications due to their high storage density. In standby mode, the main source of DRAM power dissipation is the refresh operation that periodically restores leaking charge in each memory cell to its correct level. Conventional DRAMs use a single refresh period determined by the cell with the largest leakage. This approach is simple but dissipative, because it forces unnecessary refreshes for the majority of the cells with small leakage. In this paper, we investigate a novel scheme that relies on small refresh blocks and multiple refresh periods to reduce DRAM dissipation by decreasing the number of cells refreshed too often. In contrast to conventional row-based refresh, small refresh blocks are used to increase worst case data retention times. Long periods are used to accommodate cells with small leakage. Retention times are further extended by adding a swap cell to each refresh block. We give a novel polynomial-time algorithm for computing an optimal set of refresh periods for block-based multiperiod refresh. Specifically, given an integer K and a distribution of data-retention times, in O(KN/sup 2/) steps our algorithm computes K refresh periods that minimize DRAM dissipation, where N is the number of refresh blocks in the memory. We describe and evaluate a scalable implementation of our refresh scheme whose overhead is asymptotically linear with memory size. In simulations with a 16-Mb DRAM, block-based multiperiod refresh reduces DRAM standby dissipation by a multiplicative factor of 4 with area overhead below 6%. Moreover, our proposed scheme is robust to semiconductor process variations, with power savings degrading no more than 7% over a 20-fold increase of leaky cells." @default.
• W2134727012 created "2016-06-24" @default.
• W2134727012 creator A5041839124 @default.
• W2134727012 creator A5076689613 @default.
• W2134727012 date "2003-12-01" @default.
• W2134727012 modified "2023-10-17" @default.
• W2134727012 title "Block-based multiperiod dynamic memory design for low data-retention power" @default.
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• W2134727012 doi "https://doi.org/10.1109/tvlsi.2003.817524" @default.
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