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- W2205576369 abstract "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 multiple refresh periods and small refresh blocks to reduce DRAM dissipation by decreasing the number of cells refreshed too often. Long periods are used to accommodate cells with small leakage. In contrast to conventional row-based refresh, small refresh blocks are used to increase worst-case data retention times. 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 possible implementation of our refresh scheme. In simulations with a 16 Mb DRAM, block-based multi-rate refresh reduces standby dissipation by a multiplicative factor of 4 with area overhead below 6%." @default.
- W2205576369 created "2016-06-24" @default.
- W2205576369 creator A5041839124 @default.
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- W2205576369 date "2002-11-13" @default.
- W2205576369 modified "2023-09-23" @default.
- W2205576369 title "Block-based multi-period refresh for energy efficient dynamic memory" @default.
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- W2205576369 doi "https://doi.org/10.1109/asic.2001.954696" @default.
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