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Exploitations of Multiple Rows Hammering and Retention Time Interactions in DRAM Using X-Ray Radiation

The methodological approach of hammering multiple rows is newly proposed to evaluate today's SDRAMs, employed with in-DRAM mitigation circuits. The multiple rows are selected based on the one-row hammering test (single row hammering without refresh commands) and are exploited to defeat the empl...

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Published in:IEEE access 2021, Vol.9, p.137514-137523
Main Authors: Yun, Donghyuk, Park, Myungsang, Bak, Geunyong, Baeg, Sanghyeon, Wen, Shi-Jie
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creator Yun, Donghyuk
Park, Myungsang
Bak, Geunyong
Baeg, Sanghyeon
Wen, Shi-Jie
description The methodological approach of hammering multiple rows is newly proposed to evaluate today's SDRAMs, employed with in-DRAM mitigation circuits. The multiple rows are selected based on the one-row hammering test (single row hammering without refresh commands) and are exploited to defeat the employed mitigation algorithm. We irradiated the target sample using an X-ray to observe the reactions of the mitigation circuit when various combinations of multiple rows are hammered. The results showed a four times reduction in the number of hammering thresholds under the one-row hammering test. The same radiated sample showed no errors when one or a few rows were hammered due to the built-in mitigation circuit. However, multiple rows hammering (MRH) demonstrated its effectiveness by generating errors despite an active mitigation circuit. In this paper, we explore the X-ray damage results in the aging of the DRAM sample and induces vulnerabilities from the row hammering error perspective. Also, we use the error bits detected by MRH to investigate the coverage pitfalls of the mitigation circuit employed in the sample DRAM. Finally, we newly evaluate the remaining retention time under row hammering stress to explain the coverage loss in the mitigation strategy based solely on hammering counts.
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subjects Algorithms
Circuits
data retention
DDR3L SDRAM
DDR4 SDRAM
Degradation
Dynamic random access memory
Error analysis
Error detection
Field programmable gate arrays
Frogs
multiple rows hammering
one-row hammering
Radiation effects
Random access memory
Silicon
Stress
Temperature control
X-rays
title Exploitations of Multiple Rows Hammering and Retention Time Interactions in DRAM Using X-Ray Radiation
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