Per-bank refresh with adaptive early termination for high density DRAM
- Authors
- Yang, Hyun-Woong; Lee, Min-Kyu; Chung, Ki Seok
- Issue Date
- Nov-2018
- Publisher
- Association for Computing Machinery
- Keywords
- DRAM refresh; Low power DRAM; Memory architecture
- Citation
- ACM International Conference Proceeding Series, pp.169 - 173
- Indexed
- SCOPUS
- Journal Title
- ACM International Conference Proceeding Series
- Start Page
- 169
- End Page
- 173
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/4655
- DOI
- 10.1145/3290420.3290442
- ISSN
- 0000-0000
- Abstract
- DRAM, which is mainly used as main memory, requires a refresh operation to maintain the integrity of stored data. Since memory read and write operations to a bank are not allowed while the bank is being refreshed, a lot of memory accesses may be blocked due to refresh, which may lead to significant performance degradation. Therefore, a lot of active studies to minimize this negative performance impact of refresh have been conducted. In a refresh scheme called per-bank refresh, the refresh unit will be one bank rather than all banks in a rank, allowing memory access to other banks while a certain bank in the same rank is refreshed. However, the per-bank refresh consumes more power than all-bank refresh. In this paper, we propose a per-bank refresh method with adaptive early termination, which allows both the refresh period and the size of each row group to be non-uniformly determined, to increase the efficiency of per-bank refresh and reduce energy consumption. By using this method, compared to the basic all-bank refresh model, the average weighted speed increases by about 6.4% and the energy consumption is reduced by about 51%.
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