Paper Abstract and Keywords |
Presentation |
2021-12-01 10:35
Energy saving in a multi-context coarse grained reconfigurable array with non-volatile flip-flops Aika Kamei, Takuya Kojima, Hideharu Amano (Keio Univ.), Daiki Yokoyama, Hisato Miyauchi, Kimiyoshi Usami (SIT), Keizo Hiraga, Kenta Suzuki (SSS) VLD2021-20 ICD2021-30 DC2021-26 RECONF2021-28 Link to ES Tech. Rep. Archives: ICD2021-30 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
IoT and edge-computing have been attracting much attention and demands for power efficiency as well as high performance for battery-driven devices has been increasing. Many IoT applications requires edge-devices to operate intermittently at a high frequent manner yet exhausting leakage power even on standby period. Newly proposed non-volatile cool mega array with multi-context (NVCMA/MC) — one of low-power oriented coarse-grained reconfigurable accelerators — has a non-volatile flip-flop (NVFF) with magnetic tunnel junction (MTJ) and supports power gating (PG) to reduce leakage power efficiently. NVCMA/MC is an extended version of the conventional NVCMA and facilitates the optimization of the trade-off between power and performance by enlarging the processing element (PE) array and inserting pipeline registers between each row of the PE. Newly added multi-context memories which perform task-level reconfiguration can take advantage of NVFF by efficient runtime PG. Evaluation of real chips implemented with 40nm MTJ/MOS hybrid process technology demonstrates that 65% of store energy is reduced by dividing store operation into two steps — 35 ns of short store and 140 ns of long store. With multi-context power gating, we also found that applications that run intermittently for intervals as short as around 3μs can benefit from the PG effect. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
CGRA / coarse-grained reconfigurable architecture / nonvolatile memory / magnetic tunnel junction / power gating / / / |
Reference Info. |
IEICE Tech. Rep., vol. 121, no. 277, VLD2021-20, pp. 19-24, Dec. 2021. |
Paper # |
VLD2021-20 |
Date of Issue |
2021-11-24 (VLD, ICD, DC, RECONF) |
ISSN |
Online edition: ISSN 2432-6380 |
Copyright and reproduction |
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VLD2021-20 ICD2021-30 DC2021-26 RECONF2021-28 Link to ES Tech. Rep. Archives: ICD2021-30 |
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