Paper Abstract and Keywords |
Presentation |
2014-08-04 10:50
A 28nm High-k/MG Heterogeneous Multi-Core Mobile Application Processor with 2GHz Cores and Low-Power 1GHz Cores Mitsuhiko Igarashi, Toshifumi Uemura, Ryo Mori, Hiroshi Kishibe, Masaaki Taniguchi, Kohei Wakahara, Toshiharu Saito, Masaki Fujigaya, Kazuki Fukuoka, Koji Nii, Takeshi Kataoka, Toshihiro Hattori (Renesas Electronics) SDM2014-64 ICD2014-33 Link to ES Tech. Rep. Archives: SDM2014-64 ICD2014-33 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
This paper presents power management and low power techniques of our heterogeneous quad/octa-core mobile application processor (AP). This AP has a combination of high-performance 2 GHz cores and energy-efficient 1 GHz cores. The maximum performance in the octa-core configuration is 35,600 DMIPS. The key design highlights are: 1) Using a dedicated PLL and H-tree clock in the high-performance CPU achieves both 2GHz operation and reduced dynamic power. 2) A low-leakage SRAM in a 28nm High-k/MG process is used and the leakage current of the peripheral circuits of the SRAM macro is optimized via multiple threshold voltages (Vt) and gate lengths (Lg), result in 24% leakage reduction of L1 cache. 3) The effects of process and voltage variations are accurately corrected by an on-chip process sensor and direct sensing of the voltage in the power mesh of the chip. 20% dynamic power reduction, 29% leakage power reduction and 40mV improvement of minimum operation voltage are achieved. 4) An enhanced CPU clock control mechanism is employed, which uses an on-chip delay sensor to reduce AC IR drop. 5) The heterogeneous CPU architecture maintains high performance even during thermal throttling. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
Heterogeneous CPU architecture / H-tree clock structure / Adaptive voltage scaling (AVS) / Dynamic Frequency Scaling (DFS) / Thermal control technique / Multi-Vt / Multi-Lg / |
Reference Info. |
IEICE Tech. Rep., vol. 114, no. 175, ICD2014-33, pp. 11-16, Aug. 2014. |
Paper # |
ICD2014-33 |
Date of Issue |
2014-07-28 (SDM, ICD) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
Download PDF |
SDM2014-64 ICD2014-33 Link to ES Tech. Rep. Archives: SDM2014-64 ICD2014-33 |
|