Application specific non-volatile primary memory for embedded systems

ABSTRACT

Memory subsystems have been considered as one of the most critical components in embedded systems and furthermore, displaying increasing complexity as application requirements diversify. Modern embedded systems are generally equipped with multiple heterogeneous memory devices to satisfy diverse requirements and constraints. NAND flash memory has been widely adopted for data storage because of its outstanding benefits on cost, power, capacity and non-volatility. However, in NAND flash memory, the intrinsic costs for the read and write accesses are highly disproportionate in performance and access granularity. The consequent data management complexity and performance deterioration have precluded the adoption of NAND flash memory. In this paper, we introduce a highly effective non-volatile primary memory architecture which incorporates application specific information to develop a NAND flash based primary memory. The proposed architecture provides a unified non-volatile primary memory solution which relieves design complications caused by the growing complexity in memory subsystems. Our architecture aggressively minimizes the overhead and redundancy of the NAND based systems by exploiting efficient address space management and dynamic data migration based on accurate application behavioral analysis. We also propose a highly parallelized memory architecture through an active and dynamic data redistribution over the multiple flash memories based on run-time workload analysis. The experimental results show that our proposed architecture significantly enhances average memory access cycle time which is comparable to the standard DRAM access cycle time and also considerably prolongs the device life-cycle by autonomous wear-leveling and minimizing the program/erase operations.

REFERENCES

• 1: Jihyun In , Ilhoon Shin , Hyojun Kim, SWL: a search-while-load demand paging scheme with NAND flash memory, Proceedings of the 2007 ACM SIGPLAN/SIGBED conference on Languages, compilers, and tools for embedded systems, June 13-15, 2007, San Diego, California, USA
• 2: Yongsoo Joo , Yongseok Choi , Chanik Park , Sung Woo Chung , EuiYoung Chung , Naehyuck Chang, Demand paging for OneNAND™ Flash eXecute-in-place, Proceedings of the 4th international conference on Hardware/software codesign and system synthesis, October 22-25, 2006, Seoul, Korea [doi>10.1145/1176254.1176310]
• 3: B. Kim, S. Cho, and Y. Choi. OneNAND™: A high performance and low power memory solution for code and data storage. Proceedings of 20th Non-Volatile Semiconductor Workshop, 2004.
• 4: P. R. Panda , F. Catthoor , N. D. Dutt , K. Danckaert , E. Brockmeyer , C. Kulkarni , A. Vandercappelle , P. G. Kjeldsberg, Data and memory optimization techniques for embedded systems, ACM Transactions on Design Automation of Electronic Systems (TODAES), v.6 n.2, p.149-206, April 2001 [doi>10.1145/375977.375978]
• 5: Chanik Park , Junghee Lim , Kiwon Kwon , Jaejin Lee , Sang Lyul Min, Compiler-assisted demand paging for embedded systems with flash memory, Proceedings of the 4th ACM international conference on Embedded software, September 27-29, 2004, Pisa, Italy [doi>10.1145/1017753.1017775]
• 6: Chanik Park , Jaeyu Seo , Sunghwan Bae , Hyojun Kim , Shinhan Kim , Bumsoo Kim, A low-cost memory architecture with NAND XIP for mobile embedded systems, Proceedings of the 1st IEEE/ACM/IFIP international conference on Hardware/software codesign and system synthesis, October 01-03, 2003, Newport Beach, CA, USA [doi>10.1145/944645.944684]
• 7: Peter Petrov , Alex Orailoglu, Energy frugal tags in reprogrammable I-caches for application-specific embedded processors, Proceedings of the tenth international symposium on Hardware/software codesign, May 06-08, 2002, Estes Park, Colorado [doi>10.1145/774789.774826]
• 8: Peter Petrov , Alex Orailoglu, A reprogrammable customization framework for efficient branch resolution in embedded processors, ACM Transactions on Embedded Computing Systems (TECS), v.4 n.2, p.452-468, May 2005 [doi>10.1145/1067915.1067924]

INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.3 SPECIAL-PURPOSE AND APPLICATION-BASED SYSTEMS
      Subjects: Real-time and embedded systems

General Terms:
Design, Experimentation, Performance

Keywords:
application specific information, embedded systems, nand flash memory, non-volatile primary memory, wear-leveling