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Efficient Policy for ECC Parity Storing of NAND Flash Memory

낸드플래시 메모리의 효율적인 ECC 패리티 저장 방법

  • 김석만 (충북대학교 전자정보대학 정보통신공학과) ;
  • 오민석 (충북대학교 전자정보대학 정보통신공학과) ;
  • 조경록 (충북대학교 전자정보대학 정보통신공학과)
  • Received : 2016.08.11
  • Accepted : 2016.09.29
  • Published : 2016.10.28

Abstract

This paper presents a new method of parity storing for ECC(error correcting code) in SSD (solid-state drive) and suitable structure of the controller. In general usage of NAND flash memory, we partition a page into data and spare area. ECC parity is stored in the spare area. The method has overhead on area and timing due to access of the page memory discontinuously. This paper proposes a new parity policy storing method that reduces overhead and R(read)/W(write) timing by using whole page area continuously without partitioning. We analyzed overhead and R/W timing. As a result, the proposed parity storing has 13.6% less read access time than the conventional parity policy with 16KB page size. For 4GB video file transfer, it has about a minute less than the conventional parity policy. It will enhance the system performance because the read operation is key function in SSD.

Keywords

SSD Controller;ECC;Parity Policy

Acknowledgement

Supported by : 충북대학교

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