TY - GEN
T1 - Reducing LDPC Soft Sensing Latency by Lightweight Data Refresh for Flash Read Performance Improvement
AU - Du, Yajuan
AU - Li, Qiao
AU - Shi, Liang
AU - Zou, Deqing
AU - Jin, Hai
AU - Xue, Chun Jason
N1 - Publisher Copyright:
© 2017 ACM.
PY - 2017/6/18
Y1 - 2017/6/18
N2 - In order to relieve reliability problem caused by technology scaling, LDPC codes have been widely applied in flash memories to provide high error correction capability. However, LDPC read performance slowdown along with data retention largely weakens the access speed advantage of flash memories. This paper considers to apply the concept of refresh, that were used for flash lifetime improvement, to optimize flash read performance. Exploiting data read characteristics, this paper proposes LDR, a lightweight data refresh method, that aggressively corrects errors in read-hot pages with long read latency and reprograms error-free data into new pages. Experimental results show that LDR can achieve 29% read performance improvement with only 0.2% extra P/E cycles on average, which causes negligible overhead on flash lifetime.
AB - In order to relieve reliability problem caused by technology scaling, LDPC codes have been widely applied in flash memories to provide high error correction capability. However, LDPC read performance slowdown along with data retention largely weakens the access speed advantage of flash memories. This paper considers to apply the concept of refresh, that were used for flash lifetime improvement, to optimize flash read performance. Exploiting data read characteristics, this paper proposes LDR, a lightweight data refresh method, that aggressively corrects errors in read-hot pages with long read latency and reprograms error-free data into new pages. Experimental results show that LDR can achieve 29% read performance improvement with only 0.2% extra P/E cycles on average, which causes negligible overhead on flash lifetime.
KW - Data Refresh
KW - Flash Read Performance
KW - LDPC Codes
UR - https://www.scopus.com/pages/publications/85023639758
U2 - 10.1145/3061639.3062309
DO - 10.1145/3061639.3062309
M3 - 会议稿件
AN - SCOPUS:85023639758
T3 - Proceedings - Design Automation Conference
BT - Proceedings of the 54th Annual Design Automation Conference 2017, DAC 2017
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 54th Annual Design Automation Conference, DAC 2017
Y2 - 18 June 2017 through 22 June 2017
ER -