IEICE Transactions on Electronics
Online ISSN : 1745-1353
Print ISSN : 0916-8524
Special Section on Solid-State Circuit Design - Architecture, Circuit, Device and Design Methodology
Initialize and Weak-Program Erasing Scheme for High-Performance and High-Reliability Ferroelectric NAND Flash Solid-State Drive
Kousuke MIYAJIRyoji YAJIMATeruyoshi HATANAKAMitsue TAKAHASHIShigeki SAKAIKen TAKEUCHI
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2012 Volume E95.C Issue 4 Pages 609-616

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Abstract

Initialize and weak-program erasing scheme is proposed to achieve high-performance and high-reliability Ferroelectric (Fe-) NAND flash solid-state drive (SSD). Bit-by-bit erase VTH control is achieved by the proposed erasing scheme and history effects in Fe-NAND is also suppressed. History effects change the future erase VTH shift characteristics by the past program voltage. The proposed erasing scheme decreases VTH shift variation due to history effects from ±40% to ±2% and the erase VTH distribution width is reduced from over 0.4V to 0.045V. As a result, the read and VPASS disturbance decrease by 42% and 37%, respectively. The proposed erasing scheme is immune to VTH variations and voltage stress. The proposed erasing scheme also suppresses the power and bandwidth degradation of SSD.

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© 2012 The Institute of Electronics, Information and Communication Engineers
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