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March 10, 2008

Mtg: Nonvolatile Erasable Flash NAND Memories

by @ 8:29 pm. Filed under ALL, Communications, Computers/Software, Electronics Design, Engineering Mgmt, Semiconductors

SCV Solid State Circuits Chapter
Speaker: Raul-Adrian Cernea, SanDisk Corporation
Time: Refreshments at 6:00 PM; Presentation at 6:30 PM
Cost: small donation for food
Place: National Semiconductor Building E, Auditorium, 2900 Semiconductor Dr., Santa Clara
RSVP: not required

Abstract Examination of NAND memories in general as well as the latest architecture accomplishments, based on three 2008 ISSCC papers jointly presented by SanDisk and Toshiba, are the subjects of this presentation. ? The NAND Flash cell resides at the core of various types of memory cards. This memory cell represents the latest technological achievement when low cost and high performance are of concern. ? The basics of the erase and program operations are presented and the NAND chain functionality is explained. ? All Bit Line (ABL) access has multiple advantages when higher programming throughput is targeted and it was made possible by adopting “current sensing” contrary to a “conventional” voltage sensing scheme. ? General chip architecture is presented and a double-size data buffer is found to be necessary for All Bit Line operation, while the area increase is a disadvantage. Changes are necessary to counterbalance the area increase. ? Hierarchical column architecture is of foremost importance. ? Optimization of other circuits is also helping. ? A different type of charge pump is one such example brought to attention. ? Fast data in and data out access rate are essential, and some ways of boosting them are mentioned, including a new redundancy scheme. ? A very important method of cost reduction is multiple level encoding. ? Single level versus multiple level encoding is discussed and the latest three-bit-per-cell circuit is presented. ? Some algorithms that made it possible are shown. ? The performance drop is also pointed out. ? Energy savings is another topic of the presentation.

The presentation ends with conclusions and acknowledgements.

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