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Alternatives to Using NAND Flash White Paper

文档内容介绍:
文档名称 :Alternatives to Using NAND Flash White Paper
文档格式 :pdf
发 布 者 :M-Systems
语  言 :英文
更新日期 :2007-9-20
本文档共10页。
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详细信息 >>

内容简介 :
INTRODUCTION
The popularity of feature phones, camera phones, MP3 players, video-on-demand, and other new applications is on the rise. In a saturated handset market, handset vendors are pushed by the carrier’s desire to increase ARPU and by their own need to drive users to upgrade their handsets. As a result, all handset manufacturers carry new data-centric devices offering rich multimedia and productivity features aimed at savvy business customers and the “trendy” teenager segment. Many of these devices have complex operating systems, large suites of applications and a large amount of memory for user data. More and more, this memory is NAND flash-based as opposed to NOR flash-based. But among the NAND solutions, there are many implementation
alternatives offering different merits and challenges.

WHY NAND IS BECOMING A MUST IN MOBILE PHONES
Two main technologies (Figure 1) dominate the non-volatile flash memory market today: NOR
and NAND. Until recently hardware engineers were unfamiliar with the differences between the
architectures of these two technologies, but this is no longer the case.


Figure 1: Comparing NOR and NAND Flash Architectures

While NOR offers eXecute In Place (XIP) capabilities and high read performance, it is expensive per MB, thus mostly cost-effective in low capacities (1MB-4MB). Another disadvantage of NOR is its extremely low write and erase performance. NAND architecture, on the other hand, offers high cell densities and high capacity, combined with fast write and erase rates. But since it is accessed in blocks of 512MByte (called pages) it cannot be used for XIP, has inherent bad blocks and is prone to low reliability due to random errors generated by physical effects in the geometry of the NAND gates.......

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