Making the switch from NOR to NAND flash
EE Times: Making the switch from NOR to NAND flash | |
Raz Dan (07/11/2005 10:00 AM EDT) URL: http://www.eetimes.com/showArticle.jhtml?articleID=165700693 | |
Third-generation networks require a new type of memory for an ever-growing range of multimedia applications, including multimedia messaging service (MMS), high-resolution cameras, photo albums, streaming video, MPEG-4 video, MP3 and streaming audio, 3-D games, Java applications and Web browsing. Increasingly, legacy NOR flash memory in feature phones is being replaced with higher-capacity NAND flash, capable of achieving the required performance and reliability to handle all this data.
The shift from NOR to NAND flash is not always smooth. Though cost-effective and much higher in performance, NAND is considered unreliable and complicated to manage. In fact, when used in cards, NAND is always accessed through a controller inside the card. The recent introduction of multilevel cell (MLC) NAND has furthered the cost advantage of NAND but has also increased the design challenges. To provide the cost, size and performance benefits of NAND flash with a legacy-compatible interface and boot support, Samsung now offers NAND, and M-Systems and Toshiba offer MLC NAND, in embedded-flash disks. Here are guidelines for developers who are interested in migrating from NOR to NAND flash with minimum risk and fast time-to-market. DO
DON'T
Raz Dan (raz.dan@m-systems.com), vice president of customer support for M-Systems (Kfar Saba, Israel)
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