NAND Flash Memories Application Note

NAND flash technology enables memory manufacturers to produce memory devices with high density at

low cost. From that reason, NAND flash memories are very popular in various electronic equipments that need to

store a large amount of data, such as music players, cameras, mobile phones, PDAs and many others.

There are several important differences between (traditional) NOR and NAND flash memories, widely

discussed through world-wide-web articles and forums. The most evident one is the presence of invalid blocks in

NAND flash memory device. It means that not whole device address range can be used for data storage. Some

memory locations are defective and cannot be programmed and read reliably. However, these defective locations

don't affect the reliability of the rest of memory device.

There must various precautions been taken into account to cope with that defective locations, already in

development phase of the target product. The set of such precautions can be called “pre-programming scheme”.

This application note tries to explain all aspects of NAND flash factory pre-programming. Please, read it carefully

before you contact us as and ask for special support for your NAND flash project. It will help you to provide us with

all information that we need for successful implementation, in exact and accurate form. This will help us to

implement your needs in as short time as possible, that will further reduce your pre-production costs.

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