AN4570 datasheet(30/46 Pages) STMICROELECTRONICS

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Interfacing with an 8-bit NAND Flash memory

AN4570

30/46

DocID026804 Rev 1

Interfacing with an 8-bit NAND Flash memory

NAND Flash memories are accessed in accordance with a specific protocol. To write to or

read from the NAND Flash memory, it is necessary to:

Send a command to the NAND Flash memory

Send the address to write to or read from

Read or write the data

The FMC NAND banks are divided into three sections to allow the user to easily program

the NAND Flash memory: data section, address section, and command section.

Figure 9. FMC NAND bank sections

In fact, the three sections are the representation of the real NAND Flash memory. By writing

to any location in the command section, the user writes the command to the NAND Flash

memory. By writing to any location in the address section, the user specifies the address of

the read or write operation. Depending on the structure of the used NAND Flash memory,

four or five operations are required to write the address. By writing to or reading from any

location in the data section, the data are written to or read from the address previously sent

to the address section.

Command section

Address section

Data section

0x02 0000

0x03 FFFF

0x01 0000

0x00 0000

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