UM1653 datasheet(9/45 Pages) STMICROELECTRONICS

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UM1653

STM32 NAND driver blocks

1.4

NAND architecture

NAND is a non-volatile Flash memory device where address lines are multiplexed with data

input/output as well as with commands input.



NAND Flash consists of a number of blocks. Each block consists of a number of pages,

typically 32 or 64.



Pages can be written individually, one at a time. When writing to a page, bits can only

be written from 1 to 0.



The erase operation is done by block. Erase operation makes all the memory bits of all

the pages in the block to logical 1.

The small NAND Flash contains 528-byte pages (512 data area and 16 byte spare area).

The page size for 2K NAND is 2112 (2048 data and 64 spare area).

The page size for 4K NAND is 4224 (4096 data and 128 spare area).

The page size for 8K NAND is 8448 (8192 data and 256 spare area).

Figure 3. NAND block architecture

The spare area contains information about the page and the code error correction:

For small page (512 + 16 Byte) NAND Flash:

For Large page (2048 + 64 Byte) NAND Flash:

Table 1. Spare area format for small NAND Flash

Logical Index

Block Status

Data Status

Wear Leveling counter

ECC

Table 2. Spare area format for large NAND Flash

Block Status

Data Status

Logical Index

Wear Leveling counter

ECC

MS33217V1

Page 0

Page 1

Page m

Physical block

Block 0

Block 1

Block N

Block N-1

Physical zone

Data

Spare area

Data

Spare area

2K Physical pages

512 Physical page (unit)

0x000

0x83F

0X000

0x200

0x20F

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