NAND01GR3A datasheet(15/57 Pages) STMICROELECTRONICS

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NAND128-A, NAND256-A, NAND512-A, NAND01G-A

MEMORY ARRAY ORGANIZATION

The memory array is made up of NAND structures

where 16 cells are connected in series.

The memory array is organized in blocks where

each block contains 32 pages. The array is split

into two areas, the main area and the spare area.

The main area of the array is used to store data

whereas the spare area is typically used to store

Error correction Codes, software flags or Bad

Block identification.

In x8 devices the pages are split into a main area

with two half pages of 256 Bytes each and a spare

area of 16 Bytes. In the x16 devices the pages are

split into a 256 Word main area and an 8 Word

spare area. Refer to Figure 10., Memory Array Or-

ganization.

Bad Blocks

The NAND Flash 528 Byte/ 264 Word Page devic-

es may contain Bad Blocks, that is blocks that con-

tain one or more invalid bits whose reliability is not

guaranteed. Additional Bad Blocks may develop

during the lifetime of the device.

The Bad Block Information is written prior to ship-

ping (refer to Bad Block Management section for

more details).

Table 4. shows the minimum number of valid

blocks in each device. The values shown include

both the Bad Blocks that are present when the de-

vice is shipped and the Bad Blocks that could de-

velop later on.

These blocks need to be managed using Bad

Blocks Management, Block Replacement or Error

Correction Codes (refer to SOFTWARE ALGO-

RITHMS section).

Table 4. Valid Blocks

Figure 10. Memory Array Organization

Density of Device

Min

Max

1Gbit

8032

8192

512Mbits

4016

4096

256Mbits

2008

2048

128Mbits

1004

1024

AI07587

Block = 32 Pages

Page = 528 Bytes (512+16)

512 Bytes

Spare

Area

2nd half Page

(256 bytes)

Bytes

Block

8 bits

Bytes

8 bits

Page

Page Buffer, 512 Bytes

1st half Page

(256 bytes)

Block = 32 Pages

Page = 264 Words (256+8)

256 Words

Spare

Area

Main Area

Words

16 bits

Words

16 bits

Page Buffer, 264 Words

Block

Page

x8 DEVICES

x16 DEVICES

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