MT29F4G08ABAEAH4:E - MICRON TECHNOLOGY

Addendum

Valid Blocks and Boot Block Protection

MT29F Series NAND Flash Memory

Introduction

This data sheet addendum specifies that blocks 00h to 07h are guaranteed valid with

ECC when shipped from the factory.

NAND devices are shipped with all blocks unprotected and with standard access to per-

form READ, PROGRAM, and ERASE operations.

Block protection is enabled by the PROTECT command which inhibits PROGRAM and

ERASE operations on up to twelve groups, or a total of 48 blocks.

Block protection is non-volatile. Therefore, a power-on or power-off sequence does not

affect the block status after the PROTECT command is issued. The device ships from the

factory with no blocks protected so that users can program or erase the blocks before

issuing the PROTECT command. Block protection is also irreversible in that when pro-

tection is enabled by the issuing PROTECT command, the protected blocks can no lon-

ger be programmed or erased.

This addendum does not provide detailed information on the devices. The standard

component data sheets provide a complete description of device functionality, operat-

ing modes, and specifications unless specified herein.

Addendum: NAND Valid Blocks and Boot Block Protection

Introduction

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addendum_valid_boot_block_protection_m7xAseries_NAND.pdf - Rev. D 1/16 EN 1Micron Technology, Inc. reserves the right to change products or specifications without notice.

Products and specifications discussed herein are for evaluation and reference purposes only and are subject to change by

Micron without notice. Products are only warranted by Micron to meet Micron's production data sheet specifications. All

information discussed herein is provided on an "as is" basis, without warranties of any kind.

Address Blocks

Table 1: Valid Blocks

Parameter Symbol Device Min Max Unit Notes

Valid block

number

NVB MT29F1G08ABAFAWP-IT:G 1004 1024 Blocks 1, 2

MT29F1G08ABAFAH4-IT:G

MT29F1G08ABBFAH4-IT:G

MT29F2G08ABAFAH4-ITS:F 2008 2048

MT29F2G08ABAFAH4-S:F

MT29F2G08ABAGAWP-IT:G

MT29F2G08ABAGAH4-IT:G

MT29F2G08ABBGAH4-IT:G

MT29F4G08ABAEAH4-ITS:E 4016 4096

MT29F4G08ABAEAH4-S:E

MT29F8G08ABACAH4-ITS:C 8032 8192

MT29F8G08ABACAH4-S:C

Notes: 1. Invalid blocks are blocks that contain one or more bad bits. The device may contain bad

blocks upon shipment. Additional bad blocks may develop over time; however, the total

number of available blocks will not drop below NVB during the endurance life of the

device. Do not erase or program blocks marked invalid by the factory.

2. Blocks 00h to 07h are guaranteed to be valid with ECC when shipped from the factory.

PROTECT Command

The PROTECT command provides non-volatile, irreversible protection of up to twelve

groups, a total 48 blocks. Implementation of the protection is group based, which

means that a minimum of one group (4 blocks) is protected when the PROTECT com-

mand is issued. The PROTECT command includes the steps included in the Address

and Data Cycles table and the Protection Command Details.

(4Ch-03h-1Dh-41h)-80h-addr(00h-00h-00h-0Yh-00h)-10h-tPROG-FFh

These steps are also shown in the Command Definitions – Address and Data Cycles ta-

ble, followed by some details of the steps.

Figure 1: Address and Data Cycles

Cycle type

I/O[7:0]

Command Command Command Command Command Address Address

Address Address Address Command Command

tPROG

4Ch 03h 1Dh 41h 80h 00h 00h

00h 0Yh 00h 10h FFh

Note: 1. In the 4th address cycle, 0Yh is the last 4 bits and represents the group of blocks to be

protected. There are always 12 groups, so Y = 0000b-1011b: Y = 0000 protects Group0 =

Addendum: NAND Valid Blocks and Boot Block Protection

Address Blocks

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blks 0, 1, 2, 3; Y = 0001 protects Group1 = blks 4, 5, 6, 7; Y = 1011 protects Group11 =

blks 44, 45, 46, 47.

PROTECTION Command Details

To enable protection, four bus write cycles set up the 4Ch, 03h, 1Dh, and 41h com-

mands. Next, one bus write cycle sets up the PAGE PROGRAM command (80h).

Then, five bus write cycles are required to input the targeted block group information:

00h, 00h, 00h, 0Yh, 00h. In this 4th address cycle, 0Yh is the last 4 bits and represents the

group of blocks to be protected. There are always 12 Groups, so Y = 0000b-1011b:

• Y = 0000 protects Group0 = blks 0, 1, 2, 3

• Y = 0001 protects Group1 = blks 4, 5, 6, 7

• Y = 1011 protects Group11 = blks 44, 45, 46, 47

One bus cycle is required to issue the PAGE PROGRAM CONFIRM command. After

tProg, the targeted block groups are protected. The EXIT PROTECTION command (FFh)

is issued to ensure the device exits protection mode.

(4Ch-03h-1Dh-41h)-80h-addr(00h-00h-00h-0Yh-00h)-10h-tPROG-FFh

The enable protection step is four bytes wide to prevent implementing involuntary pro-

tection. In addition, any spurious command/address/data cycles between each byte in-

validates the entire process and the next PROGRAM command does not affect the block

protection status. Likewise, any spurious command/address/data cycle between enable

protection and setting up the PAGE PROGRAM command invalidates the entire protec-

tion command process.

If enable protection is followed by an operation other than the PROGRAM operation,

such as a PAGE READ or BLOCK ERASE operation, this other operation is executed

without affecting block protection status. Therefore, the PROTECT operation must still

be executed to protect the block. The PROTECT operation is inhibited if WP# is LOW.

Upon PROTECT operation failure, the status register reports a value of E1h. Upon PRO-

TECT operation success, the status register reports value of E0h.

The following is an example of boot block protection:

Protect group 5 (blks20-23): (4Ch-03h-1Dh-41h)-80h-addr(00h-00h-00h-05h-00h)-10h-

tPROG-FFh

Addendum: NAND Valid Blocks and Boot Block Protection

PROTECT Command

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addendum_valid_boot_block_protection_m7xAseries_NAND.pdf - Rev. D 1/16 EN 3Micron Technology, Inc. reserves the right to change products or specifications without notice.

Revision History

Rev. D – 1/16

• Updated device numbers in Table 1

Rev. C – 6/12

• Updated device numbers in Table 1

Rev. B – 2/12

• Added valid block information

Rev. A – 2/12

• Initial creation.

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Addendum: NAND Valid Blocks and Boot Block Protection

Revision History

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addendum_valid_boot_block_protection_m7xAseries_NAND.pdf - Rev. D 1/16 EN 4Micron Technology, Inc. reserves the right to change products or specifications without notice.