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M29W640DT, M29W640DB

tended Block mode the Boot Blocks are not acces-

sible.

To exit from the Extended Block mode the Exit Ex-

tended Block command must be issued.

The Extended Block can be protected, however

once protected the protection cannot be undone.

Exit Extended Block Command

The Exit Extended Block command is used to exit

from the Extended Block mode and return the de-

vice to Read mode. Four Bus Write operations are

required to issue the command.

Block Protect and Chip Unprotect Commands

Groups of blocks can be protected against acci-

dental Program or Erase. The Protection Groups

are shown in APPENDIX A., Table 19. and Table

20., Bottom Boot Block Addresses, M29W640DB.

The whole chip can be unprotected to allow the

data inside the blocks to be changed.

Block Protect and Chip Unprotect operations are

described in APPENDIX D..

Note: X Don’t Care, PA Program Address, PD Program Data, BA Any address in the Block. All values in the table are in hexadecimal.

The Command Interface only uses A–1, A0-A10 and DQ0-DQ7 to verify the commands; A11-A20, DQ8-DQ14 and DQ15 are Don’t

Command

Bus Write Operations

1st

2nd

3rd

4th

5th

6th

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Addr

Data

Read/Reset

1X

F0

3555

AA

2AA

55

X

F0

Auto Select

3

555

AA

2AA

55

555

90

Program

4

555

AA

2AA

55

555

A0

PA

PD

Double Word Program

3

555

50

PA0

PD0

PA1

PD1

Unlock Bypass

3

555

AA

2AA

55

555

20

Unlock Bypass

Program

2

X

A0

PA

PD

Unlock Bypass Reset

2

X

90

X

00

Chip Erase

6

555

AA

2AA

55

555

80

555

AA

2AA

55

555

10

Block Erase

6+

555

AA

2AA

55

555

80

555

AA

2AA

55

BA

30

Erase Suspend

1

X

B0

Erase Resume

1

X

30

Read CFI Query

1

55

98

Enter Extended Block

3

555

AA

2AA

55

555

88

Exit Extended Block

4

555

AA

2AA

55

555

90

X

00

Command

Bus Write Operations

1st

2nd

3rd

4th

5th

6th

Add

Data

Add

Data

Add

Data

Add

Data

Add

Data

Add

Data

Read/Reset

1X

F0

3AAA

AA

555

55

X

F0

Auto Select

3

AAA

AA

555

55

AAA

90