M29W640DT Datasheet, PDF (15/49 Pages) STMicroelectronics – 64 Mbit 8Mb x8 or 4Mb x16, Boot Block 3V Supply Flash Memory

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..
Table 4. Commands, 16-bit mode, BYTE = V_IH
Bus Write Operations
Command
1st
2nd
3rd
4th
5th
6th
Addr Data Addr Data Addr Data Addr Data Addr Data Addr Data
Read/Reset
1 X F0
3 555 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
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
Care. DQ15A–1 is A–1 when BYTE is V_IL or DQ15 when BYTE is V_IH.
Table 5. Commands, 8-bit mode, BYTE = V_IL
Command
Read/Reset
Auto Select
1st
2nd
Add Data Add Data
1 X F0
3 AAA AA 555 55
3 AAA AA 555 55
Bus Write Operations
3rd
4th
5th
6th
Add Data Add Data Add Data Add Data
X
F0
AAA 90
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