M29W320E ST Microelectronics, M29W320E Datasheet - Page 17

• Manufacturer Part Number: M29W320E
• Description: 32 Mbit (4Mb x8 or 2Mb x16 / Boot Block) 3V Supply Flash Memory
• Manufacturer: ST Microelectronics

the device enters Extended Block mode where all
Bus Read or Program operations to the Boot Block
addresses access the Extended Block. The Ex-
tended Block (with the same address as the boot
block) cannot be erased, and can be treated as
one-time programmable (OTP) memory. In Ex-
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.
Table 4. Commands, 16-bit mode, BYTE = V
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.
Read/Reset
Auto Select
Program
Double Word Program
Unlock Bypass
Unlock Bypass
Program
Unlock Bypass Reset
Chip Erase
Block Erase
Erase Suspend
Erase Resume
Read CFI Query
Enter Extended Block
Exit Extended Block
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
Command
6+
1
3
3
4
3
3
2
2
6
1
1
1
3
4
Addr Data
555
555
555
555
555
555
555
555
555
BA
BA
55
X
X
X
1st
IL
AA
AA
AA
AA
AA
AA
AA
AA
F0
A0
B0
50
90
30
98
or DQ15 when BYTE is V
Addr
2AA
2AA
2AA
PA0
2AA
2AA
2AA
2AA
2AA
PA
X
2nd
IH
Data
PD0
PD
55
55
55
55
00
55
55
55
55
Addr
(BA)
PA1
555
555
555
555
555
555
555
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
21., Block Addresses. The whole chip can be un-
protected to allow the data inside the blocks to be
changed.
Block Protect and Chip Unprotect operations are
described in
X
Bus Write Operations
IH
.
3rd
Data Addr Data Addr Data Addr Data
PD1
F0
A0
90
20
80
80
88
90
APPENDIX D.
555
555
PA
APPENDIX
X
4th
M29W320ET, M29W320EB
PD
AA
AA
00
2AA
2AA
A.,
5th
Table 20.
55
55
555
BA
and
6th
Table
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10
30