M29DW128F60NF1 STMICROELECTRONICS [STMicroelectronics], M29DW128F60NF1 Datasheet - Page 25

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M29DW128F60NF1

Manufacturer Part Number
M29DW128F60NF1
Description
128 Mbit (16Mb x8 or 8Mb x16, Multiple Bank, Page, Boot Block) 3V Supply, Flash Memory
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
M29DW128F
Table 10.
1. The Lock bit can always be modified by issuing a Clear Lock Bit command or by taking the device through a Power-up or
Figure 6.
Volatile
Lock
Bit
Hardware Reset.
0
0
0
1
1
0
1
1
Once the correct Password has been provided, the Lock-Down bit is cleared and the Non-
Volatile Modify Protection bits can be set or reset using the appropriate commands (the Set
Non-Volatile Modify Protection Bit command or the Clear Non-Volatile Modify Protection Bits
command, respectively).
If the Password provided is not correct, the Lock-Down bit remains locked and the state of the
Non-Volatile Modify Protection bits cannot be modified.
The Password is a 64-bit code located in the memory space. It must be programmed by the
user prior to selecting the Password Protection mode. The Password is programmed by issuing
a Password Program command and checked by issuing a Password Verify command. The
Password should be unique for each part.
Once the device is in Password Protection mode, the Password can no longer be read or
retrieved. Moreover, all commands to the address where the password is stored, are disabled.
Refer to
on the block protection scheme.
Protection
Volatile
Modify
Block Protection Status
Block Protection State Diagram
Non-
Bit
0
0
1
0
1
1
0
1
Table 10: Block Protection Status
Down bit
Lock-
Set Standard Protection
Protection
Standard
0
1
0
0
0
1
1
1
Mode
Protectio
n Status
Block
00h
01h
Unprotected
Protected
Program/
Erase
Block
Block
Protection
Standard
Default:
and
Figure 7: Software Protection Scheme
Non-Volatile Modify Protection bit cannot be
Non-Volatile Modify Protection bit cannot be
Non-Volatile Modify Protection bit can be
Non-Volatile Modify Protection bit can be
Block Protection Status
Set Password Protection
Mode
Protection
Password
modified
modified
modified
modified
(1)
(1)
(1)
(1)
5 Software Protection
for details
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