M29DW128F60NF1E STMICROELECTRONICS [STMicroelectronics], M29DW128F60NF1E Datasheet - Page 83

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M29DW128F60NF1E

Manufacturer Part Number
M29DW128F60NF1E
Description
128 Mbit (16Mb x8 or 8Mb x16, Multiple Bank, Page, Boot Block) 3V supply Flash memory
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
M29DW128F
Appendix C
C.1
The M29DW128F has an extra block, the Extended Block, that can be accessed using a
dedicated command.
This Extended Block is 128 Words in x16 mode and 256 bytes in x8 mode. It is used as a
security block (to provide a permanent security identification number) or to store additional
information.
The Extended Block is divided into two memory areas of 64 Words each:
Bits DQ6 and DQ7 are the most significant bits in the Extended Block Protection Indicator
and a specific procedure must be followed to read it. See
Block Protection
read bit DQ7.
The Extended Block can only be accessed when the device is in Extended Block mode. For
details of how the Extended Block mode is entered and exited, refer to the
Program command
Table 15
Factory Locked Section of the Extended Block
The first section of The Extended Block is permanently protected from program operations
and cannot be unprotected. The Random Number, Electronic Serial Number (ESN) and
Security Identification Number (see
in this section in the factory.
The first one is Factory Locked.
The second one is Customer Lockable. It is up to the customer to protect it from
program operations. Its status is indicated by bit DQ6 and DQ7. When DQ7 is set to ‘1’
and DQ6 to ‘0’, it indicates that this second memory area is Customer Lockable. When
DQ7 and DQ6 are both set to ‘1’, it indicates that the second part of the Extended Block
is Customer Locked and protected from program operations. Bit DQ7 being
permanently locked to either ‘1’ or ‘0’ is another security feature which ensures that a
customer lockable device cannot be used instead of a factory locked one.
and
Extended Memory Block
Table
Indicator” and
16, Block Protection Commands.
and
Section 6.3.2: Exit Extended Block command
Table 5
Table 41: Extended Block Address and
and
Table
8, Block Protection, for details of how to
“Section 3.6.2: Verify Extended
Extended Memory Block
paragraphs, and to
Data) are written
Section 6.1.11:
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