M29DW641F datasheet(71/80 Pages) NUMONYX

Part #	M29DW641F

Description	64 Mbit (4Mb x16, Multiple Bank, Page, Boot Block) 3V Supply Flash Memory

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M29DW641F

Extended Memory Block

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Appendix C

Extended Memory Block

The M29DW641F has an extra block, the Extended Block, that can be accessed using a

dedicated command.

This Extended Block is 128 Words. 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:

●

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.

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

Section 3.6.2: Verify Extended

Block Protection indicator” in Table 5: Block Protection, for details of how to 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

Section 6.1.10:

Program command and Section 6.3.2: Exit Extended Block command, and to Table 10:

Block Protection commands.

C.1

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

Table 35: Extended Block Address and Data) are written

in this section in the factory.

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