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M29DW641F Datasheet(PDF) 72 Page - Numonyx B.V

Part # M29DW641F
Description  64 Mbit (4Mb x16, Multiple Bank, Page, Boot Block) 3V Supply Flash Memory
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Manufacturer  NUMONYX [Numonyx B.V]
Direct Link  http://www.numonyx.com
Logo NUMONYX - Numonyx B.V

M29DW641F Datasheet(HTML) 72 Page - Numonyx B.V

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Extended Memory Block
M29DW641F
72/80
C.2
Customer Lockable section of the Extended Block
The device is delivered with the second section of the Extended Block "Customer Lockable":
bits DQ7 and DQ6 are set to '1' and '0' respectively. It is up to the customer to program and
protect this section of the Extended Block but care must be taken because the protection is
not reversible.
There are three ways of protecting this section:
Issue the Enter Extended Block command to place the device in Extended Block mode,
then use the In-System Technique with RP either at VIH or at VID. Refer to Section D.2:
In-system technique in Appendix D: High voltage Block Protection, and to the
corresponding flowcharts
Figure 24 and Figure 25 for a detailed explanation of the
technique).
Issue the Enter Extended Block command to place the device in Extended Block mode,
then use the Programmer Technique. Refer to
Section D.1: Programmer technique in
Appendix D: High voltage Block Protection, and to the corresponding flowcharts
Figure 22 and Figure 23 for a detailed explanation of the technique).
Issue a Set Extended Block Protection bit command to program the Extended Block
Protection bit to ‘1’ thus preventing the second section of the Extended Block from
being programmed.
Bit DQ6 of the Extended Block Protection indicator is automatically set to '1' to indicate that
the second section of the Extended Block is Customer Locked.
Once the Extended Block is programmed and protected, the Exit Extended Block command
must be issued to exit the Extended Block mode and return the device to Read mode.
Table 35.
Extended Block Address and Data
Device
Address(1)
1.
See
Table 28: Block Addresses.
Data
Factory Locked
Customer
Lockable
M29DW641F
000000h-00003Fh
Random Number,
Security Identification Number, ESN(2)
2.
ENS = Electronic Serial Number.
Unavailable
000040h-00007Fh
Unavailable
Determined by
Customer


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