Extended Memory Block
M29DW128F
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 25 and
Figure 26 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 23 and Figure 24 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 41. Extended Block Address and Data
Address(1)
Data
Device
x8
x16
Factory Locked
Random Number, ESN(2)
Customer Lockable
,
000000h-
00007Fh
000000h-
00003Fh
Unavailable
Security Identification Number
M29DW128F
000080h-
0000FFh
000040h-
00007Fh
Determined by
Customer
Unavailable
1. See Table 34: Block Addresses and Protection Groups.
2. ESN = Electronic Serial Number.
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NUMONYX [ NUMONYX B.V ]
