M29W128FL View Datasheet(PDF) - Numonyx -> Micron
Part Name
Description
MFG CO.
'M29W128FL' PDF : 78 Pages View PDF
Extended Memory Block
M29W128FH, M29W128FL
C.2 Customer Lockable Extended Memory Block
A device where the Extended Memory Block is customer lockable is delivered with the DQ7 bit set to ‘0’
and the Extended Memory Block unprotected. It is up to the customer to program and protect the
Extended Memory Block but care must be taken because the protection of the Extended Memory Block
is not reversible.
There are two ways of protecting the Extended Memory Block:
● 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 Appendix D: High Voltage Block
Protection, and to the corresponding flowcharts, Figure 20 and Figure 21, 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 Appendix D: High Voltage Block Protection, and to the
corresponding flowcharts, Figure 18 and Figure 19, for a detailed explanation of the technique).
Once the Extended Memory Block is programmed and protected, the Exit Extended Block command
must be issued to exit the Extended Memory Block mode and return the device to Read mode.
Table 35. Extended Memory Block Address and Data
Address(1)
Data
x8
x16
000000h-0000FFh
000000h-00007Fh
1. See Table 28: Block Addresses and Protection Groups.
Factory Locked
Customer Lockable
Security Identification Number Determined by Customer
68/78
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