參數(shù)資料
型號(hào)： M29DW640F70N6F
廠商： STMICROELECTRONICS
元件分類： PROM
英文描述： 4M X 16 FLASH 3V PROM, 70 ns, PDSO48
封裝： 12 X 20 MM, LEAD FREE, PLASTIC, TSOP-48
文件頁數(shù)： 62/74頁
文件大?。?/td> 556K
代理商： M29DW640F70N6F
M29DW640F
Extended Memory Block
Appendix C
Extended Memory Block
The 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 either Factory Locked or Customer Lockable, its status is indicated
by bit DQ7. This bit is permanently set to either ‘1’ or ‘0’ at the factory and cannot be
changed. When set to ‘1’, it indicates that the device is factory locked and the Extended
Block is protected. When set to ‘0’, it indicates that the device is customer lockable and the
Extended Block is unprotected. 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.
Bit DQ7 is the most significant bit in the Extended Block Verify Code and a specific
procedure must be followed to read it. See “Extended Block Indicator Bit” in Table 4: Bus
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 Section 4.3: Block
respectively.
C.1
Factory Locked Extended Block
In devices where the Extended Block is factory locked, the Security Identification Number is
written to the Extended Block address space (see Table 31: Extended Block address and
data) in the factory. The DQ7 bit is set to ‘1’ and the Extended Block cannot be unprotected.
C.2
Customer Lockable Extended Block
A device where the Extended Block is customer lockable is delivered with the DQ7 bit set to
‘0’ and the Extended Block unprotected. It is up to the customer to program and protect the
Extended Block but care must be taken because the protection of the Extended Block is not
reversible.
There are two ways of protecting the Extended 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,
Equipment Chip Unprotect flowchart, 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, Figure 20: Programmer
Unprotect flowchart, for a detailed explanation of the technique).
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