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參數(shù)資料
| 型號： | M29DW640D90N6 |
| 廠商： | 意法半導體 |
| 英文描述： | 64 Mbit (8Mb x8 or 4Mb x16, Multiple Bank, Page, Boot Block) 3V Supply Flash Memory |
| 中文描述： | 64兆位（8兆x8或4Mb的x16插槽，多行，頁，引導塊）3V電源快閃記憶體 |
| 文件頁數(shù)： | 48/56頁 |
| 文件大?。?/td> | 942K |
| 代理商： | M29DW640D90N6 |
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M29DW640D
48/56
APPENDIX C. EXTENDED MEMORY BLOCK
The M29DW640D has an extra block, the Extend-
ed 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 identifica-
tion 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 facto-
ry 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 Indica-
tor Bit” in Tables
3
and
4
,
Bus Operations, BYTE =
V
IL
and
Bus Operations, BYTE = V
IH
, respectively,
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
Enter Extended Block Com-
mand
and
Exit Extended Block Command
para-
graphs, and to Tables
5
and
6
, “
Commands, 16-bit
mode, BYTE = V
IH
” and “
Commands, 8-bit mode,
BYTE = V
IL
”, respectively.
Factory Locked Extended Block
In devices where the Extended Block is factory
locked, the Security Identification Number is writ-
ten to the Extended Block address space (see
Ta-
ble 30., Extended Block Address and Data
) in the
factory. The DQ7 bit is set to ‘1’ and the Extended
Block cannot be unprotected.
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 protec-
tion 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 V
IH
or at V
ID
(refer to Appendix
D
, In-
System Technique and to the corresponding
flowcharts, Figures
23
and
24
, 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
, Programmer Technique and to
the corresponding flowcharts, Figures
21
and
22
, for a detailed explanation of the
technique).
Once the Extended Block is programmed and pro-
tected, the Exit Extended Block command must be
issued to exit the Extended Block mode and return
the device to Read mode.
■
■
Table 30. Extended Block Address and Data
Note: 1. See
Table 23., Block Addresses
.
2. ENS = Electronic Serial Number.
Device
Address
(1)
Data
x8
x16
Factory Locked
Customer
Lockable
M29DW640D
000000h-00000Fh
000000h-000007h
Random Number
Security Identification
Number
Determined by
Customer
000010h-000020h
000008h-00000Fh
ESN
(2)
000021h-0000FFh
000010h-00007Fh
Unavailable
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相關代理商/技術參數(shù) |
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|---|---|
| M29DW640D90N6E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Mbit (8Mb x8 or 4Mb x16, Multiple Bank, Page, Boot Block) 3V Supply Flash Memory |
| M29DW640D90N6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Mbit (8Mb x8 or 4Mb x16, Multiple Bank, Page, Boot Block) 3V Supply Flash Memory |
| M29DW640D90N6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Mbit (8Mb x8 or 4Mb x16, Multiple Bank, Page, Boot Block) 3V Supply Flash Memory |
| M29DW640D90ZA1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Mbit (8Mb x8 or 4Mb x16, Multiple Bank, Page, Boot Block) 3V Supply Flash Memory |
| M29DW640D90ZA1E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Mbit (8Mb x8 or 4Mb x16, Multiple Bank, Page, Boot Block) 3V Supply Flash Memory |
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