參數(shù)資料
型號: M29DW324DB90ZA1E
廠商: 意法半導體
英文描述: 32 Mbit 4Mb x8 or 2Mb x16, Dual Bank 16:16, Boot Block 3V Supply Flash Memory
中文描述: 32兆位4Mb的x8或功能的2Mb x16插槽,雙行16點16分,啟動塊3V電源快閃記憶體
文件頁數(shù): 42/49頁
文件大?。?/td> 815K
代理商: M29DW324DB90ZA1E
M29DW324DT, M29DW324DB
42/49
APPENDIX C. EXTENDED MEMORY BLOCK
The M29DW324D has an extra block, the Extend-
ed Block, that can be accessed using a dedicated
command.
This Extended Block is 32 KWords in x16 mode
and 64 KBytes 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 Memory
Block Verify Code
” in
Tables 3 and 4, Bus Opera-
tions, 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 29, 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:
I
Issue the Enter Extended Block command to
place the device in Extended Block mode, then
use the In-System Technique (refer to Appendix
D, In-System Technique and to the
corresponding flowcharts, Figures 22 and 23,
for a detailed explanation of the technique).
I
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 20 and 21,
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 29. Extended Block Address and Data
Note: 1. See Tables 21 and 22, Top and Bottom Boot Block Addresses.
Device
Address
(1)
Data
x8
x16
Factory Locked
Customer Lockable
M29DW324DT
3F0000h-3F000Fh
1F8000h-1F8007h
Security Identification
Number
Determined by
Customer
3F0010h-3FFFFFh
1F8008h-1FFFFFh
Unavailable
M29DW324DB
000000h-00000Fh
000000h-000007h
Security Identification
Number
Determined by
Customer
000010h-00FFFFh
000008h-007FFFh
Unavailable
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