M29DW324DB70N6 STMicroelectronics, M29DW324DB70N6 Datasheet - Page 42

• Manufacturer Part Number: M29DW324DB70N6
• Description: Flash 32M (4Mx8 or 2Mx16)
• Manufacturer: STMicroelectronics

Specifications of M29DW324DB70N6

• Data Bus Width: 8 bit, 16 bit
• Memory Type: NOR Flash
• Memory Size: 32 Mbit
• Architecture: Sectored
• Interface Type: CFI
• Access Time: 70 ns
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Maximum Operating Current: 10 mA
• Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TSOP-48
• Organization: 4 MB x 8
• Lead Free Status / Rohs Status: No

M29DW324DT, M29DW324DB
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
tions, BYTE = V
V
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
BYTE = V
Table 29. Extended Block Address and Data
Note: 1. See Tables 21 and 22, Top and Bottom Boot Block Addresses.
42/49
M29DW324DT
M29DW324DB
IH
, respectively, for details of how to read bit
Device
IL
”, respectively.
IL
IH
” in
3F0010h-3FFFFFh
3F0000h-3F000Fh
000010h-00FFFFh
000000h-00000Fh
” and “Commands, 8-bit mode,
and Bus Operations, BYTE =
Tables 3 and 4, Bus Opera-
x8
Address
1F8008h-1FFFFFh
000008h-007FFFh
1F8000h-1F8007h
000000h-000007h
(1)
x16
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:
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.
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).
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).
Security Identification
Security Identification
Factory Locked
Unavailable
Unavailable
Number
Number
Data
Customer Lockable
Determined by
Determined by
Customer
Customer