MBM29SL160TD Fujitsu Microelectronics, Inc., MBM29SL160TD Datasheet - Page 23

• Manufacturer Part Number: MBM29SL160TD
• Description: Flash Memory 16m 2m X 8/1m X 16 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

One Time Protect (OTP) Region
Write Operarion Status
Notes: 1. Performing successive read operetions from any address will cause DQ
In Progress
Exceeded
Time Limits
The OTP feature provides a Flash memory region that the system may access through a new command
sequence. This is primarily intended for customers who wish to use an Electronic Serial Number (ESN) in the
device with the ESN protected against modification. Once the OTP region is protected, any further modification
of that region is impossible. This ensures the security of the ESN once the product is shipped to the field.
The OTP region is 256 bytes in length. The MBM29SL160TD occupies the address of the byte mode 1FFEFFH
to 1FFFFFH (word mode FFF7FH to FFFFFH) and the MBM29SL160BD type occupies the address of the byte
mode 00000H to 00100H (word mode 00000H to 00080H). After the system has written the Enter OTP command
sequence, the system may read the OTP region by using the addresses normally occupied by the boot sectors.
That is, the device sends all commands that would normally be sent to the boot sectors to the OTP region. This
mode of operation continues until the system issues the Exit OTP command sequence, or until power is removed
from the device. On power-up, or following a hardware reset, the device reverts to sending commands to the
boot sectors.
If you request Fujitsu to program the ESN in the device, please contact a Fujitsu representative for more
information.
2. Reading the byte address being programmed while in the erase-suspend program mode will indicate
logic "1" at the DQ
3. DQ
4. DQ
toggle.
Embedded Program Algorithm
Embedded Erase Algorithm
Erase
Suspended
Mode
Embedded Program Algorithm
Embedded Erase Algorithm
Erase
Suspended
Mode
0
4
and DQ
is Fujitsu internal use only
1
are reserve pins for future use.
2
Erase Suspend Read
(Erase Suspended Sector)
Erase Suspend Read
(Non-Erase Suspended Sector)
Erase Suspend Program
(Non-Erase Suspended Sector)
Erase Suspend Program
(Non-Erase Suspended Sector)
bit. However, successive reads from the erase-suspend sector will cause DQ
MBM29SL160TD
Status
Table 8 Hardware Sequence Flags
-10/-12
/MBM29SL160BD
Data
DQ
DQ
DQ
DQ
DQ
0
1
0
7
7
7
7
7
(Note 1)
Toggle
Toggle
Toggle
Toggle
Toggle
Toggle
6
Data
DQ
to toggle.
1
6
Data Data
DQ
0
0
0
0
1
1
1
5
DQ
0
1
0
0
0
1
0
3
(Note 2)
(Note 2)
2
Toggle
Toggle
-10/-12
to
Data
DQ
N/A
N/A
1
1
1
2
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