MBM29BS12DH Fujitsu Media Devices, MBM29BS12DH Datasheet - Page 37

• Manufacturer Part Number: MBM29BS12DH
• Description: (MBM29FS12DH / MBM29BS12DH) BURST MODE FLASH MEMORY CMOS 128M (8M X 16) BIT
• Manufacturer: Fujitsu Media Devices

Extended Command
HiddenROM Entry Command
(1) Fast Mode
(2) Fast Programming
(3) CFI (Common Flash Memory Interface)
sectors that have not been erase-suspended. Successively reading from the erase-suspended sector while the
device is in the erase-suspend-read mode will cause DQ
After entering the erase-suspend-read mode, the user can program the device by writing the appropriate com-
mand sequence for Program. This program mode is known as the erase-suspend-program mode. Again, pro-
gramming in this mode is the same as programming in the regular Program mode except that the data must be
programmed to sectors that are not erase-suspended. Successively reading from the erase-suspended sector
while the device is in the erase-suspend-program mode will cause DQ
Program operation is detected by the Data polling of DQ
regular Program operation. Note that DQ
any address within Bank being programmed (erase-suspend program).
To resume the operation of Sector Erase, the Resume command (30h) should be written. Any further writes of
the Resume command at this point will be ignored. Another Erase Suspend command can be written after the
chip has resumed erasing.
The device has Fast Mode function. This mode dispenses with the initial two unlock cycles required in the
standard program command sequence writing Fast Mode command into the command register. In this mode,
the required bus cycle for programming is two cycles instead of four bus cycles in standard program command.
Do not write any other commands, except Fast Program Command and Reset from Fast Program Command.
The read operation is also executed after exiting this mode. To exit this mode, it is necessary to write Fast Mode
Reset command into the command register. (Refer to “Embedded Programming Algorithm for Fast Mode” in “
FLOW CHART”. ) The V
During Fast Mode, the programming can be executed with two bus cycles operation. The Embedded Program
Algorithm is executed by writing program set-up command (A0h) and data write cycles (PA/PD). (Refer to
“Embedded Programming Algorithm for Fast Mode” in “ FLOW CHART”. )
The CFI (Common Flash Memory Interface) specification outlines device and host system software interro gation
handshake which allows specific vendor-specified software algorithms to be used for entire families of device.
This allows device-independent, JEDEC ID-independent, and forward-and backward-compatible software sup-
port for the specified flash device families. Refer to CFI specification in detail.
The operation is initiated by writing the query command (98h) into the command register. Following the command
write, a read cycle from specific address retrives device information. Please note that output data of upper byte
(DQ
to write the Read/Reset command sequence into the register.
The device has a HiddenROM area with One Time Protect function. This area is to enter the security code and
to unable the change of the code once set. Program/erase is possible in this area until it is protected. However,
once it is protected, it is impossible to unprotect, so please use this with caution.
The HiddenROM area is 128 words (64 words for factory and 64 words for customer). This area is normally the
“outermost” 4 Kwords boot block area in Bank A. Therefore, write the HiddenROM entry command sequence
to enter the HiddenROM area. It is called HiddenROM mode when the HiddenROM area appears.
The following commands are not allowed when the HiddenROM is enabled.
1. CFI
2. Set to Fast Mode
3. Fast Program
4. Reset from Fast Mode
5. Sector Erase Suspend
6. Sector Erase Resume
7. Chip Erase Command
15
to DQ
8
) is “0” in word mode (16 bit) read. Refer to the CFI code table. To terminate operation, it is necessary
CC
active current is required even CE = V
7
must be read from the Program address while DQ
7
2
or by the Toggle Bit I (DQ
to toggle. (See the section on DQ
MBM29BS/FS12DH
IH
during Fast Mode.
2
to toggle. The end of the erase-suspended
6
) which is the same as the
2
6
. )
can be read from
15
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