MBM29LV320TE Fujitsu Microelectronics, Inc., MBM29LV320TE Datasheet - Page 30

• Manufacturer Part Number: MBM29LV320TE
• Description: 32 M 4 M X 8/2 M X 16 Bit
• Manufacturer: Fujitsu Microelectronics, Inc.

30
MBM29LV320TE/BE
11. Hidden ROM (Hi-ROM) Protect Command
12. Write Operation Status
*: Successive reads from the erasing or erase-suspend sector will cause DQ
In Progress
Exceeded
Time Limits
There are two methods to protect the Hidden ROM area. One is to write the sector group protect setup command
(60h) , set the sector address in the Hidden ROM area and (A
protect command (60h) during the Hidden ROM mode. The same command sequence could be used because
it is the same as the extension sector group protect in the past except that it is in the Hidden ROM mode and it
does not apply high voltage to RESET pin. Please see “9. Extended Sector Group Protection” in FUNCTIONAL
DESCRIPTION for details of extention sector group protect setting.
The other is to apply high voltage (V
A
high voltage (V
read. When “1” appears on DQ
Please apply write pulse agian. The same command sequence could be used for the above method because
other than the Hidden ROM mode, it is the same as the sector group protect in the past. Please see “7. Sector
Group Protection” in FUNCTIONAL DESCRIPTION for details of the sector group protect setting.
Other sector group will be effected if the address other than those for Hidden ROM area is selected for the sector
group address, so please be carefull. Once it is protected, protection can not be cancelled, so please pay the
closest attention.
Details in “Hardware Sequence Flags Table” are all the status flags that can be used to check the status of the
device for current mode operation. During sector erase, the part provides the status flags automatically to the
I/O ports. The information on DQ
consecutively read, then the DQ
sector is consecutively read. This allows users to determine which sectors are in erase.
Once erase suspend is entered, address sensitivity still applies. If the address of a non-erasing sector (that is,
one available for read) is provided, then stored data can be read from the device. If the address of an erasing
sector (that is, one unavailable for read) is applied, the device will output its status bits.
suspend sector address will indicate logic “1” at the DQ
1
, A
0
)
(0,1,0) , and apply the write pulse during the Hidden ROM mode. To verify the protect circuit, apply
Embedded Program Algorithm
Embedded Erase Algorithm
Erase
Suspended
Mode
Embedded Program Algorithm
Embedded Erase Algorithm
Erase
Suspended
Mode
ID
) to A
9
, specify (A
Erase Suspend Read
Erase Suspend Read
Erase Suspend Program
Erase Suspend Program
(Erase Suspended Sector)
(Non-Erase Suspended Sector)
(Non-Erase Suspended Sector)
(Non-Erase Suspended Sector)
Status
0
, the protect setting is completed. “0” will appear on DQ
2
2
bit will toggle. However, DQ
is address sensitive. This means that if an address from an erasing sector is
6
, A
Hardware Sequence Flags Table
ID
) to A
1
, A
80/90/10
0
)
9
and OE, set the sector address in the Hidden ROM area and (A
(0,1,0) and the sector address in the Hidden ROM area, and
2
bit.
2
6
will not toggle if an address from a non-erasing
, A
1
Data
DQ
DQ
DQ
DQ
DQ
, A
0
1
0
0
7
7
7
7
7
)
Toggle
Toggle
Toggle
Toggle
Toggle
Toggle
2
Data
(0,1,0) , and write the sector group
DQ
to toggle. Reading from non-erase
1
6
Data
DQ
0
0
0
0
1
1
1
5
0
if it is not protected.
Data
DQ
0
1
0
0
0
1
0
3
Toggle *
Toggle
Data
DQ
N/A
N/A
1 *
1
1
2
6
,