MBM29DL324TD Fujitsu Media Devices, MBM29DL324TD Datasheet - Page 66

• Manufacturer Part Number: MBM29DL324TD
• Description: (MBM29DL32xBD) 32M (4M X 8/2M X 16) BIT Dual Operation
• Manufacturer: Fujitsu Media Devices

MBM29DL32XTD/BD
-80/90/12
• Hidden ROM (Hi-ROM) Protect Command
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
, A
, A
) = (0,1,0), and write the sector
6
1
0
group protect command(60H) during the Hidden ROM mode. The same command sequence could be used
because except that it is in the Hidden ROM mode and that it does not apply high voltage to RESET pin, it is
the same as the extension sector group protect in the past. Please refer to “Function Explanation Extended
Command (3) Extentended Sector Group Protection” for details of extention sector group protect setting.
The other is to apply high voltage (V
) to A
and OE, set the sector address in the Hidden ROM area and (A
,
ID
6
9
A
, A
) = (0,1,0), and apply the write pulse during the Hidden ROM mode. To verify the protect circuit, apply high
1
0
voltage (V
) to A
, specify (A
, A
, A
) = (0,1,0) and the sector address in the Hidden ROM area, and read.
ID
6
1
0
9
When “1” appears to DQ
, the protect setting is completed. “0” will appear to DQ
if it is not protected. Please
0
0
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 refer to “Function Explanation
Secor Group Protection” for details of sector group protect setting
Other sector group will be effected if the address other than the Hidden ROM area is selected for the sectoer
group address, so please be carefull. Once it is protected, protection can not be cancelled, so please pay closest
attention.
• Write Operation Status
Detailed in Table 13 are all the status flags that can determine the status of the bank for the current mode
operation. The read operation from the bank where is not operate Embedded Algorithm returns a data of memory
cell. These bits offer a method for determining whether a Embedded Algorithm is completed properly. The
information on DQ
is address sensitive. This means that if an address from an erasing sector is consectively
2
read, then the DQ
bit will toggle. However, DQ
will not toggle if an address from a non-erasing sector is
2
2
consectively read. This allows the user to determine which sectors are erasing and which are not.
The status flag is not output from bank (non-busy bank) not executing Embedded Algorithm. For example, there
is bank (busy bank) which is now executing Embedded Algorithm. When the read sequence is [1] <busy bank>,
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[2] <non-busy bank>, [3] <busy bank>, the DQ
is toggling in the case of [1] and [3]. In case of [2], the data of
6
memory cell is outputted. In the erase-suspend read mode with the same read sequence, DQ
will not be toggled
6
in the [1] and [3].
In the erase suspend read mode, DQ
is toggled in the [1] and [3]. In case of [2], the data of memory cell is
2
outputted.
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