MBM29DS163TE Fujitsu Media Devices, MBM29DS163TE Datasheet - Page 23

• Manufacturer Part Number: MBM29DS163TE
• Description: (MBM29DS163BE/TE) FLASH MEMORY CMOS 16 M (2 M X 8/1 M X 16) BIT
• Manufacturer: Fujitsu Media Devices

Temporary Sector Group Unprotection
Extended Sector Group Protection
ERASE ARCHITECTURE”.) The sector group protection feature is enabled using programming equipment at
the user’s site. The device is shipped with all sector groups unprotected.
To activate this mode, the programming equipment must force V
V
and A
Address (MBM29DS163BE)” Table in “
address for each of the seventy one (71) individual sectors, and t“Sector Group Addresses (MBM29DS163TE)”
Table and “Sector Group Addresses (MBM29DS163BE)” Table in “ FLEXIBLE SECTOR-ERASE ARCHITEC-
TURE” define the sector group address for each of the twenty five (25) individual group sectors. Programming
of the protection circuitry begins on the falling edge of the WE pulse and is terminated with the rising edge of
the same. Sector group addresses must be held constant during the WE pulse. See “Sector Group Protection
Timing Diagram” in “
sector group protection waveforms and algorithm.
To verify programming of the protection circuitry, the programming equipment must force V
with CE and OE at V
A
Otherwise the device will produce “0” for unprotected sector. In this mode, the lower order addresses, except
for A
and device codes. A
It is also possible to determine if a sector group is protected in the system by writing an Autoselect command.
Performing a read operation at the address location XX02h, where the higher order addresses (A
A
group. See “MBM29DS163TE/BE Sector Group Protection Verify Autoselect Codes” Table and “Expanded Au-
toselect Code “ Table in “ DEVICE BUS OPERATION” for Autoselect codes.
This feature allows temporary unprotection of previously protected sector groups of the device in order to change
data. The Sector Group Unprotection mode is activated by setting the RESET pin to high voltage (V
this mode, formerly protected sector groups can be programmed or erased by selecting the sector group ad-
dresses. Once the V
protected again. Refer to “Temporary Sector Group Unprotection Timing Diagram” in “
and ”Temporary Sector Group Unprotection Algorithm” in “ FLOW CHART”.
In addition to normal sector group protection, the device has Extended Sector Group Protection as extended
function. This function enables to protect sector group by forcing V
sequence. Unlike conventional procedure, it is not necessary to force V
only RESET pin requires V
requires V
into the command register. Then, the sector group addresses pins (A
(A
addresses pins) , and write extended sector group protection command (60h) . A sector group is typically
protected in 250 s. To verify programming of the protection circuitry, the sector group addresses pins (A
A
the command write, a logical “1” at device output DQ
the output is logical “0”, please repeat to write extended sector group protection command (60h) again. To
terminate the operation, it is necessary to set RESET pin to V
Timing Diagram” in “
CHART”.)
ID
12
15
17
6
) while (A
, A
, A
, A
0
11.5 V) , CE
, A
14
16
1
12
, A
, A
, A
) should be set to the sector to be protected. “Sector Address (MBM29DS163TE)” Table and “Sector
1
, and A
0
13
15
)
ID
, and A
, A
on RESET pin. With this condition, the operation is initiated by writing the set-up command (60h)
6
, A
14
(0, 1, 0) should be set to the sector group to be protected (recommend to set V
, A
6
1
, A
are DON’T CARES. Address locations with A
12
13
) are the desired sector group address will produce a logical “1” at DQ
0
-1
V
IL
and A
)
ID
IL
requires to apply to V
and WE at V
TIMING DIAGRAM” and ”Sector Group Protection Algorithm” in “
is taken away from the RESET pin, all the previously protected sector groups will be
and A
TIMING DIAGRAM” and ”Extended Sector Group Protection Algorithm” in “
(0, 1, 0) will produce a logical “1” code at device output DQ
12
ID
) and (A
6
for sector group protection in this mode. The extended sector group protection
A
0
IH
6
. Scanning the sector group addresses (A
, A
V
IL
1
, A
, A
FLEXIBLE SECTOR-ERASE ARCHITECTURE” define the sector
1
0
IL
)
on byte mode.
V
IH
(0, 1, 0) should be set and write a command (40h) . Following
. The sector group addresses (A
0
will produce for protected sector in the read operation. If
ID
MBM29DS163TE/BE
IH
1
. (Refer to “Extended Sector Group Protection
on address pin A
V
IL
are reserved for Autoselect manufacturer
ID
19
ID
, A
on RESET pin and write a command
and control timing for control pins. The
18
, A
19
17
, A
, A
9
and control pin OE, (suggest
19
18
16
, A
, A
, A
18
0
17
15
, A
for a protected sector.
0
, A
, A
for a protected sector
TIMING DIAGRAM”
ID
17
16
14
FLOW CHART” for
, A
on address pin A
, A
, A
16
15
13
19
IL
, A
, A
, A
and A
for the other
15
14
ID
18
, A
, A
) . During
, A
12
14
13
FLOW
17
19
) and
, and
, A
, A
, A
10
13
16
18
9
,
,
,
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