MBM29LV320TE Fujitsu Microelectronics, Inc., MBM29LV320TE Datasheet - Page 25

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

9.
10. RESET
Hardware Reset
11. Boot Block Sector Protection
12. Accelerated Program Operation
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
and (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.)
The device may be reset by driving the RESET pin to V
be kept low (V
of being executed will be terminated and the internal state machine will be reset to the read mode “t
the RESET pin is driven low. Furthermore, once the RESET pin goes high, the device requires an additional
“t
duration of the pulse and all the data output pins will be tri-stated. If a hardware reset occurs during a program
or erase operation, the data at that particular location will be corrupted. Please note that the RY/BY output signal
should be ignored during the RESET pulse. See “10. RESET, RY/BY Timing Diagram” in TIMING DIAGRAM
for the timing diagram. See “8. Temporary Sector Group Unprotection” for additional functionality.
The Write Protection function provides a hardware method of protecting certain boot sectors without using V
This function is one of two provided by the WP/ACC pin.
If the system asserts V
“outermost” 8 K byte boot sectors independently of whether those sectors are protected or unprotected using
the method described in “Sector Protection/Unprotection”. The two outermost 8 K byte boot sectors are the two
sectors containing the lowest addresses in a bottom-boot-configured device, or the two sectors containing the
highest addresses in a top-boot-congfigured device.
If the system asserts V
sectors were last set to be protected or unprotected. That is, sector protection or unprotection for these two
sectors depends on whether they were last protected or unprotected using the method described in “Sector
protection/unprotection”.
The device offers accelerated program operation which enables the programming in high speed. If the system
asserts V
for program operation will reduce to about 60 . This function is primarily intended to allow high speed program,
so caution is needed as the sector group will temporarily be unprotected.
The system would use a fast program command sequence when programming during acceleration mode. Set
command to fast mode and reset command from fast mode are not necessary. When the device enters the
acceleration mode, the device automatically set to fast mode. Therefore, the pressent sequence could be used
for programming and detection of completion during acceleration mode.
Removing V
ACC pin while programming. See “17. Accelerated Program Timing Diagram” in TIMING DIAGRAM.
(MBM29LV320TE : SA69 and SA70, MBM29LV320BE : SA0 and SA1)
Extended Sector Group Protection
RH
18
, A
” before it will allow read access. When the RESET pin is low, the device will be in the standby mode for the
17
6
, A
, A
ACC
16
1
ID
, A
, A
ACC
on RESET pin. With this condition, the operation is initiated by writing the set-up command (60h)
to the WP/ACC pin, the device automatically enters the acceleration mode and the time required
0
IL
15
)
) for at least “t
, A
from the WP/ACC pin returns the device to normal operation. Do not remove V
14
(0, 1, 0) should be set to the sector group to be protected (recommend to set V
, A
13
TIMING DIAGRAM and “7. Extended Sector Group Protection Algorithm” in
IH
and A
IL
on the WP/ACC pin, the device reverts to whether the two outermost 8 K byte boot
on the WP/ACC pin, the device disables program and erase functions in the two
ID
RP
for sector group protection in this mode. The extended sector group protection
12
” in order to properly reset the internal state machine. Any operation in the process
) and (A
6
, A
1
, A
0
)
(0, 1, 0) should be set and write a command (40h) . Following
0
will produce for protected sector in the read operation. If
MBM29LV320TE/BE
IL
. The RESET pin has a pulse requirement and has to
IH
. (See “16. Extended Sector Group Protection
ID
20
ID
, A
on RESET pin and write a command
and control timing for control pins. The
19
, A
18
, A
17
, A
16
, A
15
, A
14
ACC
IL
, A
for the other
80/90/10
13
READY
from WP/
and A
FLOW
20
” after
, A
12
19
ID
)
,
.
25