MBM29PDS322TE Fujitsu Microelectronics, Inc., MBM29PDS322TE Datasheet - Page 22

• Manufacturer Part Number: MBM29PDS322TE
• Description: Flash Memory 32m 2m X 16 Bit Page Dual Operation
• Manufacturer: Fujitsu Microelectronics, Inc.

22
MBM29PDS322TE/BE
RESET
Hardware Reset
Boot Block Sector Protection
Accelerated Program Operation
typically protected in 250 s. To verify programming of the protection circuitry, the sector group addresses pins
(A
command (40h). Following the command write, a logical “1” at device output DQ
sector in the read operation. If 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
18 and 26.)
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 Figure 14 for the timing diagram. Refer to 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” 4K word boot sectors independently of whether those sectors are protected or unprotected using
the method described in “Sector Protection/Unprotection”. The two outermost 4K word 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.
(MBM29PDS322TE: SA69 and SA70, MBM29PDS322BE: SA0 and SA1)
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 present sequence could be used
for programming and detection of completion during acceleration mode.
Removing V
ACC pin while programming. See Figure 19.
RH
20
” before it will allow read access. When the RESET pin is low, the device will be in the standby mode for the
, A
19
, A
ACC
18
ACC
, A
to the WP/ACC pin, the device automatically enters the acceleration mode and the time required
IL
) for at least “t
17
from the WP/ACC pin returns the device to normal operation. Do not remove V
, A
16
, A
IL
IH
15
on the WP/ACC pin, the device disables program and erase functions in the two
on the WP/ACC pin, the device reverts to whether the two outermost 4K word boot
, A
RP
14
” in order to properly reset the internal state machine. Any operation in the process
, A
13
and A
12
) and (A
10/11
6
, A
3
, A
IL
. The RESET pin vs. a pulse requirement and has to
2
, A
1
, A
0
) = (0, 0, 0, 1, 0) should be set and write a
0
will produce for protected
IH
. (Refer to the Figures
ACC
READY
from WP/
” after
ID
.