MBM29DL324TD Fujitsu Media Devices, MBM29DL324TD Datasheet - Page 57

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

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Hardware Reset
• RESET
The MBM29DL32XTD/BD devices may be reset by driving the RESET pin to V
requirement and has to be kept low (V
Any operation in the process of being executed will be terminated and the internal state machine will be reset
to the read mode “t
devices require an additional “t
be in the standby mode for the 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.
• Boot Block Sector Protection
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” 8K byte boot sectors independently of whether those sectors were protected or unprotected using
the method described in “Sector Protection/Unprotection”. The two outermost 8K 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.
(MBM29DL32XTD: SA69 and SA70, MBM29DL32XBD: 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”.
• Accelerated Program Operation
MBM29DL32XTD/BD offers accelerated program operation which enables the programming in high speed.
If the system asserts V
time required 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 fact 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,
used for programming and detection of completion during acceleration mode.
Removing V
ACC pin while programming. See Figure 21.
ACC
from the WP/ACC pin returns the device to normal operation. Do not remove V
READY
the device automatically set to fast mode. Therefore, the pressent sequence could be
ACC
IL
IH
” after the RESET pin is driven low. Furthermore, once the RESET pin goes high, the
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 8K byte boot
to the WP/ACC pin, the device automatically enters the acceleration mode and the
RH
” before it will allow read access. When the RESET pin is low, the devices will
IL
) for at least “t
RP
” in order to properly reset the internal state machine.
MBM29DL32XTD/BD
IL
. The RESET pin has a pulse
ACC
from WP/
-80/90/12
ID
.
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