MBM29DL161TE-70TN Meet Spansion Inc., MBM29DL161TE-70TN Datasheet - Page 32

• Manufacturer Part Number: MBM29DL161TE-70TN
• Description: Flash Memory Cmos 16m 2m ? 8/1m ? 16 Bit Dual Operation
• Manufacturer: Meet Spansion Inc.

32
MBM29DL16XTE/BE
Hardware Reset
group. See “MBM29DL16XTE/BE Sector Group Protection Verify Autoselect Codes Tables” and “Expanded
Autoselect Code Tables” in ■DEVICE BUS OPERATION for Autoselect codes.
• Temporary Sector Group Unprotection
This feature allows temporary unprotection of previously protected sector groups of the MBM29DL16XTE/BE
devices in order to change data. The Sector Group Unprotection mode is activated by setting the RESET pin to
high voltage (V
the sector group addresses. Once the V
groups will be protected again. Refer to “(16) Temporary Sector Group Unprotection Timing Diagram” in ■TIMING
DIAGRAM and “(6) Temporary Sector Group Protection Algorithm” in ■FLOW CHART.
• RESET
The MBM29DL16XTE/BE 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 “(11) RESET, RY/BY Timing
Diagram” in ■TIMING DIAGRAM for the timing diagram. Refer to Temporary Sector Group Unprotection for
additional functionality.
• Byte/Word Configuration
The BYTE pin selects the byte (8-bit) mode or word (16-bit) mode for the MBM29DL16XTE/BE devices. When
this pin is driven high, the devices operate in the word (16-bit) mode.The data is read and programmed at DQ
to DQ
becomes the lowest address bit and DQ
Mode Configuration”, “(13) Timing Diagram for Byte Mode Configuration” and “(14) BYTE Timing Diagram for
Write Operations” in ■TIMING DIAGRAM.
• Boot Block Sector Protection
The Write Protect function provides a hardware method of protecting certain boot sectors without using V
function is one of two provided by the WP/ACC pin.
If the system asserts V
“outermost” 8K byte boot sectors (MBM29DL16XTE: SA37 and SA38, MBM29DL16XBE: SA0 and SA1)
independently of whether those sectors were protected or unprotected using the method described in “Sector
Group Protection”. 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.
If the system asserts V
sectors were last set to be protected or unprotected. That is, sector group protection or unprotection for these
two sectors depends on whether they were last protected or unprotected using the method described in “Sector
Group Protection”.
0
. When this pin is driven low, the devices operate in byte (8-bit) mode. Under this mode, the DQ
ID
). During this mode, formerly protected sector groups can be programmed or erased by selecting
READY
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
RH
” before it will allow read access. When the RESET pin is low, the devices will
Retired Product DS05-20880-5E_July 13, 2007
IL
ID
) for at least “t
14
is taken away from the RESET pin, all the previously protected sector
70/90
to DQ
8
bits are tri-stated. Refer to “(12) Timing Diagram for Word
RP
” in order to properly reset the internal state machine.
IL
. The RESET pin has a pulse
15
/A
ID
. This
-1
pin
15