MX29LAA641D MCNIX [Macronix International], MX29LAA641D Datasheet - Page 13

• Manufacturer Part Number: MX29LAA641D
• Description: 64M-BIT [4M x 16/8M x 8] CMOS EQUAL SECTOR
• Manufacturer: MCNIX [Macronix International]

MX29LA641D H/L
RESET# OPERATION
Driving RESET# pin low for a period more than Trp will reset the device back to read mode. If the device is in program
or erase operation, the reset operation will take at most a period of Tready for the device to return to read array mode.
Before the device returns to read array mode, the RY/BY# pin remains low (busy status).
When RESET# pin is held at GND±0.3V, the device consumes standby current(Isb).However, device draws larger
current if RESET# pin is held at Vil but not within GND±0.3V.
It is recommended that the system to tie its reset signal to RESET# pin of flash memory, so that the flash memory will
be reset during system reset and allows system to read the boot-up firware from flash memory.
SECTOR PROTECT OPERATION
When a sector is protected, program or erase operation will be disabled on these sectors. MX29LA641D H/L provides
two methods for sector protection.
Once the sector is protected, the sector remains protected until next chip unprotect, or is temporarily unprotected by
asserting RESET# pin at Vhv. Refer to temporary sector unprotect operation for further details.
The first method is by applying Vhv on RESET# pin. Refer to Figure 14 for timing diagram and Figure 15 for the
algorithm for this method.
The other method is asserting Vhv on A9 and OE# pins, with A6 and CEx at Vil. The protection operation begins at the
falling edge of WE# and terminates at the rising edge. Contact Macronix for details.
CHIP UNPROTECT OPERATION
MX29LA641D H/L provides two methods for chip unprotect. The chip unprotect operation unprotects all sectors within
the device. It is recommended to protect all sectors before activating chip unprotect mode. All sectors groups are
unprotected when shipped from the factory.
The first method is by applying Vhv on RESET# pin. Refer to Figure 14 for timing diagram and Figure 15 for algorithm
of the operation.
The other method is asserting Vhv on A9 and OE# pins, with A6 at Vih and CE# at Vil (see Table 2). The unprotect
operation begins at the falling edge of WE# and terminates at the rising edge. Contact Macronix for details.
TEMPORARY SECTOR UNPROTECT OPERATION
System can apply RESET# pin at Vhv to place the device in temporary unprotect mode. In this mode, previously
protected sectors can be programmed or erased just as it is unprotected. The devices returns to normal operation once
Vhv is removed from RESET# pin and previously protected sectors are again protected.
P/N:PM1289
REV. 1.1, JAN. 06, 2009
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