MX29LV400CBTC-70G Macronix, MX29LV400CBTC-70G Datasheet - Page 20

• Manufacturer Part Number: MX29LV400CBTC-70G
• Description: MX29LV Series 3 V 4 Mb (524k x 8/256k x 16) 70 ns Parallel Flash - TSOP-48
• Manufacturer: Macronix

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 Tready1 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 larg-
er 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 memo-
ry will be reset during system reset and allows system to read boot code from flash memory.
SECTOR PROTECT OPERATION
When a sector is protected, program or erase operation will be disabled on that protected sector. MX29LV400C/
MX29LV800C/MX29LV160C T/B 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 12 for timing diagram and Figure 13 for the
algorithm for this method.
The other method is asserting Vhv on A9 and OE# pins, with A6 and CE# 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
MX29LV400C/MX29LV800C/MX29LV160C T/B 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 are unprotected when shipped from the factory.
The first method is by applying Vhv on RESET# pin. Refer to Figure 12 for timing diagram and Figure 13 for al-
gorithm 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 unpro-
tect 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 opera-
tion once Vhv is removed from RESET# pin and previously protected sectors are again protected.
P/N:PM1300
20
MX29LV400C T/B
MX29LV800C T/B
MX29LV160C T/B
REV. 2.6, DEC. 22, 2011