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P/N:PM1300 REV. 2.6, DEC. 22, 2011
MX29LV400C T/B
MX29LV800C T/B
MX29LV160C T/B
SECTOR ERASE
Sector Erase is to erase all the data in a sector with "1" and "0" as all "1". It requires six command cycles to is-
sue. The rst two cycles are "unlock cycles", the third one is a conguration cycle, the fourth and fth are also
"unlock cycles" and the sixth cycle is the sector erase command. After the sector erase command sequence is
issued, there is a time-out period of 50us counted internally. During the time-out period, additional sector ad-
dress and sector erase command can be written multiply. Once user enters another sector erase command, the
time-out period of 50us is recounted. If user enters any command other than sector eras or erase suspend dur-
ing time-out period, the erase command would be aborted and the device is reset to read array condition. The
number of sectors could be from one sector to all sectors. After time-out period passing by, additional erase com-
mand is not accepted and erase embedded operation begins.
During sector erasing, all commands will not be accepted except hardware reset and erase suspend and user
can check the status as chip erase.
When the embedded erase operation is on going, user can conrm if the embedded operation is nished or not
by the following methods:
CHIP ERASE
Chip Erase is to erase all the data with "1" and "0" as all "1". It needs 6 cycles to write the action in, and the rst
two cycles are "unlock" cycles, the third one is a conguration cycle, the fourth and fth are also "unlock" cycles,
and the sixth cycle is the chip erase operation.
During chip erasing, all the commands will not be accepted except hardware reset or the working voltage is too
low that chip erase will be interrupted. After Chip Erase, the chip will return to the state of Read Array.
When the embedded chip erase operation is on going, user can conrm if the embedded operation is nished or
not by the following methods:
*1: The status Q3 is the time-out period indicator. When Q3=0, the device is in time-out period and is acceptible
to another sector address to be erased. When Q3=1, the device is in erase operation and only erase suspend is
valid.
*2: RY/BY# is open drain output pin and should be weakly connected to VDD through a pull-up resistor.
*3: When an attempt is made to erase a protected sector, Q7 will output its complement data or Q6 continues
to toggle for 100us or less and the device returned to read array status without erasing the data in the protected
sector.
Status Q7 Q6 Q5 Q2 RY/BY#
In progress 0 Toggling 0 Toggling 0
Finished 1 Stop toggling 0 1 1
Exceed time limit 0 Toggling 1 Toggling 0
Status Q7 Q6 Q5 Q3 Q2 RY/BY#*2
Time-out period 0 Toggling 0 0 Toggling 0
In progress 0 Toggling 0 1 Toggling 0
Finished 1 Stop toggling 0 1 1 1
Exceed time limit 0 Toggling 1 1 Toggling 0