MX29LAA641D MCNIX [Macronix International], MX29LAA641D Datasheet - Page 21

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

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 first two
cycles are "unlock" cycles, the third one is a configuration cycle, the fourth and fifth 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 confirm if the embedded operation is finished or not by
the following methods:
When the embedded erase operation is on going, user can confirm if the embedded operation is finished 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.
P/N:PM1289
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 issue. The
first two cycles are "unlock cycles", the third one is a configuration cycle, the fourth and fifth 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 address 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 erase or erase suspend during 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 command 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.
Status
In progress
Finished
Exceed time limit
Status
Time-out period
In progress
Finished
Exceed time limit
Q7
0
0
1
0
Q7
0
1
0
Stop toggling
Toggling
Toggling
Toggling
Q6
Stop toggling
Toggling
Toggling
Q6
21
Q5
0
0
0
1
MX29LA641D H/L
Q5
0
0
1
Q3
0
1
1
1
Toggling
Toggling
Q2
1
Toggling
Toggling
Toggling
Q2
1
RY/BY#
REV. 1.1, JAN. 06, 2009
0
1
0
RY/BY#*2
0
0
1
0