MX29LV320ETTI-70G Macronix, MX29LV320ETTI-70G Datasheet - Page 24

• Manufacturer Part Number: MX29LV320ETTI-70G
• Description: MX29LV Series 3 V 32 Mb (4M x 8/2M x 16) 70 ns Parallel Flash - TSOP-48
• Manufacturer: Macronix

SECTOR ERASE
The sector erase operation is used to clear data within a sector by returning all of its memory locations to the
"1" state. It requires six command cycles to initiate the erase operation. The first two cycles are "unlock cycles",
the third 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 has been issued, an internal 50us time-out counter
is started. Until this counter reaches zero, additional sector addresses and Sector Erase commands may be is-
sued thus allowing multiple sectors to be selected and erased simultaneously. After the 50us time-out counter
has expired, no new commands will be accepted and the embedded sector erase operation will begin. Note that
the 50us timer-out counter is restarted after every erase command sequence. If the user enters any command
other than Sector Erase or Erase Suspend during the time-out period, the erase operation will abort and the de-
vice will return to Read mode.
After the embedded sector erase operation begins, all commands except Erase Suspend will be ignored. The
only way to interrupt the operation is with an Erase Suspend command or with a hardware reset. The hardware
reset will completely abort the operation and return the device to Read mode.
The system can determine the status of the embedded sector erase operation by the following methods:
Note :
1. The Q3 status bit is the time-out indicator. When Q3=0, the time-out counter has not yet reached zero and
2. RY/BY# is an open drain output pin and should be connected to VCC through a high value pull-up resistor.
3. When an attempt is made to erase only protected sector(s), the program operation will abort thus preventing
4. Q2 is a localized indicator showing a specified sector is undergoing erase operation or not. Q2 toggles when
P/N:PM1575
COMMAND OPERATIONS (cont'd)
Status
Time-out period
In progress
Finished
Exceeded time limit
a new Sector Erase command may be issued to specify the address of another sector to be erased. When
Q3=1, the time-out counter has expired and the Sector Erase operation has already begun. Erase Suspend
is the only valid command that may be issued once the embedded erase operation is underway.
any data changes in the protected sector(s). Q7 will output zero and Q6 will toggle (briefly 100us or less)
before aborting and returning the device to read mode. If unprotected sectors are also specified, however,
they will be erased normally and the protected sector(s) will remain unchanged.
user reads at addresses where the sectors are actively being erased (in erase mode) or to be erased (in erase
suspend mode). When a sector has been completely erased, Q2 stops toggling at the sector even when the
device is still in erase operation for remaining selected sectors. At that circumstance, Q2 will still toggle when
device is read at any other sector that remains to be erased.
Q7
0
0
1
0
Stop toggling
Toggling
Toggling
Toggling
Q6
24
Q5
0
0
0
1
MX29LV320E T/B
Q3 (note 1)
0
1
1
1
Toggling
Toggling
Toggling
Q2
1
REV. 1.2, MAY 23, 2011
(note 2)
RY/BY#
0
0
1
0