MX29LV320E 查看數據表（PDF） - Macronix International
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MX29LV320E Datasheet PDF : 68 Pages
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MX29LV320E T/B
COMMAND OPERATIONS (cont'd)
CHIP ERASE
The Chip Erase operation is used erase all the data within the memory array. All memory cells containing a "0"
will be returned to the erased state of "1". This operation requires 6 write cycles to initiate the action. 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 initiates the chip erase operation.
During the chip erase operation, no other software commands will be accepted, but if a hardware reset is re-
ceived or the working voltage is too low, that chip erase will be terminated. After Chip Erase, the chip will auto-
matically return to Read mode.
The system can determine the status of the embedded chip erase operation by the following methods:
Status
In progress
Finished
Exceed time limit
Q7
Q6
Q5
0
Toggling
0
1
Stop toggling
0
0
Toggling
1
Q2
Toggling
1
Toggling
RY/BY#*1
0
1
0
*1: RY/BY# is an open drain output pin and should be connected to VCC through a high value pull-up resistor.
SECTOR ERASE SUSPEND
After beginning a sector erase operation, Erase Suspend is the only valid command that may be issued. If sys-
tem issues an Erase Suspend command during the 50us time-out period following a Sector Erase command, the
time-out period will terminate immediately and the device will enter Erase-Suspended Read mode. If the system
issues an Erase Suspend command after the sector erase operation has already begun, the device will not enter
Erase-Suspended Read mode until Tready1 time has elapsed. The system can determine if the device has en-
tered the Erase-Suspended Read mode through Q6, Q7, and RY/BY#.
After the device has entered Erase-Suspended Read mode, the system can read or program any sector(s) ex-
cept those being erased by the suspended erase operation. Reading any sector being erased or programmed
will return the contents of the status register. Whenever a suspend command is issued, user must issue a re-
sume command and check Q6 toggle bit status, before issue another erase command. The system can use the
status register bits shown in the following table to determine the current state of the device:
Status
Erase suspend read in erase suspended sector
Erase suspend read in non-erase suspended sector
Erase suspend program in non-erase suspended sector
Q7
1
Data
Q7#
Q6
No
toggle
Data
Toggle
Q5
0
Data
0
Q3
N/A
Data
N/A
Q2 RY/BY#
Toggle 1
Data
1
N/A
0
When the device has suspended erasing, user can execute the command sets except sector erase and chip
erase, such as read silicon ID, sector protect verify, program, CFI query and erase resume.
P/N:PM1575
REV. 1.3, DEC. 19, 2013
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