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Checks whether sector erase timer window is open. If DQ3 = 1, erase is in progress; no commands
will be accepted. If DQ3 = 0, the device will accept sector erase commands. Check DQ3 before and
after each sector erase command to verify that the command was accepted.
Sector erase timer
(DQ3)
During sector erase, DQ2 toggles with OE or CE only during an attempt to read a sector being
erased. During chip erase, DQ2 toggles with OE or CE for all addresses. If DQ5 = 1, DQ2 toggles
only at sector addresses where failure occurred, and will not toggle at other sector addresses. Use
DQ2 in conjunction with DQ6 to determine whether device is in auto erase or erase suspend
mode.
Toggle bit 2 (DQ2)
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2nd bus
3rd bus
4th bus
5th bus
6th bus
1st bus write cycle
write cycle
write cycle
read/ write cycle
write cycle
write cycle
Required
Command sequence bus cycles Address Data Address Data Address Data Address
Data Address Data Address Data
Read
Reset/ Read
1
XXXXh
F0h
Read Data
Address
2AAAh
5555h
×16
×8
5555h
AAAAh
5555h
AAAAh
Read
Address
Read
Data
Reset/ Read
4
AAh
55h
F0h
90h
2251h(T)
2257h (B)
×16
5555h
AAAAh
2AAAh
5555h
5555h
AAAAh
01h
02h
51h (T)
57h (B)
×8
Autoselect
ID Read
4
AAh
55h
00h
MFR code
×16/ ×8
52h
×16
×8
XXX02h
XXX04h
01 = protected
00 = unprotected
×16
×8
5555h
AAAAh
5555h
AAAAh
5555h
AAAAh
XXXXh
XXXXh
2AAAh
5555h
2AAAh
5555h
2AAAh
5555h
5555h
AAAAh
5555h
AAAAh
5555h
AAAAh
Program
Address
Program
Data
Program
4
6
6
AAh
AAh
AAh
55h
55h
55h
A0h
80h
80h
×16
×8
5555h
AAAAh
5555h
AAAAh
2AAAh
5555h
AAAAh
Chip Erase
Sector Erase
AAh
AAh
55h
55h
10h
30h
5555h
2AAAh
5555h
×16
×8
Sector
Address
Sector Erase Suspend
Sector Erase Resume
1
1
B0h
30h
1
2
3
4
5
6
Bus operations defined in "Mode definitions," on page 4.
Reading data from or programming data to non-erasing sectors allowed in Erase Suspend mode.
Address bit A15 = X = Don’t care for all address commands except Program Address and Sector Address.
Address bit A16 = X = Don’t care for all address commands except Program Address and Sector Address.
System should generate address patterns: ×16 mode - 5555h or 2AAAh to address A0–A14; ×8 mode - AAAAh or 5555h to address A-1–A14.
A = 0, A = 1, A = 0 for sector protect verify; sector selected on A16-A12.
0
1
6
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