AS29LV400B-90TI 查看數據表（PDF） - Alliance Semiconductor
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AS29LV400B-90TI Datasheet PDF : 25 Pages
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March 2001
AS29LV400
®
Sector erase timer
(DQ3)
Toggle bit 2 (DQ2)
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.
During sector erase, DQ2 toggles with OE or C E 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.
Write operation status
Status
DQ7 DQ6
DQ5 DQ3 DQ2
Standard mode
Auto programming
DQ 7 Toggle
0
Program/erase in auto erase 0
Toggle
0
N/A No toggle
1
Toggle†
Read erasing sector
1
No toggle 0
N/A Toggle
Erase suspend mode
Read non-erasing sector
Program in erase suspend
Data Data
DQ 7 Toggle
Data Data Data
0
N/A Toggle†
Auto programming (byte)
DQ 7 Toggle
1
Exceeded time limits Program/erase in auto erase 0
Toggle
1
Program in erase suspend
(non-erase suspended sector)
DQ7
Toggle
1
N/A No toggle
N/A Toggle†
N/A No toggle
DQ2 toggles when an erase-suspended sector is read repeatedly.
DQ6 toggles when any address is read repeatedly.
DQ2 = 1 if byte address being programmed is read during erase-suspend program mode.
†DQ2 toggles when the read address applied points to a sector which is undergoing erase, suspended erase, or a failure to erase.
RY/B Y
0
0
1
1
0
1
1
1
3/20/01; V.0.9.3
Alliance Semiconductor
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