AS29F040 Просмотр технического описания (PDF) - Alliance Semiconductor
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AS29F040 Datasheet PDF : 18 Pages
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DATA polling
(DQ7)
Only active during automated on-chip algorithms or sector erase time outs. DQ7 reflects complement
of data last written when read during the automated on-chip algorithm (0 during erase algorithm);
reflects true data when read after completion of an automated on-chip algorithm (1 after completion of
erase agorithm).
Active during automated on-chip algorithms or sector time outs. DQ6 toggles when CE or OE toggles,
or an Erase Resume command is invoked. When the automated on-chip algorithm is complete, DQ6
Toggle bit 1 (DQ6)
stops toggling and valid data can be read. DQ6 is valid after the rising edge of the fourth pulse of WE
during programming; after the rising edge of the sixth WE pulse during chip erase; after the last rising
edge of the sector erase WE pulse for sector erase. For protected sectors, DQ6 toggles for <1 µs during
writes, and <5 µs during erase (if all selected sectors are protected).
Exceeding time
limit (DQ5)
Indicates unsuccessful completion of program/erase operation (DQ5 = 1). DATA polling remains
active; CE powers the device down to 2 mA. If DQ5 = 1 during chip erase, all or some sectors are
defective; during sector erase, the sector is defective (in this case, reset the device and execute
a program or erase command sequence to continue working with functional sectors); during byte
programming, that particular byte is defective. Attempting to program 0 to 1 will set DQ5 = 1.
Checks whether sector erase timer window is open. If DQ3 = 1, erase is in progress; no commands will
Sector erase timer
(DQ3)
be accepted. If DQ3 = 0, the device will accept additional 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 CE only during an attempt to read a sector being erased.
Toggle bit 2 (DQ2)
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.
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Status
DQ7
Auto programming (byte)
DQ7
Program/erase in auto erase
0
In progress
Erase
suspend
mode
Read erasing sector 1
Read non-erasing
sector
Data
Program in erase
suspend
DQ7
Auto programming (byte)
DQ7
Exceeded time limits Program/erase in auto erase
0
Program in erase suspend
DQ7
* Toggles with OE or CE only for erasing or erase suspended sector addresses.
† Toggles with OE or CE only for erasing or erase suspended sector addresses.
DQ6
DQ5
Toggle 0
Toggle 0
No toggle 0
Data
Data
Toggle 0
Toggle 1
Toggle 1
Toggle 1
DQ3
0
1
0
Data
0
0
1
0
DQ2
No toggle
Toggle*
Toggle
Data
Toggle*
No toggle
Toggle†
No toggle†
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