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START
START
Read byte (DQ0–DQ7)
Read byte (DQ0–DQ7)
two times with OE toggling
Address = don’t care
Address = VA *
Does
YES
DQ7 =
data?
NO
DONE
DQ6
DONE
toggle?
NO
NO
YES
Is time
elapsed = 1ms?
NO
NO
DQ5 = 1?
DQ5 = 1?
YES
YES
YES
Read byte (DQ0–DQ7)
Read byte (DQ0–DQ7)
two times with OE toggling
Address = don’t care
Address =
VA *
Does
NO
YES
DQ7 =
data†?
DONE
DONE
DQ6*
toggle ?
NO
Issue Reset/ read
command
YES
DONE
Addr = X
Data = F0h
Issue Reset/ read
command
*
VA = Byte address for programming. VA = any of the sector addresses
within the sector being erased during sector erase. VA = valid address
equals any non-protected sector group address during chip erase.
DQ7 rechecked even if DQ5 = 1 because DQ5 and DQ7 may not change
simultaneously.
DONE
Addr = X
Data = F0h
†
*
DQ6 rechecked even if DQ5 = 1 because DQ6 may stop toggling when
DQ5 changes to 1.
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ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
