A d v a n c e I n f o r m a t i o n
START
Read DQ7–DQ0
(Note 1)
Read DQ7–DQ0
No
Toggle Bit
= Toggle?
Yes
No
DQ5 = 1?
Yes
(Notes
1, 2)
Read DQ7–DQ0
Twice
Toggle Bit
= Toggle?
No
Yes
Program/Erase
Operation Not
Complete, Write
Reset Command
Program/Erase
Operation Complete
Notes:
1. Read toggle bit twice to determine whether or not it
is toggling. See text.
2. Recheck toggle bit because it may stop toggling as
DQ5 changes to 1. See text.
Figure 6. Toggle Bit Algorithm
sector erase commands is always less than 50 µs. See also the Sector Erase
Command Sequence‚ on page 22.
After the sector erase command sequence is written, the system should read the
status on DQ7 (Data# Polling) or DQ6 (Toggle Bit I) to ensure the device has ac-
cepted the command sequence, and then read DQ3. If DQ3 is 1, the internally
controlled erase cycle has begun; all further commands (other than Erase Sus-
pend) are ignored until the erase operation is complete. If DQ3 is 0, the device
30
S29AL004D
S29AL004D_00_A1 February 18, 2005
SPANSION [ SPANSION ]
