S29AL032D

Figure 12.2 Toggle Bit Algorithm

START

Read DQ7–DQ0

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.

12.6DQ5: Exceeded Timing Limits

DQ5 indicates whether the program or erase time has exceeded a specified internal pulse count limit. Under these conditions DQ5 produces a 1. This is a failure condition that indicates the program or erase cycle was not successfully completed.

The DQ5 failure condition may appear if the system tries to program a 1 to a location that is previously programmed to 0. Only an erase operation can change a 0 back to a 1. Under this condition, the device halts the operation, and when the operation has exceeded the timing limits, DQ5 produces a 1.