W29GL256SH9T-TR Datasheet, PDF (45/88 Pages) Winbond – 256M-BIT 3.0-VOLT PARALLEL FLASH MEMORY WITH PAGE MODE

W29GL256S
8.13.2.5 Toggle Bits DQ6/DQ2
In order to discern Toggle bit status, DQ7-DQ0 must be read at least twice in a row to determine if a
toggle bit is actually toggling. If it is determined that the toggle bit has stopped toggling, this would
indicate that the device has either completed the program or erase operation. This being the case, on
the next read cycle array data on DQ15-DQ0 can be read.
If it is determines that the toggle bit is still toggling, then DQ5 (Exceeded Timing Limits) should be
read to see if the current operation has exceeded its timed limit (DQ5=1). If the value of DQ5 is ‘1’
then another read of the toggle bit should be done in case DQ5 went high at the same time the toggle
bit stop toggling. A successful completion of a program or erase operation is indicated by the toggle
bit has stopped toggling. If the toggle bit is toggling, the operation did not complete successfully and
then must issue the reset command to return to reading array data.
Refer to Toggle Bit Program Figure.
Publication Release Date: Jul 02, 2014
Revision C
45