Fujitsu MB96300 series Hardware Manual page 876

CHAPTER 33 FLASH MEMORY
33.6.5 Toggle Bit-2 Flag (DQ2)
The toggle bit-2 flag (DQ2) is a flag that uses the toggle bit function to indicate that the
sector is in the erase-suspended state.
■ Toggle bit-2 flag (DQ2)
Table 33.6-11 Toggle bit-2 flag state transitions (state change for normal operation) and Table 33.6-12
Toggle bit-2 flag state transitions (state change for abnormal operation) list the state transitions of the
toggle bit flag.
Table 33.6-11 Toggle bit-2 flag state transitions (state change for normal operation)
Operating Write -->
state Completed
1 -->
DQ2
DATA:2
Table 33.6-12 Toggle bit-2 flag state transitions (state change for abnormal operation)
Operating state Write
DQ2 1
*: If the DQ5 outputs "1" (exceed the timing limit), successive reads from a writing or erasing sector cause DQ2
to toggle. DQ2 does not toggle when the successive reads are executed from other sectors.
●
During a sector erase operation
If successive reads are executed during the execution of the chip sector erase algorithm, the flash memory
DQ2 flag toggles regardless of the location indicated by the read addresses. If successive reads are executed
after the chip sector erase algorithm is completed, the flash memory stops the toggle operation of the bit 2
and outputs the read value of the bit 2 (DATA: 2) to the location indicated by the address.
868
Chip/sector Sector erase
erase --> wait
Completed --> Started
Toggle -->
Toggle
Stop
Chip/sector
erase
*
Sector erase Sector erase
--> Erase suspend -->
suspend (sector Restarted (sector
being erased) being erased)
Toggle Toggle
Sector erase
suspended
(sector not being
erased)
DATA:2