Toggle Bit Flag (Dq6) - Fujitsu F2MC-16LX Hardware Manual

25.5.2

Toggle Bit Flag (DQ6)

Like the data polling flag (DQ7), the toggle bit flag (DQ6) is a flag that indicates that the
automatic algorithm execution is proceeding or ended by the toggle bit function.
Transition State of Toggle Bit Flag (DQ6)
State change in normal operation
Operation Programming
→
State
Completion
Toggle
DQ6
→
DATA:6
State change in Abnormal operation
Operation State
DQ6
When Writing/chip Sector is Deleted
If you execute read-access sequentially while executing the automatic write algorithm and the chip/sector
erase algorithm, the flash memory outputs the toggle state generating "1" and "0" alternately per read,
regardless of the specified address. If you execute read-access sequentially after the automatic write
algorithm and the chip/sector erase algorithm ends, the flash memory terminates the bit 6 toggle operation
and outputs the bit 6 (DATA:6) of the read value of the specified address.
Sector Erasing being Suspended
If you execute read-access when the sector erase suspends, the flash memory outputs "1" if the specified
address belongs to the sector being erased. If the specified address does not belong to the sector being
erased, it outputs the bit 6 (DATA: 6) of the read value of the specified address.
Reference:
During writing, when the sector being written is rewrite-protected, the toggle operation is terminated
without rewriting the data after toggle-operating for about 2µs.
During erasing, if all the selected sectors are rewrite-protected, the toggle bit performs toggle-
operation for about 100 µs, and then it goes back to the read/reset state without rewriting the data.
Chip and sector Sector erasing
erasing
wait
→
Completion
→
Toggle Stop
Programming operation
Toggle
CHAPTER 25 3M-BIT FLASH MEMORY
Sector Erasing
→ →
start Temporary
deletion stop
Sector being
erased
→
Toggle Toggle 1
Chip sector deletion operation
Toggle
Sector Erasing Sector Erasing
being Suspended Temporary
→
Sector not being
Restart
deleted
Sector being
erased
→
1 Toggle DATA:6
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