Sector Erasing Timer Flag (Dq3) - Fujitsu F2MC-16LX Hardware Manual

25.5.4

Sector Erasing Timer Flag (DQ3)

The sector erase timer flag (DQ3) is a flag that indicates whether the status is in the
sector erase wait period or not after starting the sector erase command.
Transition State of Sector Erasing Timer Flag (DQ3)
State change in normal operation
Operation Programming
→
State
Completion
→
DQ3
0 DATA:3
State change in abnormal operation
Operation State
DQ3
When Sector Deletion Operates
If you execute read-access after starting the sector erase command, the flash memory outputs "0" if this
access is in the sector erase wait period and "1" if this access is over the sector erase wait period, regardless
of the specified address of the sector.
When the erase algorithm is in execution with the data polling and toggle bit functions, the internal erasing
is beginning if this flag is "1". Any subsequent commands are ignored except for the write command or
erase suspend command for the sector erase code until erasing finishes.
When this flag is "0", the flash memory accepts writing of an additional sector erase code. To verify that, it
is recommended to check this flag state before writing of subsequent erase codes. If it is "1" at the second
state checking, the additional sector erase code may not be accepted.
Sector Erasing being Suspended
If you execute read-access when the sector erase suspends, the flash memory outputs "1" if the specified
address is the erased sector, and it outputs bit 3 (DATA: 3) of the read value of the specified address if it is
not the erased sector.
Chip and Sector erasing
sector erasing wait
→ →
Completion
1
Programming operation
0
CHAPTER 25 3M-BIT FLASH MEMORY
Sector Erasing
→
Temporary
start deletion stop
Sector being
erased
→ →
0 1 1 0
Chip sector deletion operation
1
Sector Erasing Sector Erasing
being Suspended Temporary
→
Sector not being
Restart
deleted
Sector being
erased
→
DATA:3
0 1
575