Data Polling Flag (Dq7) - Fujitsu F2MC-16LX Hardware Manual

CHAPTER 26 2M BIT FLASH MEMORY

26.5.1 Data Polling Flag (DQ7)

The data polling flag (DQ7) is a flag that is used to indicate via the data polling
function whether execution of the automatic algorithm is in progress or has ended.
I State transitions of the data polling flag (DQ7)
❍ State changes during normal operation
Write
Operation
operation -->
state
completed
DQ7 -->
DQ7
DATA: 7
❍ State changes in operation error mode
Operation Write
state operation
DQ7 DQ7
I Write operation
During read accesses while the automatic write algorithm is executed, bit 7 of the last data item
written to flash memory is referenced and output, regardless of the specified address. If the read
operation is performed at the time when the automatic write algorithm has ended, the read value
of bit 7 for the specified address in flash memory is output.
I Chip/sector erase operation
When the chip erase/sector erase algorithm is being executed, "0" is returned in read operations
of the flash memory, either for the sector currently erased in sector erase mode, or
independently of addressing in chip erase mode. "1" is output when the chip erase/sector erase
algorithm has ended.
478
Chip sector Sector
erase --> erase wait
completed --> start
0 --> 1 0
Chip sector
erase
operation
0 --> 1
Sector erase
Sector erase -->
suspend -->
erase suspend
resume
(sector being
(sector being
erased)
erased)
0 --> 1 1 --> 0
Sector erased
Suspend mode
Sector not being
erased
DATA: 7