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23.5.1
Data Polling Flag (DQ7)
The data polling flag (DQ7) indicates whether the automatic algorithm is being executed
or has been terminated, using the data polling function. Table 23.5-3 shows the data
polling flag status transition.
■ When the Write Operation is Executed.
When the read/access is executed during automatic write algorithm execution, the flash memory outputs the
reverse data of bit7 in the last-written data, irrespective of the specified address. When the read/access is
executed at the end of the automatic write algorithm, the flash memory outputs the data of bit7 in the
specified read address. When the read/access is executed at the end of the automatic write algorithm, the
flash memory outputs the data of bit7 in the specified read address.
■ When the Chip/Sector Deletion Operation is Executed.
When the read/access is executed during the chip/sector deletion algorithm execution, the flash memory
outputs "0" from the sector being deleted by the sector deletion, or irrespective of the specified address
during the chip deletion. Similarly, the flash memory outputs "1" at the end of chip/sector deletion
algorithm.
■ When the Sector Deletion Temporary Stop is Executed.
When the access/read is executed while executing the sector deletion temporary stop, the flash memory
outputs "1" if the specified address is the sector being deleted. However, the flash memory outputs the data
of bit7 (DATA:7) of the specified read address, if the specified address is not the sector being deleted. By
referencing this together with the toggle bit flag (DQ6), it can be determined whether the current sector is
in the temporary stop state or which sector is being deleted.
Note:
When the automatic algorithm is started, the read/access to the specified address is ignored. As for
the data reading, the end of data polling flag (DQ7) is posted, and then other data bit can be output.
Therefore, the data read operation after the end of the automatic algorithm should be executed next
to the read/access after verifying the end of data polling flag.
CHAPTER 23 512K / 1024K BIT FLASH MEMORY
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