Deleting The Data (Chip Deletion) - Fujitsu MB90460 Series Hardware Manual

CHAPTER 23 512K / 1024K BIT FLASH MEMORY
23.6.3

Deleting the Data (Chip Deletion)

This section explains the procedure of issuing the chip deletion command and deleting
all the data in the flash memory.
■ Deleting the data (Chip deletion)
All the data can be deleted from the flash memory by continuously sending the chip deletion command,
listed in the command sequence table (see "23.4 Method of Starting the Automatic Algorithm in Flash
Memory"), to the target sector in the flash memory.
The chip deletion command is executed by executing the bus operation six times. When the 6th-cycle write
operation has been completed, the chip deletion operation is started. The user need not write the data to the
flash memory before chip deletion operation. During the automatic deletion algorithm execution, the flash
memory writes data "0" to all the cells and verifies them before they are automatically deleted.
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