METHOD FOR OPERATING NON-VOLATILE FLASH MEMORY WITH WRITE PROTECTION MECHANISM
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United States of America Patent
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Issued Date -
Oct 6, 2011
app pub date -
Apr 1, 2010
filing date -
Apr 1, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for operating a non-volatile flash memory with a write protection mechanism is provided. The method comprises the steps as follow. A command is issued. When the command is a safeguard information modification command, only when the safeguard information modification command matches the specific combination of the plurality of modification instructions, a safeguard information is allowed to be modified. When the command is a flash memory data modification command, only when both the status register protection information and the safeguard information indicate that the memory block/sector is not under write-protection, the memory block/sector is allowed to be modified according to the flash memory data modification command.
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