Systems and methods for code protection in non-volatile memory systems
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United States of America Patent
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Jul 12, 2016
Grant Date -
Mar 20, 2014
app pub date -
Sep 14, 2012
filing date -
Sep 14, 2012
priority date (Note) -
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Abstract
Methods and systems are disclosed for code protection in non-volatile memory (NVM) systems. Information stored within NVM memory sectors, such as boot code or other code blocks, is protected using lockout codes and lockout keys written in program-once memory areas within the NVM systems. Further, lockout codes can be combined into a merged lockout code that can be stored in a merged protection register. The merged protection register is used to control write access to protected memory sectors. Lockout code/key pairs are written to the program-once area when a memory sector is protected. The program-once area, which stores the lockout code/key pairs, is not readable by external users. Once protected, a memory sector can not be updated without the lockout code/key pair.
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