Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2011-03-15
2011-03-15
Choe, Yong (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S159000, C711S163000, C711S170000, C711S203000, C711S118000, C711S118000
Reexamination Certificate
active
07908450
ABSTRACT:
A memory management unit manages a memory that stores a code, and sets that the memory that stores the code to be executed is valid to make a processor execute the code stores a verification key used to verify a validity of the code in a verification-key storing unit. When the code is stored in the memory and ready to be executed by the processor, the memory management unit verifies the validity of the code using the verification key stored in the verification-key storing unit and verification information assigned to the code. The memory management unit controls to set that the memory is valid when the validity is verified by the verifying unit, and not to set that the memory is valid when the validity is not verified by the verifying unit.
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Hasebe Takayuki
Hayashi Takehiko
Kamada Jun
Okada Souichi
Choe Yong
Fujitsu Limited
Staas & Halsey , LLP
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