Patent ID: 7979630
Filing Date: 2011-07-12
Classification: G06F,G11C

Abstract:
1. A data processing device comprising a central processing unit and a nonvolatile memory unit, wherein the central processing unit is capable of issuing an access request with address information to the nonvolatile memory, the nonvolatile memory unit comprises a storage area, which includes plural storage blocks, and control block for reading/storing data from/to corresponding storage block in accordance with the address information in response to the access request from the central processing unit, a first storage block is used for storing access permission information, and each of the other storage blocks is capable of setting an access protection by setting the access permission information, when the control block receives a request for cancelling the access protection of a second storage block in the other storage blocks, the control block controls erasing data in the second storage block and modifies the access permission information in the first storage block.