A system and method for preventing unauthorized access to the software of a semiconductor device is provided. The semiconductor device of the present invention includes a memory buffer in the data path between the processor core of the device and the memory of the device. A password for providing full communication in the data path is stored in a defined location in the memory. Upon reading the memory location, the password is provided to a code security module. The password provided to the code security module is compared to a data string provided by the user. If the password and the data string match, the password data path is open for communication between the memory and the processor core. If the password and data string do not match, the password data path is closed to communication between the memory and the processor core.

 
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