Importance

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Abstract

An integrated circuit includes a demodulator for receiving an encrypted message and a hardware unit coupled to the demodulator and configured to enable the demodulator to decrypt the received message. The hardware unit includes a processing unit, a read-only access memory (ROM) having a boot code causing the integrated circuit to fetch data from an external memory, a random access memory (RAM) for storing the fetched data, multiple non-volatile memory registers or fuses, and an interface unit configured to write the data stored in the RAM to an external storage in response to a backup event. The data may be encrypted using an encryption key prior to being written to the external storage. The interface unit may include a direct memory access controller. The external memory and the external storage can be a same non-volatile memory, namely a Flash device.

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First Claim