Patent ID: 8452935
Filing Date: 2013-05-28
Classification: G06F

Abstract:
1. A device for preventing data stored in the device from being copied or stolen by chip De-cap or Dump ROM code, comprising: an address de-multiplexer, receiving an input address signal and first option signals, and outputting a de-multiplexed address signal based upon the first option signals; a plurality of address encoders, coupled to the address de-multiplexer, for encoding the de-multiplexed address signal generating encoded address signals; an address multiplexer, coupled to output terminals of the plurality of address encoders, receiving the encoded address signals and second option signals, and outputting one encoded address signal of the encoded address signals based upon the second option signals; a non-volatile memory, coupled to the address multiplexer, for storing an accessing address and a data corresponding to the accessing address; wherein the accessing address is previously encoded by software, and the data is correctly accessed only when the accessing address equals to the encoded address signal; and a data decoding selector for decoding the data; wherein the first option signals and the second option signals are designated by and only known by a manufacturer of the device, respectively correspond to a specific critical value, and the critical value is a positive integer.