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Semiconductor device identifier generation method and semiconductor device

  • US 9,129,671 B2
  • Filed: 04/04/2007
  • Issued: 09/08/2015
  • Est. Priority Date: 04/13/2006
  • Status: Active Grant
First Claim
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1. A method of generating an identifier from a semiconductor device comprising a volatile memory having a plurality of memory cells, the method comprising:

  • (a) causing the memory cells to assume a first plurality of pseudo-random bit values inherent to variations in the microstructure of the memory cells;

    (b) retrieving, by a processor circuit, the pseudo-random bit values from at least a subset of the plurality of memory cells;

    (c) causing the memory cells to assume at least a second plurality of pseudo-random bit values inherent to variations in the microstructure of the memory cells; and

    (d) generating the identifier by averaging at least some of the first plurality pseudo-random bit values and the at least second plurality of pseudo-random bit values.

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