Circuit for generating an identification code for an IC
First Claim
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1. An integrated circuit (IC) comprising:
- an ID generating circuit for generating a binary identification code (ID) having a plurality of bits, wherein a state of each bit of the plurality of bits is determined by random process variation in material forming the IC;
a non-volatile memory; and
a control circuit for responding to a write cue event by writing the ID generated by the ID generating circuit into the non-volatile memory.
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Abstract
A ID circuit produces a unique binary identification code (ID) for each integrated circuit in which it is implemented by setting states of each bit of the ID as a function of random variations in material forming the IC that occur at the time the IC is fabricated. The ID circuit includes an ID generating circuit for generating the ID, a non-volatile memory, and a control circuit for writing the ID generated by the ID generating circuit into the non-volatile memory in response to a first occurrence of a write cue event. Thereafter the control circuit responds to each occurrence of a read cue event by reading the ID out of the non-volatile memory and providing it as an IC output.
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Citations
20 Claims
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1. An integrated circuit (IC) comprising:
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an ID generating circuit for generating a binary identification code (ID) having a plurality of bits, wherein a state of each bit of the plurality of bits is determined by random process variation in material forming the IC; a non-volatile memory; and a control circuit for responding to a write cue event by writing the ID generated by the ID generating circuit into the non-volatile memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification