Patent ID: 11893142
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 12:
13. The digital fingerprint generation circuit according to claim 11, wherein the frequency detector comprises a D flip-flop; the frequency detector is configured to: output a first parameter value in response to a difference between a period of the second clock signal and a period of the first clock signal being greater than or equal to a difference threshold; output a second parameter value in response to the difference between the period of the second clock signal and the period of the first clock signal being less than the difference threshold; wherein after a plurality of periods, the digital fingerprint of the integrated circuit is formed by at least one first parameter value and at least one second parameter value output by the frequency detector; the difference threshold is 0; the first parameter value is 1 and the second parameter value is 0;
an output of the frequency detector comprises a response to a challenge of the digital fingerprint generation circuit;
the challenge of the digital fingerprint generation circuit is a set comprising the first control word, the second control word, a first initial address of the first clock signal, and a second initial address of the second clock signal;
the response from the digital fingerprint generation circuit to the challenge is the digital fingerprint, and the response is a physical unclonable function with respect to the first control word, the second control word, the first initial address of the first clock signal, and the second initial address of the second clock signal;
the first clock generator and the second clock are a clock generator based on a time-average-frequency direct period synthesis;
the first clock generator is configured to periodically accumulate the first control words to generate first clock signals having different periods;
the second clock generator is configured to periodically accumulate the second control words to generate second clock signals having different periods; and
the fraction portion is 0.5.