Patent ID: 11886621
Assignee: SILICON LABORATORIES INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 18:
19. A wireless device comprising:
a crystal oscillator to oscillate at a first frequency; and
an integrated circuit coupled to the crystal oscillator, the integrated circuit comprising:
a non-volatile memory to store a universal key for a stock keeping unit of the integrated circuit;
an oscillator to generate a reference clock signal at the first frequency using the crystal oscillator;
a clock generator to receive the reference clock signal at the first frequency and generate, based at least in part thereon, a second clock signal at a second frequency, the second frequency substantially greater than the first frequency;
a counter coupled to the clock generator, the counter to maintain a first count regarding a number of cycles of the second clock signal during a cycle of the reference clock signal; and
a controller coupled to the counter, wherein the controller is to prevent a compromise of the universal key based at least in part on detection of a security violation in which an attacker modifies the first frequency.