公开(公告)号：US11880454B2

公开(公告)日：2024-01-23

申请号：US16874538

申请日：2020-05-14

Applicant: QUALCOMM Incorporated

Inventor： Bharat Kumar Rangarajan ,  Dipti Ranjan Pal ,  Keith Alan Bowman ,  Srinivas Turaga ,  Ateesh Deepankar De ,  Shih-Hsin Jason Hu ,  Chandan Agarwalla

IPC: G06F21/55 ,  G06F1/26

CPC classification number: G06F21/554 ,  G06F1/26 ,  G06F2221/034

Abstract: A method to prevent a malicious attack on CPU subsystem (CPUSS) hardware is described. The method includes auto-calibrating tunable delay elements of a dynamic variation monitor (DVM) using an auto-calibration value computed in response to each detected change of a clock frequency (Fclk)/supply voltage (Vdd) of the CPUSS hardware. The method also includes comparing the auto-calibration value with a threshold reference calibration value to determine whether the malicious attack is detected. The method further includes forcing a safe clock frequency (Fclk)/safe supply voltage (Vdd) to the CPUSS hardware when the malicious attack is detected.