Qualcomm Incorporated

Chandan Agarwalla

Dipti Ranjan Pal

Keith Alan Bowman

Matthew Levi Severson

Christopher Kong Yee Chun

Joshua Stubbs

Shih-Hsin Jason Hu

Bharat Kumar Rangarajan

Srinivas Turaga

Kumar Kanti Ghosh

Nilanjan Banerjee

Ateesh Deepankar De

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.

On-die voltage-frequency security monitor

Dynamic power supply voltage adjustment in a computing device may involve two stages. In a first stage, a first method for adjusting a power supply voltage may be disabled. While the first method remains disabled, a request to adjust the power supply voltage from an initial value to a target value using a second method may be received. The second method may be initiated in response to the request if a time interval has elapsed since a previous request to adjust the power supply voltage. In a second stage, the first method may be enabled when it has been determined that the power supply voltage has reached the target value.

Two-stage dynamic power supply voltage adjustment

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San Diego, CA, United States of America

Chandan Agarwalla