公开(公告)号：US20210165877A1

公开(公告)日：2021-06-03

申请号：US16244502

申请日：2019-01-10

Applicant: Arm Limited

Inventor： Subbayya Chowdary YANAMADALA ,  Mikael Yves Marie RIEN

IPC: G06F21/55 ,  H03K5/24 ,  G06F21/71

Abstract: An electronic system can include a charge storage device controllably connected to a voltage source; a protected circuit block controllably connected to the charge storage device for receiving a voltage supply from the charge storage device, the protected circuit block operating via an operating clock signal; a voltage detector coupled to the voltage supply of the protected circuit block; a comparator coupled to an output of the voltage detector; and a countermeasure processor coupled to receive an alert signal from an output of the comparator. The voltage at the voltage supply is related to the frequency of the operating clock and a frequency manipulation attack is detected by monitoring a difference between the voltage supply and a comparison voltage.

公开(公告)号：US20200225270A1

公开(公告)日：2020-07-16

申请号：US16244364

申请日：2019-01-10

Applicant: Arm Limited

Inventor： Subbayya Chowdary YANAMADALA ,  Mikael Yves Marie RIEN

IPC: G01R29/02 ,  G01R31/28

Abstract: A sensor system can include a sensor having a charge storage device controllably connected to a voltage source under control of a signal under test; and a readout circuit coupled to the charge storage device to determine whether the pulse width of the signal under test has changed greater than a threshold amount according to a voltage at the charge storage device. In some cases, the determination of whether the pulse width of the signal under test has changed can include determining whether the voltage satisfies a condition with respect to a comparison voltage. In some cases, the determination of whether the pulse width of the signal under test has changed can be based on a propagation delay through a delay chain, where the propagation delay is dependent on the voltage.

公开(公告)号：US20190327004A1

公开(公告)日：2019-10-24

申请号：US15958206

申请日：2018-04-20

Applicant: Arm Limited

Inventor： Mikael Yves Marie RIEN ,  Subbayya Chowdary YANAMADALA

IPC: H04B15/02 ,  H04B3/54

Abstract: A system incorporating a power distribution for functional circuit blocks can include a functional circuit block comprising two or more sub-circuits; a power line comprising at least two segments, a first sub-circuit of the two or more sub-circuits being coupled to a first segment of the at least two segments, and a second sub-circuit of the two or more sub-circuits being coupled to a second segment of the at least two segments; and at least one power delivery circuit (PDC) coupled to the power line at a location to create an electromagnetic flux on two adjacent segments of the at least two segments that is in opposite directions. The PDCs can be arranged coupled to the power line with a number and at locations optimized for mitigating electromagnetic emissions on the power line.

公开(公告)号：US20200043870A1

公开(公告)日：2020-02-06

申请号：US16054123

申请日：2018-08-03

Applicant: Arm Limited

Inventor： Mikael Yves Marie RIEN ,  Subbayya Chowdary YANAMADALA

IPC: H01L23/00

Abstract: A system with circuit alteration detection can include a shield in at least one metal layer over an integrated circuit, and a detector coupled to the shield to detect a change in impedance characteristics of one or more shield lines of the shield due to physical alteration of the shield. The shield lines can be arranged in one or more metal layers and cover an area with shape arrangements such as parallel lines and serpentines. The detector can include one or more comparators to detect a difference in impedance of more than a tolerance value. An appropriate countermeasure response can be initiated upon detection of the difference in impedance.

公开(公告)号：US20200043869A1

公开(公告)日：2020-02-06

申请号：US16054099

申请日：2018-08-03

Applicant: Arm Limited

Inventor： Subbayya Chowdary YANAMADALA ,  Mikael Yves Marie RIEN

IPC: H01L23/00 ,  H04L9/32 ,  H03K3/03 ,  G01R31/28

Abstract: A system with tamper detection can include at least one ring oscillator and a detection circuit coupled to the at least one ring oscillator to detect change in frequency greater than a tolerance. Each ring oscillator can include a plurality of inverters where at least one intermediate node coupling an output of one of the plurality of inverters and an input to another of the plurality of inverters is a sensing node of a plurality of sensing nodes for the system. Outputs from two or more ring oscillators can be compared and a signal to initiate a countermeasure response can be generated when the outputs have a difference greater than a tolerance value.