Tracking events of interest
    1.
    发明授权

    公开(公告)号:US11182234B2

    公开(公告)日:2021-11-23

    申请号:US16409314

    申请日:2019-05-10

    Applicant: Arm Limited

    Abstract: A system for tracking events of interest can include at least one volatile counter; a nonvolatile storage coupled to the at least one volatile counter, the nonvolatile storage storing a bit for each top volatile count number of events identified by the at least one volatile counter; a backup power source coupled to the at least one volatile counter; and readout circuitry and control logic coupled to the one or more of the at least one volatile counter and to the nonvolatile storage, the readout circuitry and control logic being configured to control operations of the at least one volatile counter during an error event and determine a total number of events.

    Power distribution for functional circuit blocks

    公开(公告)号:US10601525B2

    公开(公告)日:2020-03-24

    申请号:US15958206

    申请日:2018-04-20

    Applicant: Arm Limited

    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.

    Tracking events of interest to mitigate attacks

    公开(公告)号:US11232196B2

    公开(公告)日:2022-01-25

    申请号:US16409205

    申请日:2019-05-10

    Applicant: Arm Limited

    Abstract: A computing device can include a comparator coupled to an I/O pin of the computing device; a storage unit coupled to the comparator; and a counter coupled to receive an output of the comparator, an output of the counter being coupled to a computation engine to provide a limit-exceeded signal to the computation engine, wherein the counter comprises a volatile counter and a nonvolatile storage, wherein the nonvolatile storage stores a bit for each top volatile count number of events identified by the volatile counter. The computing device can further include a backup power source coupled to the volatile counter; and readout circuitry and control logic coupled to the volatile counter and to the nonvolatile storage, the readout circuitry and control logic being configured to control operations of the volatile counter during an error event and determine a total number of events. The computing device can be a smart card.

    Detection of pulse width tampering of signals

    公开(公告)号:US11022637B2

    公开(公告)日:2021-06-01

    申请号:US16244364

    申请日:2019-01-10

    Applicant: Arm Limited

    Abstract: A sensor system includes 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 includes 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 is based on a propagation delay through a delay chain, where the propagation delay is dependent on the voltage.

    Context-aware power network
    7.
    发明授权

    公开(公告)号:US10955864B2

    公开(公告)日:2021-03-23

    申请号:US15913051

    申请日:2018-03-06

    Applicant: Arm Limited

    Abstract: A configurable charge storage network and control system provide a context-aware power network for a system including a circuit, the power network coupled to the circuit to provide a core voltage to the circuit; and a context-based controller that monitors a supply voltage level of a power supply, monitors a core voltage level of the core voltage, and monitors activity of the circuit to derive an activity level of the circuit; and based on the activity level of the circuit, adjusts a capacitance of the power network or charging parameters associated with the power network to correspond to a power requirement associated with the activity level.

    Cipher system with continuously replenished reservoir of pseudorandom bits

    公开(公告)号:US11128449B2

    公开(公告)日:2021-09-21

    申请号:US16409354

    申请日:2019-05-10

    Applicant: Arm Limited

    Abstract: The described cipher system includes a bits of some randomness (BOSR) reservoir; a first multiplexer circuit that receives a BOSR key, a functional key, and a first control signal for selection between the BOSR key and the functional key; a second multiplexer circuit that receives a BOSR state, a functional state, and a second control signal for selection between the BOSR state and the functional state; a block cipher logic circuit that receives the outputs from the first and second multiplexer circuits and a functional input. The block cipher outputs bits into either the BOSR reservoir or as a functional output according to a third control signal. The cipher system includes a control logic block that outputs the first control signal, second control signal, and third control signal and controls whether a clock cycle of the block cipher logic circuit is used for a BOSR operation or a functional operation.

    Tracking events of interest
    9.
    发明授权

    公开(公告)号:US11119840B2

    公开(公告)日:2021-09-14

    申请号:US16409314

    申请日:2019-05-10

    Applicant: Arm Limited

    Abstract: A system for tracking events of interest can include at least one volatile counter; a nonvolatile storage coupled to the at least one volatile counter, the nonvolatile storage storing a bit for each top volatile count number of events identified by the at least one volatile counter; a backup power source coupled to the at least one volatile counter; and readout circuitry and control logic coupled to the one or more of the at least one volatile counter and to the nonvolatile storage, the readout circuitry and control logic being configured to control operations of the at least one volatile counter during an error event and determine a total number of events.

    Detection of frequency modulation of a secure time base

    公开(公告)号:US11043102B1

    公开(公告)日:2021-06-22

    申请号:US16244502

    申请日:2019-01-10

    Applicant: Arm Limited

    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.

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