Abstract: Systems, methods, and apparatus managing access to a power management device are disclosed. A system has a primary integrated circuit and a power management integrated circuit. The primary integrated circuit has a communication controller configured to control access to a first serial bus for a plurality of subsystems in the primary integrated circuit. The power management integrated circuit is coupled to the first serial bus and to a second serial bus. An access control circuit in the power management integrated circuit is configured by the primary integrated circuit to control access to the power management integrated circuit through the second serial bus. The primary integrated circuit may be configured to write an access control configuration to the power management integrated circuit. The access control configuration may define write access rights for a secondary integrated circuit coupled to the power management integrated circuit through the second serial bus.

Abstract: A storage device is pre-loaded with an access block including a list of device addresses with which the device is either permitted or not permitted to communicate over a shared bus prior to a bootloader being initiated on the device. A communication circuit is coupled to the storage device, and the circuit is adapted to: (a) obtain a first command to be transmitted over the shared bus to a first device address; (b) determine whether the first device address is in the list of device addresses in the access block; and (c) allow or prevent transmission of the first command over the shared bus based on whether the firt device address is in the list of device addresses. The list of device addresses is bypassed or ignored after the bootloader procedure is completed.

Abstract: Systems, methods, and apparatus for communicating a control signal between device components are provided. Within an apparatus, an integrated circuit (IC) sends a control signal to a system on chip (SoC). The control signal requests enablement or disablement of one or more resources corresponding to the IC. Thereafter, a converting circuit within the SoC converts the control signal from the IC into a command to be transmitted to one or more devices. The converting circuit then transmits the command to the one or more devices via a bus coupling the SoC to the one or more devices. The one or more devices includes one or more power management integrated circuits (PMICs) configured to control the one or more resources.