Abstract:
A dynamic power controller is provided that identifies a clock frequency requirement of a processor and determines a voltage requirement to support the clock frequency requirement. The dynamic power controller transitions the processor to a power state defined by the clock frequency requirement and the voltage requirement. In particular, a voltage level indicated by the voltage requirement is supplied to the processor and the frequency distribution indicated by the frequency requirement is provided to the clocks signals of the processor.
Abstract:
Methods and apparatus for accessing flash memory in a continued burst mode are provided. The apparatus includes a processor for executing instructions including memory access instructions, the processor generating a next access signal that indicates if a next memory access is in sequence with a current memory access, a memory having a continued burst mode of operation, and a bus interface for controlling access to the memory in response to the memory access instructions. The bus interface unit enables the continued burst mode of the memory while the next access signal is asserted.
Abstract:
A processor may support a self-nesting mode in which an interrupt may preempt another interrupt of the same priority level. The execution of an interrupt service routine (ISR) for an interrupt may be deferred until the ISR for a subsequently received interrupt of the same priority level is completed.
Abstract:
A digital baseband processor is provided which receives a system clock generated by a system oscillator and generates a plurality of clock signals from the system clock. The digital baseband processor includes a digital signal processor for executing digital signal processor instructions, a microcontroller for executing microcontroller instructions, and other modules which may require one of the plurality of clock signals for operation. The digital baseband processor also includes a power management circuit which may power down the system oscillator when modules such as the digital signal processor and microcontroller do not require clock signals derived from the system oscillator. The power management circuit may gate off clock signals to modules when those modules do not require clock signals, without powering down the system oscillator.
Abstract:
Methods and apparatus for accessing flash memory in a continued burst mode are provided. The apparatus includes a processor for executing instructions including memory access instructions, the processor generating a next access signal that indicates if a next memory access is in sequence with a current memory access, a memory having a continued burst mode of operation, and a bus interface for controlling access to the memory in response to the memory access instructions. The bus interface unit enables the continued burst mode of the memory while the next access signal is asserted.
Abstract:
Methods and apparatus are provided for operating an embedded processor system that includes a processor and a cache memory. The method includes filling one or more lines in the cache memory with data associated with a first task, executing the first task, and, in response to a cache miss during executing of the first task, performing a cache line fill operation and, during the cache line fill operation, executing a second task. The cache memory may notify the processor of the line fill operation by generating a processor interrupt or by notifying a task scheduler running on the processor.