摘要:
A digital system and method of operation is which the digital system has a processor with a virtual machine environment for interpretively executing instructions. First, a sequence of instructions is received (404) for execution by the virtual machine. The sequence of instructions is examined (408–414) to determine if a certain type of iterative sequence is present. If the certain type of iterative sequence is present, the iterative sequence is replaced (412) with a proprietary code sequence. After the modifications are complete, the modified sequence is executed in a manner that a portion of the sequence of instructions is executed in an interpretive manner (418); and the proprietary code sequences are executed directly by acceleration circuitry (420).
摘要:
A digital system and method of operation is provided in which several processors (740(0)–740(n)) are connected to a shared resource (750). Each processor has an access priority register (1410) that is loaded with an access priority value by software executing on the processor. A memory management unit (MMU) (700) is connected to receive a request address (742) from each respective processor. The MMU has a set of entries that correspond to pages of address space. Each entry provides a set of attributes for the associated page of address space, including an address space priority value 309a. For each request, the MMU accesses an entry corresponding to the request address and provides an address space priority value associated with that requested address space page. Arbitration circuitry (1430) is connected to receive a request signal from each processor along with the access priority value from each access priority register and the address space priority value from each MMU. The arbitration circuitry is operable to schedule access to the shared resource according to higher of the pair of priority values provided by each processor.
摘要:
An electronic device that comprises a processor including an individual instruction and a first group of instructions. The device further comprises a memory externally coupled to the processor, as well as a second group of instructions. When executed, the first group of instructions causes the processor to execute the second group of instructions in lieu of the individual instruction.
摘要:
A processor executes an instruction that causes a source data field from a programmable position within a first source register to be copied to a destination register. The instruction is particularly useful for generating media-based bitstreams (e.g., audio, video). In some embodiments, a system (e.g., a communication device such as cellular telephone) includes a processor capable of executing the instruction as described above.
摘要:
A processor executes a load (or store) instruction that permits optional error checking to be performed. Based on a control bit in the load instruction, the processor executes the load instruction by causing contents of a source register to be compared to a predetermined value. If the contents of the source register equals the predetermined value, the processor executes an exception handler. However, if the source register contents differs from the predetermined value, the load instruction causes the processor to cause a data value from memory to be loaded into a destination register
摘要:
A processor that comprises decode logic coupled to a first storage unit and comprising a data structure. The processor also comprises a second storage unit coupled to the decode logic. The decode logic obtains a single instruction from the first storage unit and, if indicated by a first bit in the data structure, processes a group of instructions in lieu of the single instruction, the single instruction requiring an operand. If indicated by a second bit in the data structure, the decode logic obtains the operand from the first storage unit and stores the operand to the second storage unit for use by the group of instructions.
摘要:
Systems, methods, and storage media for accessing indirect memory in Java applications are provided. In some embodiments, a storage medium is provided that comprises Java application software that performs one or more operations on an indirect memory of a device. The software comprises instructions that create an instance of a Java class representing the indirect memory, and instructions that access a memory element of the indirect memory using an element unique identifier (“euid”) of the memory element. Other embodiments provide a method for accessing memory elements of a device that comprises creating an instance of a Java class representing the memory elements, and accessing a memory element of the memory elements using an element unique identifier (“euid”) of the memory element, wherein the memory elements are not mapped into the data memory space of the processor.
摘要:
A multiprocessor system (10) includes a plurality of processing modules, such as MPUs (12), DSPs (14), and coprocessors/DMA channels (16). Power management software (38) in conjunction with profiles (36) for the various processing modules and the tasks to executed are used to build scenarios which meet predetermined power objectives, such as providing maximum operation within package thermal constraints or using minimum energy. Actual activities associated with the tasks are monitored during operation to ensure compatibility with the objectives. The allocation of tasks may be changed dynamically to accommodate changes in environmental conditions and changes in the task list. As each task in a scenario is executed, a control word associated with the task can be used to enable/disable circuitry, or to set circuits to an optimum configuration.
摘要:
Protocol processor intended to be associated with at least one main processor of a system with a view to the execution of tasks to which the main processor is not suited. The protocol processor comprises a program part (30) including an incrementation register (31), a program memory (33) connected to the incrementation register (31) in order to receive addresses thereof, a decoding part (35) intended to receive instructions from the program memory (33) of the program part (30) with a view to executing an instruction in two cycles, and a data part (36) for executing the instruction.
摘要:
An interconnection-point memory which includes an array of N1 input buses (Rj) intended to be connected to a first plurality of N1 data-sender devices, an array of N2 output buses (Ck) intended to be connected to a second plurality of N2 data-receiver devices, and interconnection means (17) for connecting the array of input buses to the array of output buses. The interconnection means include on the one hand, a third plurality of N3 switching memories (FIFO m) used as first-in, first-out FIFO devices provided with a write port (Din) and with a read port (Dout), and on the other hand, first control means (S[j,m],24a,24b) for connecting in a virtual manner the input port of at least one switching memory to a specified input bus, and second control means (S[k,m],24a',24b') for connecting in a virtual manner at least one output bus to the read port of the said switching memory, so that the said specified switching memory constitutes a temporary interconnection point, independent of the input buses and output buses to be interconnected. This interconnection-point memory enables Application to the asynchronous transfer of data between senders and receivers.