摘要:
The present invention provides a hardware accelerator, which allows faster switching between processing modes. In an information processing device with a bytecode accelerator BCA for translating a stack-based intermediate code (bytecode) into register-based instructions, a selector SEL for switching between BCA and soft VM is posed between an instruction part FET and a decode part DEC and data transfer paths P4 and P5 are formed between BCA and the register file REG_FILE. When bytecode accelerator BCA is activated, the P3 side is selected by the selector SEL and the translated CPU instructions are transferred to the decode part DEC. If the intermediate language code cannot be translated by the BCA, the processing mode is switched to software processing. During switching between the modes, internal information of BCA can be transferred between BCA and REG_FILE in parallel, achieving faster mode switching.
摘要:
A method and apparatus are provided for event detection for a multiple instruction-set processor. In one example of the apparatus, a data processing device comprises an instruction execution device configured to execute a first instruction set as specific instructions; an instruction conversion circuit configured to convert instructions of a second instruction set into a first instruction string of the first instruction set, and further configured to supply the first instruction string to the instruction execution device; and a counter device configured to count a prescribed event, wherein the instruction conversion circuit is further configured to output a prescribed instruction when the counter device is satisfied by a prescribed condition.
摘要:
A hardware accelerator is used to execute a floating-point byte-code in an information processing device. For a floating-point byte-code, a byte-code accelerator BCA feeds an instruction stream for using a FPU to a CPU. When the FPU is used, first the data is transferred to the FPU register from a general-purpose register, and then an FPU operation is performed. For data, such as a denormalized number, that cannot be processed by the FPU, in order to call a floating-point math library of software, the processing of the BCA is completed and the processing moves to processing by software. In order to realize this, data on a data transfer bus from the CPU to the FPU is snooped by the hardware accelerator, and a cancel request is signaled to the CPU to inhibit execution of the FPU operation when 4corresponding data is detected in a data checking part.
摘要:
A hardware accelerator is used to execute a floating-point byte-code in an information processing device. For a floating-point byte-code, a byte-code accelerator BCA feeds an instruction stream for using a FPU to a CPU. When the FPU is used, first the data is transferred to the FPU register from a general-purpose register, and then an FPU operation is performed. For data, such as a denormalized number, that cannot be processed by the FPU, in order to call a floating-point math library of software, the processing of the BCA is completed and the processing moves to processing by software. In order to realize this, data on a data transfer bus from the CPU to the FPU is snooped by the hardware accelerator, and a cancel request is signaled to the CPU to inhibit execution of the FPU operation when corresponding data is detected in a data checking part.
摘要:
A bytecode accelerator which translates stack-based intermediate language (bytecodes) into register-based CPU instructions transfers plural pieces of internal information from a register file of a CPU to the bytecode accelerator by means of an internal transfer bus between the bytecode accelerator-and the CPU and an input selection logic of the bytecode accelerator when the bytecode accelerator is started and transfers plural pieces of internal information in the bytecode accelerator to the register file of the CPU by means of the internal transfer bus, an output selector and an output selector selection logic of the bytecode accelerator when the bytecode accelerator ends its operation in transition between hardware processing and software processing by software virtual machine.
摘要:
A bytecode accelerator which translates stack-based intermediate language (bytecodes) into register-based CPU instructions transfers plural pieces of internal information from a register file of a CPU to the bytecode accelerator by means of an internal transfer bus between the bytecode accelerator and the CPU and an input selection logic of the bytecode accelerator when the bytecode accelerator is started and transfers plural pieces of internal information in the bytecode accelerator to the register file of the CPU by means of the internal transfer bus, an output selector and an output selector selection logic of the bytecode accelerator when the bytecode accelerator ends its operation in transition between hardware processing and software processing by software virtual machine.
摘要:
Disclosed here is an information processing system capable of recognizing actions and circumstances of a user with respect to both space and time as a “situation” to recognize the user's request using a plurality of sensing nodes that work cooperatively with each another, thereby responding autonomously to the user's request according to the recognition results. The plurality of sensing nodes and a responding device are disposed in a target space to build up a network for recognizing the situation in the target space. And, a plurality of recognition means are used to recognize the situation with respect to both space and time related to the existence of the user. And, an integral processing portion (master) is selected from among the plurality of sensing nodes, thereby dispersing the system load. If there are a plurality of users, the system can make recognition in accordance with the request of each of those users.
摘要:
In a low power consumption mode in which prior data is retained upon power shutdown, the return speed thereof is increased. While use of an existent data retaining flip-flop may be considered, this is not preferred since it increases area overhead such as enlargement of the size of a cell. A power line for data retention for power shutdown is formed with wirings finer than a usual main power line. Preferably, power lines for a data retention circuit are considered as signal lines and wired by automatic placing and mounting. For this purpose, terminals for the power line for data retention are previously designed by providing the terminals therefor for the cell in the same manner as in the existent signal lines. Additional layout for power lines is no longer necessary for the cell, which enables a decrease in the area and design by an existent placing and routing tool.
摘要:
When a leakage current of a circuit block under a non-use state is reduced by means of a power switch, frequent ON/OFF operations of the switch within a short time invite an increase of consumed power, on the contrary. Because a pre-heating time is necessary from turn-on of the switch till the circuit block becomes usable, control of the switch during an operation deteriorates a processing time of a semiconductor device. The switch is ON/OFF-controlled with a task duration time of a CPU core for controlling logic circuits and memory cores as a unit. After the switch is turned off, the switch is again turned on before termination of the task in consideration of the pre-heating time.
摘要:
An information processing device, including: a processing unit; a peripheral circuit module; and a boot address register, wherein the information processing device comprises a first operation mode and a second operation mode having an operating current which is lower than that of said first operation mode, wherein the boot address register holds an address of an instruction to be executed by said processing unit first when the boot address register returns from said second operation mode to said first operation mode, wherein the address is output from said boot address to the processing unit when said information processing device shifts from said second operation mode to said first operation mode.