Abstract:
PROBLEM TO BE SOLVED: To provide a memory module that reconciles high performance and low power consumption. SOLUTION: The memory module, which generates an internal clock synchronized with an external clock and operates on the internal clock as an operating clock, comprises a first DLL circuit for generating a first internal clock from an external clock of a first frequency bandwidth, a second DLL circuit for generating a second internal clock from an external clock of a second frequency bandwidth different from the first frequency bandwidth, and a selector for selecting either the first internal clock generated by the first DLL circuit or the second internal clock generated by the second DLL circuit to output it as the operating clock of the memory module. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To reduce power consumption at shutdown time in a computer device with a battery. SOLUTION: This computer device includes an AC adapter constituted connectably to a computer system by a power supply circuit 50 of the computer system and supplying a power to the system, a main battery 57 and a second battery 58 constituted connectably to the computer system and supplying the power to the system by discharging after charging by the power from the AC adapter 51, and a gate array circuit 62 turning off the power supply to a charger 56, or a charge circuit of the main battery 57 and/or the second battery 58, and an embedded controller 63, when the main battery 57 and/or the second battery 58 is connected to the AC adapter 51. COPYRIGHT: (C)2004,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a superior information processing system which can drop or stop the operation frequency of CPU at appropriate timing even while asynchronous communication is executed with a peripheral equipment. SOLUTION: This system includes a CPU 11 which can be operated at a regular mode and a power saving mode whose power consumption is lower than the regular mode, one or more peripheral equipments 17, 23, buses 12, 16 and 22 for making communication between the peripheral equipments 17, 23 and CPU 11, a bus cycle detection means for monitoring a bus cycle on the buses, a state judgment means for deciding the operation mode of the CPU 11 in a specified bus cycle detected by the bus cycle detection means and a signal generation means for transmitting a control signal for switching the operation mode based on a judgment result by the state judgment means to the CPU 11.
Abstract:
PROBLEM TO BE SOLVED: To reduce the power consumption of an information processor without making its processing performance lower than before. SOLUTION: The information processor that controls data transfer between devices is provided having an operational mode determining part for determining whether the information processor is to be operated in a normal mode or a power-saving mode according to the state of the power of the information processor, and a data transfer setting part that, when the information processor is determined to be operated in the power-saving mode, compares the state of the information processor in the mode with the state of the processor in the normal mode and sets the number of signal lines used in the data transfer at a smaller value. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To protect various devices of a computer from physical shocks by controlling the changeover of a system state in ACPI (advanced configuration and power interface) or the like on the basis of the existence of physical motion such as vibration and movement of the computer. SOLUTION: An embedded controller 41 judges whether a computer device body performs motion (vibration, movement, rotation, etc.) or not on the basis of acceleration information obtained by an acceleration sensor 60 built in the computer device body. When the computer device body performs motion, the embedded controller 41 controls the changeover of a system state by an I/O bridge so as to be temporarily extended. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To lower power consumption of an information processing device further by effectively combining a technology for changing an operation frequency and an operation voltage of a central processing unit according to a computing operation load and a technology for lowering power consumption by stopping clock supply to the central processing unit together. SOLUTION: In this information processing device provided with the central processing unit having an instruction execution part executing an instruction, the central processing unit is provided with an ordinary mode for operating the instruction execution part and an execution stopping mode for stopping the instruction execution part. This information processing device is provided with a voltage control part, which makes the instruction execution part operate a voltage lowering instruction for a shift to a low voltage operation mode lowering an operation voltage of the central processing unit in comparison with that in the ordinary mode when the central processing unit is shifted from the ordinary mode to the execution stopping mode, and a mode control part shifting the central processing unit to a low voltage operation stopping mode stopping the instruction execution part with the operation voltage of the low voltage operation mode when the central processing unit is shifted to the low voltage operation mode by the voltage control part. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a practical means for restraining electric power consumption by reducing operational performance of a CPU, and restraining the electric power consumption and generation of heat of the whole system when the CPU requires waiting time in the relationship with a device and is processing a program. SOLUTION: A command code executed by the CPU 101 and information on the operational performance when executing this command code are loaded in the CPU 101, and the operational performance of the CPU 101 is dynamically set to a value determined on the basis of the loaded information on the operational performance so that the CPU 101 executes this command code by the preset operational performance. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a superior information processing system with a power management function which reduce the power consumption by adequately lowering or stopping the operating frequency of a CPU by providing a power-saving means which places the CPU in power-saving mode for a specific time after the end of a transaction. SOLUTION: The CPU and a peripheral equipment are driven asynchronously and while the both communicate with each other, an interruption request is generated for a handshake and the CPU should respond speedily to the interruption request. The CPU, however, is in a mere wait state for the specific period after a specific transaction ends and the timing of the generation of a next interruption request is previously known. In this wait state, the operation of the CPU is lowered to save the electric power and the CPU is put back to its normal mode before an interruption request is generated to keep the maintainability of the system.