Abstract:
An information processing system achieves power saving by reducing the operating frequency of a CPU, or completely halting the operation of the CPU, at appropriate times during asynchronous communication with peripheral devices. The information processing system comprises: (a) a CPU that is operated in a normal mode during which the CPU is driven at a relatively fast operating clock rate, and a power saving mode during which the operating clock has a lower rate or is halted; (b) at least one peripheral device; (c) a bus for performing communication between the CPU and the peripheral device; (d) termination detection means for detecting a completion of a predetermined transaction between the CPU and the peripheral device; (e) time counting means for measuring a predetermined period of time after the completion of the predetermined transaction; and (f) power saving control means for having the CPU enter the power saving mode until the time counted by the time counting means reaches the predetermined period of time.
Abstract:
PROBLEM TO BE SOLVED: To reduce lowering in processing performance due to control for reducing heat generation. SOLUTION: An information processor is provided with: a plurality of devices each having a high power mode in which power consumption and a processing speed are a higher operation mode and a low power mode in which power consumption and a processing speed are a lower operation mode than the high power mode; a measuring part for measuring the temperature of a predetermined measurement part; a selecting part for selecting a device minimizing the lowering in the processing performance which occurs when the operation mode is changed from the high power mode to the low power mode when the measured temperature is not less than a predetermined reference temperature, resulting in a decrease in the temperature of the measurement part; and an operation mode setting part for changing the operation mode of the selected device from the high power mode to the lower power mode. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To properly prevent the overheating of a memory since calorific values of an LSI and a memory installed in an information processor are increased according as the function of the information processor is improved, and processing is accelerated in speed. SOLUTION: This information processor is provided with a central processing unit, a memory and a memory controller for controlling data transfer between the central processing unit and the memory, and the data transfer rate controller is configured to control the data transfer rate of the memory. The data transfer rate controller is provided with a memory controller temperature detecting part which detects the temperature of the memory controller, an instruction processing quantity detecting part which detects the instruction processing quantity of the central processing unit and a data transfer rate setting part which, when such conditions that the temperature of the memory controller is a predetermined first reference temperature or less, and that an instruction processing quantity is a predetermined instruction processing reference quantity or less are satisfied, compares the data transfer rate set value with that in such a case that the pertinent conditions are not satisfied, and decrease the data transfer rate of the memory. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
An information processing system achieves power saving by reducing the operating frequency of a CPU, or completely halting the operation of the CPU, at appropriate times during asynchronous communication with peripheral devices. The information processing system comprises: (a) a CPU that is operated in a normal mode during which the CPU is driven at a relatively fast operating clock rate, and a power saving mode during which the operating clock has a lower rate or is halted; (b) at least one peripheral device; (c) a bus for performing communication between the CPU and the peripheral device; (d) termination detection means for detecting a completion of a predetermined transaction between the CPU and the peripheral device; (e) time counting means for measuring a predetermined period of time after the completion of the predetermined transaction; and (f) power saving control means for having the CPU enter the power saving mode until the time counted by the time counting means reaches the predetermined period of time.
Abstract:
PROBLEM TO BE SOLVED: To provide an information transmission method and an information transmission device, capable of responding to increase in information for CRTM to be updated, for providing a method for updating CRTM, without needing addition of special hardware for realizing the method. SOLUTION: The information update method for updating CRTM that is a base of chain authentication by use of an information processor adapting the system of ensuring the validity of the whole information processor by performing the chain authentication comprises steps of extracting update CRTM that is information of the CRTM of information to be updated; storing the update CRTM in a main memory of the information processor; authenticating the update CRTM stored in the main memory; and updating the CRTM with the authenticated CRTM. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a superior information processing system which is a type having a power management function for reducing the power consumption by adequately lowering or stopping the operating frequency of a CPU. SOLUTION: The CPU has a normal mode, a power saving mode which is lower in power consumption than the normal mode, and a stop mode where the operation is completely stopped. Then the system has >=1 peripheral equipment and a bus for communicating with the CPU and further has a communication port which is physically connected to other independent equipments and transfers data and a bus cycle detecting means which monitors bus cycles on the bus. In response to the detection of a bus cycle for assessing the communication port, a state decision means determines the operation mode of the CPU. Once the sate decision means determines the power-saving mode, a control signal for placing the CPU in the power-saving mode is sent to the CPU. Further, a control signal for stopping the CPU is sent once the stop mode is determined.
Abstract:
PROBLEM TO BE SOLVED: To provide a data server system and a computer device, capable of accepting access from the external, and surely executing processes, even during its move. SOLUTION: During a move, with since a body PC 10 set to a suspension mode or a hibernation mode, specified operation is made on the hand-held terminal side, and data is read and written from/to only an MRAM 14, which has higher resistance to vibration than an HDD 13 because it has no mechanically moving part. At this time, the MRAM 14 is fed by a power controller 27, so that the HDD 13 having mechanically movable parts is not fed. By detecting whether an AC power supply 26, a LAN cable 40, and a telephone line cable 41 are connected, if whether the body PC 10 is in the middle of during a moving can be determined automatically.
Abstract:
PROBLEM TO BE SOLVED: To automatically and accurately specify respective hard disk drives(HDD) according to their connection state by providing a 1st and a 2nd connector which connect the HDDs and giving priority to the 1st connector when a master and a slave HDD are specified. SOLUTION: A personal computer PC is equipped with the 1st and 2nd connectors 10 and 20 for connecting the HDDs 30. The connectors 10 and 20 have -M/S pins 11 and 21 for setting the connected HDDs 30 as a master or slave and DETECT pins 12 and 22 for detecting whether or not the HDDs 30 are connected. The -M/S pin 11 of the 1st connector 10 is held at a 1st voltage level for setting the connected HDD 30-a as the master. Further, the -M/S pin 21 of the 2nd connector 20 is held at a 2nd voltage for setting the connected HDD 30-b as the slave when the HDD 30-a is connected to the 1st connector 10 and also held at the 1st voltage unless the HDD 30-a is connected to the 1st connector 10.
Abstract:
PROBLEM TO BE SOLVED: To provide a program or the like which permits appropriate selection of a screen saver. SOLUTION: The program is used for making an information processor select the screen saver for displaying a predetermined image on a display device when no input is performed by a user for a predetermined period, and makes the information processor function as: a power source state detecting section 100 which detects the power source state indicating which of an AC power source and a battery is driving the information processor; and a screen saver selection section 150 which selects the screen saver to be operated on the information processor among a plurality of the screen savers in accordance with the state of the power source. COPYRIGHT: (C)2005,JPO&NCIPI