Method and system for improved power management in information p

Details Method and system for improved power management in information p Method and system for improved power management in information p

1996-07-01

1999-12-07

Sheikh, Ayaz R.

Electrical computers and digital processing systems: support

Computer power control

Power conservation

713323, 713322, G06F 100

Patent

active

06000035&

ABSTRACT:
An information processing system that can reduce the operating frequency of a CPU, or halt the operation of the CPU, at an adequate timing, even when the system is engaged in exchanging data with another independent apparatus (e.g., another PC) via a communication port (a serial port or a parallel port), or when a communication application is being executed. The system has (a) a CPU that operates in a normal mode, in a power saving mode in which less power is consumed than is required in a normal mode, or in a stop mode in which operation is completely halted; (b) at least one peripheral device; (c) a bus employed for communication between the CPU and the peripheral device; (d) a communication port, physically connected to another independent apparatus, for performing data transfer; (e) a bus cycle detector monitoring a bus cycle on the bus; (f) a state detector determining an operational mode of the CPU in response to a detection by the bus cycle of access of the communication port; (g) a signal generator providing, when the state detector ascertains that the operational mode is to be the power saving mode, a control signal to the CPU to set the CPU to the power saving mode; and (h) a CPU operation halting signal completely halting an operation of the CPU when the state determination means ascertains that the operational mode is to be the stop mode.

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"Method to provide low power standby mode for online devices" by R.C. Schwartz, IBM Technical Disclosure Bulletin, vol. 29, No. 11, Apr. 1987, p. 4763.

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