Power consumption control system

• US 5,461,266 A
• Filed: 11/27/1991
• Issued: 10/24/1995
• Est. Priority Date: 11/27/1990
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Koreeda, Hiroyuki, Taniguchi, Shigeki, Nakane, Keiichi, Nonaka, Naomichi, Kuwabara, Tadashi
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): Krishnan, Aditya
• Application Number:
  US07/798,891
• Time in Patent Office: 1,427 Days
• Field of Search: 307/139, 307/140, 307/141, 307/141.8, 307/153, 307/154, 307/125, 307/128, 307/34, 307/35, 307/38, 395/750
• US Class Current: 307/125
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3228 Monitoring task completion, e.g. by use of idle timers, stop commands or wait commands
• CPC Class Codes: G06F 1/3237 by disabling clock generation or distribution
• CPC Class Codes: G06F 1/324 by lowering clock frequency
• CPC Class Codes: G06F 1/325 Power saving in peripheral device
• CPC Class Codes: G06F 1/3287 by switching off individual functional units in the computer system
• CPC Class Codes: G06F 9/3869 Implementation aspects, e.g. pipeline latches; pipeline synchronisation and clocking
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

Control is performed for each of the individual components in accordance with a table including information on clock control and power control of each component of an information processing apparatus. Clock supply is stopped or clock frequency is lowered immediately or after the lapse of a predetermined period of time since the component is brought into an unused condition. Supply of power is stopped immediately or after the lapse of a predetermined period of time. In this case, the predetermined period of time can be automatically adjusted by detecting the condition of access to the component.

Claims

1. A system for controlling power consumption for an information processing apparatus, comprising:

first power saving means which comprises;

clock supply control means for controlling supply and stoppage of clock signals to individual ones of a plurality of components of said information processing device,

clock supply stopping means for determining whether or not stoppage of clock signals supplied to a particular one of said components can be performed when said particular component is brought into an unused condition and for instructing said clock supply control means to stop supplying clock signals to said particular component if it is determined that said supply of clock signals to said particular component can be stopped,

clock supply commencing means for instructing said clock supply control means to commence the supply of clock signals to said particular component to which said clock signal supply has been stopped, when said particular component is brought into a used condition;

second power saving means which comprises;

power supply control means for controlling supply and stoppage of power to individual components of said information processing device,

power supply stopping means for determining whether or not stoppage of power supply to said particular component can be performed when said particular component is brought into an unused condition and for instructing said power supply control means to stop said power supply to said particular component if it is determined that said supply of power to said particular component can be stopped,

power supply commencing means for instructing said power supply control means to commence said power supply to said particular component which said power supply has been stopped, when said particular component is brought into a used condition; and

clock switching means for switching a frequency of said clock signals to a normal operating value or a value which is lower than said normal operating value;

wherein

said clock supply stopping means instructs said clock switching means to switch said clock signal frequency into said value lower than said normal operating value when said clock signal supply has been stopped, and

said clock supply commencing means instructs said clock switching means to recover said clock signal frequency to said normal operating value when said particular component, which has had said clock frequency lowered, is brought into a used condition.

2. A system for controlling power consumption for an information processing apparatus as defined in claim 1, wherein:

said clock supply stopping means determines whether or not said clock supply to said particular component should be immediately stopped and instructs said clock supply control means to stop said clock supply to said component if said clock supply to said particular component should be stopped and instructs said clock supply control means to stop said clock supply to said particular component when said particular component has not been used for a period of time which is predetermined for each of said plurality of components if said clock supply should not be immediately stopped; and

said power supply stopping means determines whether or not said power supply to said particular component should be immediately stopped and instructs said power supply control means to stop said power supply to said particular component if said power supply to said particular component should be stopped and instructs said power supply control means to stop said power supply to said particular component when said particular component has not been used for a period of time which is predetermined for each of said plurality of components if said power supply should not be immediately stopped.

3. A power consumption controlling apparatus for an information processing device as defined in claim 1, further comprising an arithmetic processing unit having clock input stopping means for stopping input of clock signals supplied from said clock supply control means when there is no processing to be executed and clock input commencing means for commencing input of clock signals supplied from said clock supply control means when an interrupt is externally generated.

4. A system for controlling power consumption for an information processing apparatus in which groups of components are referred to as logical resources, each group implements a series of processing operations and manages usage conditions of said resources, said power consumption controlling system comprising:

resource managing means for holding a corresponding relationship between each resource and those of said components related therewith and information regarding power control for each of said components;

clock supply control means for controlling the supplying and stoppage of clock signals for each of said components;

power supply control means for controlling the supplying and stoppage of power for each of said components;

clock supply commencing means for instructing said clock supply control means to commence the clock signal supply to a particular one of said components if said clock signal supply to said particular component related to a corresponding resource is stopped when use of said resource is commenced by one of said processing operations;

clock supply stopping means for determining whether or not said clock signal supply to said particular component should be immediately stopped if said particular component related to said resource is not used by other of said processing operations when use of said resource is terminated and for instructing said clock supply control means to stop the supply of clock signals to said particular component if said clock supply stopping means determines that said clock signal supply should be immediately stopped and for instructing said clock supply control means to stop said supply of clock signals to said particular component when said particular component has not been used for a period of time which is predetermined for each of said components if said clock supply should not be immediately stopped;

power supply commencing means for instructing said power supply control means to commence power supply to said particular component if said power supply to said particular component related to said resource is stopped when use of the resource is commenced by one of said processing operations;

power supply stopping means for determining whether or not said power supply to said particular component should be immediately stopped if said particular component related to said resource is not used by other processing operations when use of said resource is terminated and for instructing said power supply control means to stop the supply of power to said particular component if said power supply stopping means determines that said power supply should be immediately stopped and for instructing said power supply control means to stop said supply of power to said particular component when said particular component has not been used for a period of time which is predetermined for each of said components if said power supply should not be immediately stopped.

5. A system for controlling the power consumption of an information processing apparatus as defined in claim 4 in which said resource managing means comprises:

information representative of whether or not clock signal is supplied to each of said components related with each particular resource;

information representative of whether or not power is supplied to each of said components related with each particular resource;

information representative of whether or not clock signals supplied to each of said components related with each particular resource should be immediately stopped when said component is brought into an unused condition;

a value representative of a period of time at the end of which said supply of clock signals to said component is stopped if said clock signal supply to each component related with each particular resource should not be immediately stopped when said component is brought into an unused condition;

information representative of whether or not power supply to each of said components related with each particular resource should be immediately stopped when said component is brought into an unused condition; and

a value representative of a period of time at the end of which said power supply to said component is stopped if said power supply to said component related with each particular resource should not be immediately stopped when said component is brought into an unused condition.

6. An information processing device including:

means for detecting an operating condition of said device;

means for switching on or off a power supply to said device;

means for measuring time; and

controlling means for controlling said switching means to switch off said power supply to said device if said control means confirms, based upon a detected result of said time measuring means and an input from said time measuring means, that said device has been in a predetermined condition for a predetermined amount of monitor time to switch on said power supply to said device when said control means confirms, based upon the result of detection of said detecting means, that said device has been out of the predetermined condition, wherein said control means changes said predetermined amount of said monitor time based upon the detected result of said detecting means.

7. An information processing apparatus as defined in claim 6, wherein said control means has maximum and minimum monitor times which are upper and lower limits of the monitor times and changes said monitor time within a range between the maximum and minimum times.

8. An information processing apparatus as defined in claim 6, wherein said control means has a reference monitor time which is used as a reference of the monitor time, compares an interval since the power is turned off and until the power is turned on with the reference monitor time and extends or shortens the monitor time if the reference monitor time is longer or shorter, respectively.

9. An information processing apparatus as defined in claim 6 in which changing of said monitor time is carried out by extending or shortening the monitor time by a predetermined period of time.

10. A power consumption control apparatus for use in an information processing apparatus having an arithmetic processing unit which controls the intended information processing and an input/output device which is controlled by said arithmetic processing unit, said power consumption control apparatus comprises:

means for determining whether or not there is information processing to be executed by said arithmetic processing unit;

means for immediately stopping a supply of clock signals to said arithmetic processing unit when there are no such information processing to be executed; and

means for immediately resuming said clock supply in response to an external signal applied to said input/output device.

11. In a power consumption control system including an information processing apparatus which has a device pause means that halts the clock supply or the power supply of a hardware device and a device resume means that resumes the clock supply or the power supply of said hardware device, a power consumption control system comprises:

resource power control means for determining whether or not each hardware resource to be used by the apparatus is being used, and instructing power reduction to respective ones of said hardware resources when the respective ones of said hardware resource are not being used and instructing the halt of power reduction when the respective ones of said hardware resources are being used; and

device power consumption control means for executing the device pause means of the hardware resources when instructed to reduce power, and executing the device resume means of each hardware resource when instructed to stop the power reduction.