Information processing apparatus and method

• US 20050188142A1
• Filed: 11/24/2004
• Published: 08/25/2005
• Est. Priority Date: 02/23/2004
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Nakajima, Kenji
• Application Number:
  US10/997,416
• Publication Number:
  US 20050188142A1
• Time in Patent Office: Days
• US Class Current: 710/303
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3287 by switching off individual functional units in the computer system
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

An information processing apparatus is provided with an LCD display, an MO drive and a memory card slot, with a main processor putting the USB bridge subprocessor into an active state to cause the USB bridge subprocessor to execute input/output processing from/to a host when the main processor judges the host to be connected, and putting the USB bridge subprocessor into an inactive state to cause the information processing apparatus to execute a standalone operation when the main processor judges a processing request from an operation unit to be present. The main processor pulls up a specific signal line connecting the USB bridge subprocessor and the host to put the USB bridge subprocessor into an active state.

Claims

1. An information processing apparatus comprising:

a subprocessor operable to execute input/output processing from/to an upper-level apparatus; and

a main processor operable to disable a standalone operation so as to put the subprocessor into an active state when judging the upper-level apparatus to be connected, the main processor putting the subprocessor into an inactive state to allow the information processing apparatus to execute the standalone operation when judging an instruction request from an operation unit to be present.

2. The information processing apparatus of claim 1, wherein

the subprocessor executes, as the input/output processing from/to the upper-level apparatus, data transfer to write data to or read data from a storage unit based on a command from the upper-level apparatus, and wherein

the main processor executes, as the standalone operation of the information processing apparatus, tasks such as data transfer between different storage units, data transfer from the storage unit to a display unit and expansion of compressed image data for display on the display unit.

3. The information processing apparatus of claim 1, wherein

the main processor pulls up a specific signal line connecting the subprocessor and the upper-level apparatus to put the subprocessor into an active state, and wherein the main processor pulls down the specific signal line to put the subprocessor into an inactive state.

4. The information processing apparatus of claim 1, wherein

the main processor turns on power supply to the subprocessor to put the subprocessor into an active state, and wherein

the main processor turns off the power supply to put the subprocessor into an inactive state.

5. The information processing apparatus of claim 1, wherein

the main processor turns off a reset signal to the subprocessor to put the subprocessor into an active state, and wherein the main processor turns on the reset signal to put the subprocessor into an inactive state.

6. The information processing apparatus of claim 1, wherein

when recognizing the connection to the upper-level apparatus at the startup by power-up of the information processing apparatus, the main processor puts the subprocessor into an active state, and wherein

when recognizing the non-connection to the upper-level apparatus, the main processor puts the subprocessor into an inactive state to enable the standalone operation until recognizing the connection.

7. The information processing apparatus of claim 1, wherein

at the startup by power-up of the information processing apparatus, the main processor selects, based on user-set information, whether to put the subprocessor into an active state or render the subprocessor inactive to enable the standalone operation.

8. The information processing apparatus of claim 1, wherein

when judging a standalone operation instruction from the operation unit to be present at the startup by power-up of the information processing apparatus, the main processor renders the subprocessor inactive to enable the standalone operation, and wherein

when judging the standalone operation instruction to be absent at the startup by power-up of the information processing apparatus, the main processor puts the subprocessor into an active state.

9. The information processing apparatus of claim 1, wherein

when judging both a processing request from the upper-level apparatus and a processing request from the operation unit to be present, the main processor controls the subprocessor to switch between active and inactive states so as to alternately execute the processing requests from the upper-level apparatus and the operation unit through time sharing or sharing on a command-by-command basis.

10. The information processing apparatus of claim 9, wherein

at the time of alternately executing the processing request from the upper-level apparatus and the processing request from the operation unit, the main processor, while executing one of the processing requests, transfers data to a data buffer for the other processing request suspended.

11. The information processing apparatus of claim 1, further comprising a plurality of the subprocessors each operable to individually connect a plurality of the upper-level apparatuses, wherein

the main processor controls the individual subprocessors to switch between active and inactive states so as to allow the plurality of the subprocessors to execute processing requests from the plurality of the upper-level apparatuses through time sharing or sharing on a command-by-command basis.

12. An information processing method of a main processor executing a standalone operation of an information processing apparatus while at the same time monitoring a subprocessor that executes input/output processing from/to an upper-level apparatus, the method comprising:

when the upper-level apparatus is judged to be connected thereto, disabling the standalone operation and putting the subprocessor into an active state to allow the subprocessor to execute the input/output processing from/to the upper-level apparatus; and

when a processing request from an operation unit is judged to be present, putting the subprocessor into an inactive state to allow the information processing apparatus to perform the standalone operation.

13. The information processing method of claim 12, wherein

the main processor causes the subprocessor to perform, as the input/output processing from/to the upper-level apparatus, data transfer to write data to or read data from a storage unit based on a command from the upper-level apparatus, and wherein

the main processor executes, as the standalone operation of the information processing apparatus, tasks such as data transfer between different storage units, data transfer from the storage unit to a display unit and expansion of compressed image data for display on the display unit.

14. The information processing method of claim 12, wherein

the main processor turns on power supply to the subprocessor to put the subprocessor into an active state, and wherein

the main processor turns off the power supply to put the subprocessor into an inactive state.

15. The information processing method of claim 12, wherein

the main processor turns off a reset signal to the subprocessor to put the subprocessor into an active state, and wherein the main processor turns on the reset signal to put the subprocessor into an inactive state.

16. The information processing method of claim 12, wherein

the main processor pulls up a specific signal line connecting the subprocessor and the upper-level apparatus to put the subprocessor into an active state, and wherein the main processor pulls down the specific signal line to put the subprocessor into an inactive state.

17. The information processing method of claim 12, wherein

when recognizing the connection to the upper-level apparatus at the startup by power-up of the information processing apparatus, the main processor puts the subprocessor into an active state, and wherein

when recognizing the non-connection to the upper-level apparatus, the main processor puts the subprocessor into an inactive state to enable the standalone operation until recognizing the connection.

18. The information processing method of claim 12, wherein

at the startup by power-up of the information processing apparatus, the main processor selects, based on user-set information, whether to put the subprocessor into an active state or render the subprocessor inactive to enable the standalone operation.

19. The information processing method of claim 12, wherein

when judging a standalone operation instruction from the operation unit to be present at the startup by power-up of the information processing apparatus, the main processor renders the subprocessor inactive to enable the standalone operation, and wherein

when judging the standalone operation instruction to be absent at the startup by power-up of the information processing apparatus, the main processor puts the subprocessor into an active state.

20. The information processing method of claim 12, wherein

when duplicately making a processing request from the upper-level apparatus and a processing request from the operation unit, the main processor controls the subprocessor to switch between active and inactive states so as to alternately execute the processing requests from the upper-level apparatus and the operation unit through time sharing or sharing on a command-by-command basis.

21. The information processing method of claim 12, wherein

at the time of alternately executing the processing request from the upper-level apparatus and the processing request from the operation unit, the main processor, while executing one of the processing requests, transfers data to a data buffer for the other processing request suspended.

22. The information processing method of claim 12, wherein

a plurality of the subprocessors are provided each operable to individually connect a plurality of the upper-level apparatuses, wherein

the main processor controls the individual subprocessors to switch between active and inactive states so as to allow the plurality of the subprocessors to execute processing requests from the plurality of the upper-level apparatuses through time sharing or sharing on a command-by-command basis.