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    3.
    发明专利
    未知

    公开(公告)号：DE69332940D1

    公开(公告)日：2003-06-12

    申请号：DE69332940

    申请日：1993-03-25

    Applicant: IBM

    Inventor： KANNAN KRISHNAMURTHI ,  LEONTIADES KYRIAKOS ,  NOVAK FRANK PETER ,  SHARMA VIKRAM

    IPC: G06F3/041 ,  G06F3/038 ,  G06F3/033

    Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.

    4.
    发明专利
    未知

    公开(公告)号：DE69332940T2

    公开(公告)日：2004-03-11

    申请号：DE69332940

    申请日：1993-03-25

    Applicant: IBM

    Inventor： KANNAN KRISHNAMURTHI ,  LEONTIADES KYRIAKOS ,  NOVAK FRANK PETER ,  SHARMA VIKRAM

    IPC: G06F3/041 ,  G06F3/038 ,  G06F3/033

    Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.

    7.
    发明专利
    未知

    公开(公告)号：BR9301338A

    公开(公告)日：1993-10-19

    申请号：BR9301338

    申请日：1993-03-29

    Applicant: IBM

    Inventor： KANNAN KRISHNAMURTHI ,  LEONTIADES KYRIAKOS ,  NOVAK FRANK P ,  SHARMA VIKRAM

    IPC: G06F3/041 ,  G06F3/038 ,  G06F13/00

    Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.

    SYSTEM TO SERVICE PROCESSOR INTERFACE FOR A TABLET COMPUTER
    8.
    发明专利
    SYSTEM TO SERVICE PROCESSOR INTERFACE FOR A TABLET COMPUTER 未知

    公开(公告)号：CA2090709C

    公开(公告)日：1998-09-29

    申请号：CA2090709

    申请日：1993-02-23

    Applicant: IBM

    Inventor： NOVAK FRANK PETER ,  KANNAN KRISHNAMURTHI ,  LEONTIADES KYRIAKOS ,  SHARMA VIKRAM

    IPC: G06F3/041 ,  G06F3/038 ,  G06F3/033

    Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.

    SYSTEM TO SERVICE PROCESSOR INTERFACE FOR A TABLET COMPUTER
    9.
    发明专利
    SYSTEM TO SERVICE PROCESSOR INTERFACE FOR A TABLET COMPUTER 未知

    公开(公告)号：CA2090709A1

    公开(公告)日：1993-10-16

    申请号：CA2090709

    申请日：1993-02-23

    Applicant: IBM

    Inventor： KANNAN KRISHNAMURTHI ,  LEONTIADES KYRIAKOS ,  NOVAK FRANK P ,  SHARMA VIKRAM

    IPC: G06F3/041 ,  G06F3/038 ,  G06F3/033

    Abstract: A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred. The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.

    SYSTEM FOR DISTRIBUTED POWER MANAGEMENT IN PORTABLE COMPUTERS
    10.
    发明专利
    SYSTEM FOR DISTRIBUTED POWER MANAGEMENT IN PORTABLE COMPUTERS 未知

    公开(公告)号：CA2087767C

    公开(公告)日：1998-05-05

    申请号：CA2087767

    申请日：1993-01-21

    Applicant: IBM

    Inventor： LEE NATHAN J ,  NOVAK FRANK P ,  LEONTIADES KYRIAKOS ,  KANNAN KRISHNAMURTHI ,  SHARMA VIKRAM ,  JONES CHRISTOPHER D

    IPC: G06F1/26 ,  G06F1/28 ,  G06F1/30 ,  G06F1/32 ,  G06F9/30

    Abstract: The present invention provides a system and method for managing power in a portable, pen-based notebook computer. The system and method provides a means for minimizing power consumption by collecting and interpreting power related data at various processing elements while hiding many of the details from the end-user. The present invention is a system and method for monitoring, collecting and acting upon power-related data in portable computer to maximize the amount of time the portable computer can be used between battery re-charging with minimal user intervention. The present invention is comprised of a plurality of independently controllable power planes which are selectively powered so that the portable computer consumes the minimum power necessary to perform a particular function and a plurality of central processing units (CPUs) operating asynchronously with respect to each other. The present invention is further comprised of an on/off glue logic means for monitoring battery condition, user invoked functions, and system state and a power management means for controlling the operation of each of the CPUs as a function of the conditions sensed by the sensing means.

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