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公开(公告)号：JPS62169537A
公开(公告)日：1987-07-25
申请号：JP27551986
申请日：1986-11-20
Applicant: IBM
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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
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.
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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
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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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
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.
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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
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.
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Patent Agency Ranking
公开(公告)号：DE3687792D1
公开(公告)日：1993-03-25
申请号：DE3687792
申请日：1986-12-18
Applicant: IBM
Inventor： MELTZER CLIFFORD BENNETT , KANNAN KRISHNAMURTHI , BURKET THOMAS GERARD , KRUESI DEBORAH JEAN , BRAUDAWAY GORDON WESLEY
Abstract: Automatic detection of and recovery from errors of transmissions in the form of a sequence of data packets is described as well as an improved combination of end-of-text (ETX) bytes along with checksums in each data packet to detect errors. The ETX character (12) is dynamically selected for each packet after the data comprising the packet has been assembled. This character is coded differently from the remaining character codes in its respective packet and is made the second byte thereof following the start-of-text byte (STX). The third byte (3) in each packet is made the complement of the preceding ETX byte, the latter of which is also made the last byte in the packet. Other bytes in each packet include: one byte (4) indicating the location of the packet in a set in a given transmission sequence; a byte (7) distinguishing the packet's set from other transmission sequences; two bytes (5,6) indicative of the number of data bytes in the packet; one byte (8) operating as a control character indicating the functional nature of the packet; data bytes; and two checksum bytes (9,10+m) which precede the last ETX byte. Upon detection of an error in a packet, the transmitter is immediately notified and retransmission is carried out only from the erroneous packet rather than from the beginning of the entire sequence as in the prior art.
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公开(公告)号：DE69331204D1
公开(公告)日：2002-01-10
申请号：DE69331204
申请日：1993-03-23
Applicant: IBM
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公开(公告)号：CA2087767A1
公开(公告)日：1993-10-16
申请号：CA2087767
申请日：1993-01-21
Applicant: IBM
Inventor： KANNAN KRISHNAMURTHI , JONES CHRISTOPHER D , LEE NATHAN J , LEONTIADES KYRIAKOS , NOVAK FRANK P , SHARMA VIKRAM
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公开(公告)号：DE3687792T2
公开(公告)日：1993-08-19
申请号：DE3687792
申请日：1986-12-18
Applicant: IBM
Inventor： MELTZER CLIFFORD BENNETT , KANNAN KRISHNAMURTHI , BURKET THOMAS GERARD , KRUESI DEBORAH JEAN , BRAUDAWAY GORDON WESLEY
Abstract: Automatic detection of and recovery from errors of transmissions in the form of a sequence of data packets is described as well as an improved combination of end-of-text (ETX) bytes along with checksums in each data packet to detect errors. The ETX character (12) is dynamically selected for each packet after the data comprising the packet has been assembled. This character is coded differently from the remaining character codes in its respective packet and is made the second byte thereof following the start-of-text byte (STX). The third byte (3) in each packet is made the complement of the preceding ETX byte, the latter of which is also made the last byte in the packet. Other bytes in each packet include: one byte (4) indicating the location of the packet in a set in a given transmission sequence; a byte (7) distinguishing the packet's set from other transmission sequences; two bytes (5,6) indicative of the number of data bytes in the packet; one byte (8) operating as a control character indicating the functional nature of the packet; data bytes; and two checksum bytes (9,10+m) which precede the last ETX byte. Upon detection of an error in a packet, the transmitter is immediately notified and retransmission is carried out only from the erroneous packet rather than from the beginning of the entire sequence as in the prior art.
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公开(公告)号：CA1301309C
公开(公告)日：1992-05-19
申请号：CA524577
申请日：1986-12-04
Applicant: IBM
Inventor： MELTZER CLIFFORD B , KANNAN KRISHNAMURTHI , BURKET THOMAS G , KRUESI DEBORAH J , BRAUDAWAY GORDON W
Abstract: A system or scheme for automatic detection of and recovery from transmission errors in the asynchronous communication mode at the data link level with complete transparency at the higher levels is disclosed wherein the transmissions are in the form of a sequence of data packets, and an improved combination of end-of-text (ETX) bytes along with checksums is used in each data packet to detect errors. The ETX character is dynamically selected for each packet after the data comprising the packet has been assembled. This character is coded differently from the remaining character codes in its respective packet and is made the second byte thereof following the start-of-text byte (STX). The third byte in each packet is made the complement of the preceding ETX byte, the latter of which is also made the last byte in the packet. Thus, the second and last bytes in each packet are identical, and different from all the other bytes, and the third byte is their complement. Other bytes m each packet include: one byte indicating the location of the packet in a set in a given transmission sequence; a byte distinguishing the Y0985-005 packet's set from other transmission sequences: two bytes indicative of the number of data bytes in the packet; one byte operating as a control character indicating the functional nature of the packet; data bytes; and, two checksum bytes which precede the last ETX byte. Among the advantages of transmissions using packets containing the foregoing improved combination of bytes, is the fact that all transmission errors will be detected and upon detection of an error in a packet, the transmitter is immediately notified and retransmission is carried out only from the erroneous packet rather than from the beginning of the entire sequence as in the prior art. Y0985-005
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