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    • 1. 发明授权
    • Protocol for handling transmission errors over asynchronous
communication lines
    • 通过异步通信线路处理传输错误的协议
    • US4712214A
    • 1987-12-08
    • US817699
    • 1986-01-10
    • Clifford B. MeltzerKrishnamurthi KannanThomas G. BurketDeborah J. KruesiGordon W. Braudaway
    • Clifford B. MeltzerKrishnamurthi KannanThomas G. BurketDeborah J. KruesiGordon W. Braudaway
    • H04N7/173H04L1/00H04L1/16H04L29/08G06F11/10G08C25/00
    • H04L1/0083
    • 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 in each packet include: one byte indicating the location of the packet in a set in a given transmission sequence; a byte distinguishing the 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.
    • 公开了一种用于在具有完全透明度的数据链路级别的异步通信模式下自动检测和恢复传输错误的系统或方案,其中传输是数据分组序列的形式,并且改进的组合 每个数据包中使用文本结尾(ETX)字节以及校验和来检测错误。 在组合数据包的数据之后,ETX字符是为每个数据包动态选择的。 该字符与其各自的分组中的剩余字符代码不同,并且使其成为文本开头字节(STX)之后的第二个字节。 每个数据包中的第三个字节是前一个ETX字节的补码,后一个字节也是数据包中的最后一个字节。 因此,每个分组中的第二个和最后一个字节是相同的,并且与所有其他字节不同,第三个字节是它们的补码。 每个分组中的其他字节包括:指示给定传输序列中的分组中的分组的位置的一个字节; 将分组的集合与其他传输序列区分开的字节; 两个字节表示数据包中的数据字节数; 一个字节作为指示分组的功能性质的控制字符操作; 数据字节; 以及在最后一个ETX字节之前的两个校验和字节。 在使用包含上述改进的字节组合的分组的传输的优点之中,是所有的传输错误将被检测到,并且在检测到分组中的错误之后,发送器立即被通知,并且仅从错误的分组 而不是像现有技术那样从整个序列开始。
    • 3. 发明授权
    • System and method for performing a continuous multi-stage function
    • 用于执行连续多级功能的系统和方法
    • US5519870A
    • 1996-05-21
    • US469627
    • 1995-06-06
    • Krishnamurthi KannanDavid P. LybrandFrank P. Novak
    • Krishnamurthi KannanDavid P. LybrandFrank P. Novak
    • G06F9/06G06F1/00G06F9/24G06F9/445G06F3/03G06F3/033
    • G06F9/4406
    • This invention describes a set of methods and techniques that together address the deficiencies of the basic input/output system (BIOS) and the advanced basic input/output system (ABIOS) in the context of a pen-based portable computer while retaining much of its strengths in terms of providing an insulating layer between the hardware and the operating system such that the same operating system code body will execute in a variety of hardware platforms. In particular, the following deficiencies have been addressed. (a) A dual boot capability allowing the user to select, through a set-up procedure, either a conventional (DOS-style) booting procedure or a Penpoint-style booting procedure. (b) The capability to mast certain device characteristics from the operating system, defined as a callback mechanism. (c) A method for collecting and maintaining device state information of a device that could be disconnected or reconnected during the operating of the computer.
    • 本发明描述了一组方法和技术,其一起解决了基于笔的便携式计算机的上下文中基本输入/输出系统(BIOS)和高级基本输入/输出系统(ABIOS)的缺陷,同时保留了大部分 在硬件和操作系统之间提供绝缘层的优点,使得相同的操作系统代码体将在各种硬件平台中执行。 特别是,以下缺陷已得到解决。 (a)双引导功能,允许用户通过设置过程选择常规(DOS风格)启动过程或Penpoint式启动过程。 (b)能够将操作系统中的某些设备特性,定义为回调机制。 (c)用于收集和维护在计算机操作期间可能断开或重新连接的设备的设备状态信息的方法。
    • 6. 发明授权
    • System for distributed power management in portable computers
    • 便携式电脑分布式电源管理系统
    • US5511205A
    • 1996-04-23
    • US355205
    • 1994-12-08
    • Krishnamurthi KannanChristopher D. JonesNathan J. LeeKyriakos LeontiadesFrank P. NovakVikram Sharma
    • Krishnamurthi KannanChristopher D. JonesNathan J. LeeKyriakos LeontiadesFrank P. NovakVikram Sharma
    • G06F1/26G06F1/28G06F1/30G06F1/32G06F9/30
    • G06F9/30083G06F1/30G06F1/3203
    • A system and method for managing power in a portable, pen-based notebook computer. The system and method provides for minimizing power consumption by collecting and interpreting power related data of various processing elements while hiding many of the details from the end-user. The system monitors, collects, and acts upon power-related data in a portable computer to maximize the amount of time the portable computer can be used between battery re-charging with minimal user intervention. The system has 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 for monitoring battery condition, user invoked functions, and system state and power management for controlling the operation of each of the CPUs as a function of the conditions sensed.
    • 一种用于在便携式笔式笔记本电脑中管理电力的系统和方法。 该系统和方法通过收集和解释各种处理元件的功率相关数据,同时隐藏来自最终用户的许多细节来提供最小化功耗。 系统监视,收集并对便携式计算机中的电源相关数据进行操作,以最大限度地利用便携式计算机在电池重新充电之间以最少的用户干预来使用的时间。 该系统具有多个可独立控制的电力平面,其被选择性地供电,使得便携式计算机消耗执行特定功能所需的最小功率以及相对于彼此异步操作的多个中央处理单元(CPU)。 本发明还包括用于监测电池状况,用户调用功能的开/关胶逻辑,以及用于根据所感测的条件来控制每个CPU的操作的系统状态和电源管理。