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    • 2. 发明授权
    • Using intelligent bus bridges with pico-code to service interrupts and
improve interrupt response
    • 使用带微微码的智能总线桥服务中断并改善中断响应
    • US5953535A
    • 1999-09-14
    • US826032
    • 1997-03-28
    • Brad Louis Brech
    • Brad Louis Brech
    • G06F13/24G06F9/46G06F13/36G06F13/40
    • G06F13/4027
    • A computer system having an improved method of handling interrupts associated with I/O operations to reduce interrupt latencies. The computer system includes one or more processing units, a memory device (e.g., RAM) connected to the processing unit via a system bus, and a plurality of I/O devices providing interrupt sources, connected to the processor via an I/O bus and a bus bridge. The bus bridge has incorporated therein or connected thereto means for intercepting interrupt requests transmitted to the processing unit and handling the interrupt requests without suspending the current process in the processing unit. In the preferred embodiment, the means for intercepting and handling the interrupts includes a storage device or array having pico-code instructions which are scheduled for execution in a sequencer by the interrupt control logic. If the pico-code sees an interrupt that it is not programmed to handle (such as an exception), it can pass that interrupt to the appropriate processing unit for handling. Additional bus bridges having pico-code instructions can be provided for multi-bus systems having additional interrupt sources connected via other busses.
    • 一种具有处理与I / O操作相关联的中断的改进方法以减少中断延迟的计算机系统。 计算机系统包括一个或多个处理单元,经由系统总线连接到处理单元的存储器件(例如,RAM)以及提供中断源的多个I / O设备,经由I / O总线连接到处理器 和一座公共汽车桥。 总线桥已经并入其中或与其连接,用于拦截发送到处理单元的中断请求并处理中断请求而不将当前进程挂起在处理单元中。 在优选实施例中,用于截取和处理中断的装置包括具有微调码指令的存储装置或阵列,其被安排为由中断控制逻辑在定序器中执行。 如果微微代码看到一个未被编程处理的中断(例如异常),则可以将该中断传递给适当的处理单元进行处理。 可以为具有通过其它总线连接的附加中断源的多总线系统提供具有微码指令的附加总线桥。
    • 3. 发明授权
    • Method and apparatus for processing programmed input/output (PIO)
operations in a computer system
    • 用于在计算机系统中处理编程输入/输出(PIO)操作的方法和装置
    • US5790887A
    • 1998-08-04
    • US601681
    • 1996-02-15
    • Brad Louis Brech
    • Brad Louis Brech
    • G06F13/12G06F9/28
    • G06F13/126
    • A method and apparatus are provided for processing programmed input/output (PIO) operations in a computer system. A batched list of PIO operations is stored in a buffer. Then the batched list of PIO operations is moved as a single system bus operation to an I/O bus interface unit. The I/O bus interface unit includes sequencer logic. The sequencer logic is used for executing the batched list of PIO operations and for providing an ordered sequence of PIO operations to a system I/O bus. The method and apparatus of the invention enhances the use of non-intelligent I/O adapters in a computer system by reducing the overhead of system PIO operations. Also the correctly ordered sequence of PIO commands provided by the sequencer logic facilitates the use of non-intelligent I/O adapters in reduced instruction-set computer (RISC) systems.
    • 提供了一种用于在计算机系统中处理编程输入/输出(PIO)操作的方法和装置。 PIO操作的批量列表存储在缓冲区中。 然后将批量列表的PIO操作作为单个系统总线操作移动到I / O总线接口单元。 I / O总线接口单元包括定序器逻辑。 定序器逻辑用于执行PIO操作的批量列表,并向系统I / O总线提供PIO操作的有序序列。 本发明的方法和装置通过减少系统PIO操作的开销来增强计算机系统中非智能I / O适配器的使用。 此外,定序器逻辑提供的正确排序的PIO命令序列有助于在精简指令集计算机(RISC)系统中使用非智能I / O适配器。