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    • 13. 发明授权
    • Minimum latency bus interface circuit with reduced I/O pin count through
multi-mode operation
    • 最小延时总线接口电路通过多模式操作减少I / O引脚数
    • US5694614A
    • 1997-12-02
    • US848985
    • 1997-04-30
    • Brian R. Bennett
    • Brian R. Bennett
    • G06F13/42G06F13/00
    • G06F13/4217
    • A method and apparatus for interfacing multiple integrated circuit chip devices to a system bus includes higher speed portions of a circuit within a primary IC chip and lower speed portions of a circuit within a secondary IC chip. The primary IC chip connects directly to the system bus while the secondary IC chip receives the same bus signals via the primary IC chip after a one clock cycle delay. Both the primary and secondary IC chips are capable of driving signals out onto the system bus when the primary and secondary ICs are part of a bus master circuit. When the primary and secondary ICs act as bus masters, signals are received by the secondary IC chip in the same clock cycle as the primary IC chip receives the signals. Thus, the secondary IC includes a state machine to indicate if the received signals are delayed by one clock cycle or not. In a preferred embodiment, the same pins are used by the primary IC to drive signals through to the secondary IC as to drive signals out onto the system bus.
    • 用于将多个集成电路芯片器件连接到系统总线的方法和装置包括初级IC芯片内的电路的较高速度部分和次级IC芯片内的电路的较低速度部分。 主IC芯片直接连接到系统总线,而辅助IC芯片在一个时钟周期延迟后通过主IC芯片接收相同的总线信号。 当主和次级IC都是总线主电路的一部分时,主IC芯片和辅助IC芯片能够将信号驱动到系统总线上。 当主集成电路和次级IC作为总线主机时,辅助IC芯片在与主IC芯片接收信号相同的时钟周期中接收信号。 因此,次级IC包括用于指示接收到的信号是否延迟一个时钟周期的状态机。 在优选实施例中,主IC使用相同的引脚来驱动信号通过次级IC,以将信号驱动到系统总线上。
    • 18. 发明授权
    • Multiprocessor system bus protocol for optimized accessing of
interleaved storage modules
    • 多处理器系统总线协议,用于优化访问交错存储模块
    • US5590299A
    • 1996-12-31
    • US331290
    • 1994-10-28
    • Brian R. Bennett
    • Brian R. Bennett
    • G06F12/02G06F12/06G06F13/18G06F12/00
    • G06F13/18G06F12/0607G06F12/0215
    • A multiprocessor information processing system has a system bus with interleaved memory modules in communication with multiple CPUs. The multiprocessor system includes a subsystem monitoring circuit which monitors the addresses requested by the local CPU. If the local CPU addresses a memory module which is different from the last accessed memory module, then the subsystem monitoring circuit initiates a request to maintain control of the system bus. In this manner, sequential write and read operations are typically made to interleaved memory modules so that the effects of module recovery time are minimized. The subsystem monitoring circuit includes a transfer count register which indicates how many data transfer cycles can be run in succession before the local CPU has to relinquish control of the system bus. In this manner, fair arbitration is assured for other CPUs contending for control of the system bus.
    • 多处理器信息处理系统具有与多个CPU通信的交错存储器模块的系统总线。 多处理器系统包括监视本地CPU请求的地址的子系统监视电路。 如果本地CPU寻址与最后访问的存储器模块不同的存储器模块,则子系统监视电路启动一个请求以维持系统总线的控制。 以这种方式,通常对交错的存储器模块进行顺序写入和读取操作,使得模块恢复时间的影响被最小化。 子系统监视电路包括一个传输计数寄存器,指示在本地CPU必须放弃对系统总线的控制之前可以连续运行多少个数据传输周期。 以这种方式,对于竞争控制系统总线的其他CPU,可以确保公平的仲裁。