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    • 3. 发明授权
    • Apparatus for tracing activity on a bus of an in-circuit emulator
    • 用于跟踪在线仿真器总线上的活动的装置
    • US5513338A
    • 1996-04-30
    • US30801
    • 1993-03-12
    • James W. AlexanderTerri A. DanowskiStephen J. PetersRonald J. Whitsel
    • James W. AlexanderTerri A. DanowskiStephen J. PetersRonald J. Whitsel
    • G06F11/36G06F11/00G06F13/00
    • G06F11/364G06F11/3632
    • An in-circuit emulator trace bus clocking mechanism. A synchronization clock associated with the trace bus is provided. Arrival of a first event on a microprocessor bus to be traced is signified by a transition of a control line. A start of cycle event is detected. A start of cycle signal is generated with respect to the start of cycle event. A two stage pipeline having stage 1 storage elements and stage 2 storage elements are connected to receive data from the microprocessor bus. The start of cycle signal is used to sample data from the microprocessor bus into the stage 1 storage elements. An end of cycle event is detected. An end of cycle signal is generated with reference to the end of cycle event. The end of cycle signal is used to sample data from the stage 1 storage elements into the stage 2 storage elements. The end of cycle signal is also used to sample data appearing on the microprocessor bus at the end of the cycle into the stage 2 storage elements. The synchronization clock is combined with the end of cycle signal to generate a trace bus valid signal.
    • 在线仿真器跟踪总线时钟机制。 提供与跟踪总线相关联的同步时钟。 要跟踪的微处理器总线上的第一个事件的到达是通过控制线的转换来表示的。 检测到循环事件的开始。 相对于循环事件的开始产生循环信号的开始。 连接具有第一级存储元件和第二级存储元件的两级流水线,以从微处理器总线接收数据。 循环信号的启动用于将数据从微处理器总线采样到第1级存储单元中。 检测到循环事件的结束。 参考周期事件的结束生成周期信号的结束。 周期信号的结束被用于从第1级存储元件将数据采样到第2级存储元件中。 循环信号的结束也用于将循环结束时出现在微处理器总线上的数据采样到第2级存储单元中。 同步时钟与周期信号的结束相结合,生成跟踪总线有效信号。