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    • 3. 发明授权
    • Arbitration methods to avoid deadlock and livelock when performing transactions across a bridge
    • 仲裁方法,以避免跨越桥梁进行交易时的僵局和活锁
    • US06202112B1
    • 2001-03-13
    • US09205351
    • 1998-12-03
    • Ashish GadagkarZohar BoginNarendra KhandekarDavid D. Lent
    • Ashish GadagkarZohar BoginNarendra KhandekarDavid D. Lent
    • G06F1342
    • G06F13/4036
    • An embodiment of the invention is directed at a bridge having an outbound pipe for buffering transaction information and data being transported from various devices to a bus. The bridge has an arbiter for granting requests associated with these devices to access the outbound pipe for transferring the transaction information and data into the pipe. The bridge generates a reject signal in response to an initial request associated with an initial transaction from a first one of the devices if the outbound pipe is unavailable to accept further transaction information or data. The bridge has response control logic for generating a retry response for the initial transaction in response to the reject signal. The bridge is able to assert a stamp signal in response to the reject signal. The arbiter in response to the stamp being asserted waits, without granting any other lower priority requests to access the outbound pipe, until a subsequent transaction from the first device makes progress.
    • 本发明的一个实施例涉及一种具有用于缓冲交易信息和从各种设备传输到总线的数据的出站管的桥。 桥接器具有用于授予与这些设备相关联的请求的仲裁器以访问出站管道,用于将事务信息和数据传送到管道中。 如果出站管道不可用于接受进一步的交易信息或数据,则桥接器响应于与来自第一设备的初始事务相关联的初始请求生成拒绝信号。 桥接器具有用于响应于拒绝信号而产生用于初始事务的重试响应的响应控制逻辑。 桥接器能够响应于拒绝信号来声明印记信号。 响应于该邮票被断言的仲裁者等待,而不允许任何其他较低优先级的请求访问出站管道,直到来自第一个设备的后续事务进行。