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    • 14. 发明授权
    • Pipeline bit handling circuit and method for a bus bridge
    • 一种总线桥管道位处理电路及方法
    • US07275125B2
    • 2007-09-25
    • US11064744
    • 2005-02-24
    • Robert Allen DrehmelClarence Rosser OgilvieCharles S. Woodruff
    • Robert Allen DrehmelClarence Rosser OgilvieCharles S. Woodruff
    • G06F13/36G06F7/38G06F13/00
    • G06F13/4027G06F12/0831
    • A circuit and method to provide pipeline bit handling across a bus bridge between two different buses. In a preferred embodiment, the pipeline bit handling circuit provides rule enforcement for a P-bit address modifier across a bus bridge between two different buses with different rules for the P-bit address modifier. In a bus domain where pipeline transactions are allowed if the P-Bit is asserted and are not allowed if the P-Bit is not asserted, embodiments herein allow a master bus device to ensure that all bus devices will see a P=0 command with a defined minimum spacing to any other P=0 command. The required separation for P=0 commands is maintained within the bus bridge. In the preferred embodiments, the separation between P=0 commands is maintained by immediately retrying P=0 commands rather than spacing snoop requests.
    • 一种用于在两条不同总线之间的总线桥上提供流水线位处理的电路和方法。 在优选实施例中,流水线位处理电路为P位地址修改器具有不同规则的两个不同总线之间的总线桥上的P位地址修改器提供规则强制。 在一个总线域中,如果P位被断言,允许流水线事务被允许,并且如果P位未被置位则不允许流水线事务,这里的实施例允许主总线设备确保所有总线设备将看到P = 0命令, 与任何其他P = 0命令的定义的最小间距。 在总线桥内保持P = 0命令所需的间隔。 在优选实施例中,通过立即重试P = 0命令而不是间隔窥探请求来保持P = 0命令之间的间隔。