| 摘要 |
PURPOSE: A method and an apparatus for determining the status of a shared resource a system delays caused by synchronization are minimized, and circuit design and proof of correctness at the design stage are simplified. CONSTITUTION: A method and apparatus for determining the status of a resource(810) shared by multiple subsystems(802,804,806,808) operating in mutually asynchronous clock domains apply an one-bit counter(814,818,822,826) for each subsystem and synchronize the value of each such bit counter with all asynchronous clocks. Each subsystem exclusive-ORs the value of each bit counter(814,818,822,826) to generate an availability status for the shared resource(810).
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