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Barrel-incrementer-based round-robin apparatus and instruction dispatch scheduler employing same for use in multithreading microprocessor
Barrel-incrementer-based round-robin apparatus and instruction dispatch scheduler employing same for use in multithreading microprocessor
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机译:基于桶增量器的循环设备和使用该设备的指令调度调度器,用于多线程微处理器
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摘要
An apparatus for selecting one of N requestors of a shared resource in a round-robin fashion is disclosed. One or more of the N requestors may be disabled from being selected in a selection cycle. The apparatus includes a first input that receives a first value specifying which of the N requestors was last selected. A second input receives a second value specifying which of the N requestors is enabled to be selected. A barrel incrementer, coupled to receive the first and second inputs, 1-bit left-rotatively increments the second value by the first value to generate a sum. Combinational logic, coupled to the barrel incrementer, generates a third value specifying which of the N requestors is selected next.
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