Round-Robin Apparatus and Instruction Dispatch Scheduler Employing Same For Use In Multithreading Microprocessor
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United States of America Patent
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app pub date -
Mar 23, 2009
filing date -
Feb 4, 2005
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Abandoned
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Abstract
An apparatus for selecting one of N requesters 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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