| 摘要 |
Systems and methods for cell-based wrapped wave front arbiter (WFFA) with bandwidth reservation are disclosed. The method for reserving bandwidth of a given priority using the WWFA for arbitrating bandwidth among virtual links between input and output ports, each link supporting priorities and corresponding to an arbitration unit (AU) of the WWFA generally includes performing at least one arbitration pass of a wave front of the WWFA where AUs having a reserved bandwidth request of a given priority and reserved bandwidth credit of the given priority compete for the bandwidth associated with the wave front, and where AUs not having a reserved bandwidth request of the given priority and reserved bandwidth credit of the given priority do not compete for the bandwidth, and performing at least one subsequent arbitration pass where AUs having a reserved bandwidth request of the given priority compete for the bandwidth. Each virtual link perferably supports a high priority and a low priority such that the WWFA performs four passes. Each priority of each virtual link may be associated with a bandwidth credit accumulator register indicating the level of remaining reserved bandwidth credit, a reserved bandwidth weight register for programming a predetermined level of reserved bandwidth, a request counter register for tracking the number of bandwidth requests, a rate counter register that is periodically incremented to generate reserved bandwidth credits for the bandwidth credit accumulator register, and an optional burst register having a predetermined value for limiting the maximum value of the bandwidth credit accumulator register.
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