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A bus arbitration regulates access to a common bus by a plurality of devices by assigning each device a priority rank. A current weighted bandwidth of each device is set equal to a desired weighted bandwidth. A request to access the common bus is granted to the device having the highest priority ran

A bus arbitration regulates access to a common bus by a plurality of devices by assigning each device a priority rank. A current weighted bandwidth of each device is set equal to a desired weighted bandwidth. A request to access the common bus is granted to the device having the highest priority rank among a set of requesting devices. The current weighted bandwidth the first device is decremented. The priority rank of the serviced device is set equal to a lowest value if its current weighted bandwidth is equal to a minimum value. The priority rank of a set of devices which previously had a lower priority rank than the first device is increased. The current weighted bandwidth of the serviced device is set equal to the desired weighted bandwidth. After a number of bus transactions have been completed, the desired weighted bandwidth of the devices may be adjusted to based upon system performance.

대표청구항 ▼

1. A method of arbitrating access to a common bus comprising:assigning a desired weighted bandwidth to a first device which transfers data over the common bus, wherein said desired weighted bandwidth reflects selected performance abilities and requirements of said first device; assigning a desired w

1. A method of arbitrating access to a common bus comprising:assigning a desired weighted bandwidth to a first device which transfers data over the common bus, wherein said desired weighted bandwidth reflects selected performance abilities and requirements of said first device; assigning a desired weighted bandwidth to a second device which transfers data over the common bus, wherein said desired weighted bandwidth reflects selected performance abilities and requirements of said second device; arbitrating access to the common bus based upon the desired weighted bandwidths of the first and second devices; and dynamically adjusting the desired weighted bandwidths of the first and second devices during operation based upon a history of a measure of data transfer over the common bus by at least one of the first and second devices, occurring within a defined period.