| 摘要 |
<p>A digital system has a resource, such as a communication bus (28), adapted for a access by a plurality of devices, a plurality of devices (0-15) adapted to access the resource, and an arbitrator (27) for arbitrating access to the resource by the devices. The arbitrator includes programmable means (24) for designating order of priority of the devices for accessing the resource, which means are reprogrammable to change the order. The means are further adapted to periodically redetermine the designated priority order in a specified manner, which manner can be changed by reprogramming the means. The priority determining manner may include a constant decreasing priority, a round-robin priority, or a combination of the two. Selecting means (70) responsive to the requesting devices and to the priority designating means select the highest priority requesting device for access to the resource, and access granting means (69) grant to the selected device access to the resource. </p> |
