Discussion
Which bus arbitration technique gives the highest priority to the device closest to the processor ?
Answer: A
The technique is daisy chaining.
In daisy chaining the bus-grant line runs through the devices one after another. The grant reaches the device nearest the processor first, and if that device is requesting it keeps the grant and does not pass it on. Priority is therefore fixed by physical position, with the closest device highest.
In polling the controller asks each device in turn, and the order can be changed in software. With independent requesting each device has its own request and grant lines, and priority is decided by the arbiter. A time-slice method shares the bus in turns rather than by position.
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