| 摘要 |
PURPOSE: A bus arbitration apparatus and method is provided to reduce stand-by time of node taken to obtain use authority for bus in an information communication system where a plurality of nodes are arranged in a single board. CONSTITUTION: An apparatus comprises the first arbiter(311) for taking, as an input, bus use request signals from all nodes in a board, selecting the node where the bus use request signal is generated, and applying the bus use request signal to the selected node; and the second arbiter(321) for receiving the bus use request signal, and applying a bus use permit signal to the first arbiter. The second arbiter includes a counter(401) for performing counting operation in accordance with a bus arbitration clock signal, a comparator(402) for comparing ID value of the board and the counted value output from the counter; and a logic AND gate(403) for performing AND logic operation for the comparison result of the comparator and the bus use request signal, and outputting a bus arbitration delay signal.
|
