| 摘要 |
First to fourth input buffers stores cells inputted from first to fourth input ports, respectively. Each input buffer is equipped with a main buffer section, a plurality of sub-buffer sections connected to the main buffer section in series and a buffer controller for controlling them. A collision judging section judges whether or not a collision occurs between the cells outputted from each sub-buffer section, and the judged result is sent to a cell converter. The cell converter returns a collision information to the buffer controller in accordance with the judged result, and further sends a cell, which has a victory information since it is judged as a victory over the collision, through a sorter to a self-routing section. The self-routing section outputs the received cell to an output port. This configuration enables a shuffle operation to be carried out in the sub-buffer section and the cell converter to thereby avoid the drop of the throughput.
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