| 摘要 |
When one or more storage data are coincident with single search data ( 12 ), an associative memory ( 1 ) carries out logical sum for all of storage data with a valid state for storage data as true. The result of logical sum is used as matched data logical-OR information. In a primary searching operation, the associative memory ( 1 ) is supplied with the search data ( 12 ) to provide the matched data logical-OR information on matched data logical-OR lines. Then, the associative memory ( 1 ) carries out a secondary searching operation supplied as search data with the matched data logical-OR information obtained by all of storage data coincident upon the primary searching operation. Only a match line ( 5 ) coincident with the matched data logical-OR information is selected as the secondary search result. The associative memory is used in a network router to calculate an optimum memory address signal ( 403 ) by encoding the selected match line ( 5 ). In response to the memory address signal ( 403 ), a memory data signal ( 405 ) enabling shortest network connection is produced as a transfer network address ( 413 ). The transfer network address ( 413 ) is combined with a data area ( 412 ) and a destination network address ( 411 ) contained in input transfer data ( 408 ) to produce output transfer data ( 409 ).
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