| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To realize a data check by hardware which can be composed of a circuit performing a check of simple data, which can reduce the number of checks with the circuit, and which can be simply composed without table information for determining subsequent processing. <P>SOLUTION: A data analyzer is composed of Kh units of key head detection circuits A1-AKh connected in cascade, and N units of matching determination circuits B1-BN connected to the subsequent stage of the last stage of the key head detection circuit in cascade. When a data stream matching with the key data header of a length Kh within the key data of a length K exists within a checked data stream, the key head detection circuit inserts mark data "MRK" just after the data stream matching with the key data header. When the mark data "MRK" exist in the data stream of a packet inputted from the key head detection circuit, the matching determination circuit determines whether or not a data stream excepting the key data header from key data with a data stream after the mark data "MRK". <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
