| 摘要 |
A method of identifying a target data packet from a series of data packets being received or transmitted by a communications device, each data packet having a series of data values. The method having the steps of establishing a condition for the target data packet, the condition having a particular data position value and an associated particular data value; storing the particular data position value in a first content addressable memory, the first content addressable memory receiving a value related to a data position of a data value and the first content addressable memory generating a position match indicator; storing the particular data value in a second content addressable memory, the second content addressable memory receiving the data value and the second content addressable memory generating the data value match indicator; comparing the position match indicator and the data value match indicator to determine if the condition for the target data packet has been satisfied by the transmitted data value. Also discussed are various embodiments of port filter devices to implement the method.
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