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Logical operation unit for packet processing

  • US 6,658,002 B1
  • Filed: 06/17/1999
  • Issued: 12/02/2003
  • Est. Priority Date: 06/30/1998
  • Status: Expired due to Term
First Claim
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1. An apparatus for expediting processing in a data communications device comprising:

  • an input interface circuit that reads a data packet comprising one or more readable fields;

    a logic circuit connected to said input interface circuit that performs at least one logical function of at least one of said readable fields to create a result vector; and

    a lookup interface circuit connected to said input interface circuit and said logic circuit that extracts from said result vector an auxiliary field and combines said auxiliary field with said readable fields into a lookup key;

    wherein said lookup key is used to perform a content addressable memory lookup.

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