摘要:
A content search circuit for determining whether an input string matches one or more of a plurality of regular expressions, the content search circuit including an instruction memory for storing a plurality of microprograms, each microprogram embodying a corresponding one of the regular expressions, a control circuit having an input to receive the input string, and having a number of outputs, and a plurality of search engines, each having a first input coupled to a corresponding output of the control circuit and having a second input coupled to the instruction memory, wherein each search engine is selectable to execute any of the microprograms stored in the instruction memory to search the input string for any of the regular expressions embodied in the microprograms.
摘要:
A network system includes a content search system for determining whether an input string matches a regular expression comprising an exact pattern and an inexact pattern, the content search system including a first search circuit dedicated to perform an exact string match operation to determine whether the input string contains a first portion that matches the exact pattern, and a second search circuit dedicated to perform an inexact string match operation to determine whether the input string contains a second portion that matches the inexact pattern.
摘要:
A network system includes a content search system for determining whether an input string matches a regular expression comprising an exact pattern and an inexact pattern, the content search system including a first search circuit dedicated to perform an exact string match operation to determine whether the input string contains a first portion that matches the exact pattern, and a second search circuit dedicated to perform an inexact string match operation to determine whether the input string contains a second portion that matches the inexact pattern.
摘要:
A content search circuit for determining whether an input string matches one or more of a plurality of regular expressions, the content search circuit including an instruction memory for storing a plurality of microprograms, each microprogram embodying a corresponding one of the regular expressions, a control circuit having an input to receive the input string, and having a number of outputs, and a plurality of search engines, each having a first input coupled to a corresponding output of the control circuit and having a second input coupled to the instruction memory, wherein each search engine is selectable to execute any of the microprograms stored in the instruction memory to search the input string for any of the regular expressions embodied in the microprograms.
摘要:
A search engine configured to determine whether an input string including a plurality of input characters matches a regular expression including an inexact pattern including a specified range of instances of pattern characters each belonging to a specified set of characters, the search engine including a microcontroller having an input to receive a microprogram embodying the inexact pattern, a first co-processor coupled to the microcontroller and dedicated to determine whether each input character in a first portion of the input string is a member of the specified set of characters, and a second co-processor coupled to the microcontroller and dedicated to determine whether the number of input characters in the first portion of the input string falls within the specified range.
摘要:
A search engine configured to determine whether an input string including a plurality of input characters matches a regular expression including an inexact pattern including a specified range of instances of pattern characters each belonging to a specified set of characters, the search engine including a microcontroller having an input to receive a microprogram embodying the inexact pattern, a first co-processor coupled to the microcontroller and dedicated to determine whether each input character in a first portion of the input string is a member of the specified set of characters, and a second co-processor coupled to the microcontroller and dedicated to determine whether the number of input characters in the first portion of the input string falls within the specified range.
摘要:
A content search system for determining whether a plurality of input strings each belonging to any one of a number of different process flows matches one or more of a plurality of regular expressions, including a search circuit for searching the input strings for the regular expressions and a data management unit including a control circuit having an input to receive the plurality of input strings, wherein each input string has an associated flow identification (ID) value, a packet queue having a number of storage locations for storing the input strings, and a flow engine that forwards a selected input string from the packet queue to the search circuit.
摘要:
A content search system for determining whether a plurality of input strings each belonging to any one of a number of different process flows matches one or more of a plurality of regular expressions, including a search circuit for searching the input strings for the regular expressions and a data management unit including a control circuit having an input to receive the plurality of input strings, wherein each input string has an associated flow identification (ID) value, a packet queue having a number of storage locations for storing the input strings, and a flow engine that forwards a selected input string from the packet queue to the search circuit.
摘要:
A content addressable memory (CAM) may include a plurality of precharge circuits, each coupled to a group of CAM cells and comprising a first precharge path that is temporarily enabled in response to an activated first control signal, and a second precharge path that is temporarily enabled in response to an activated second control signal and a valid indication that indicates whether or not the corresponding group of CAM cells stores valid data, the valid indication being different than the first and second control signals.
摘要:
A method of placing a content addressable memory (CAM) into a low current state is disclosed. The CAM can include at least one storage location that does not store valid data for a compare operation and includes a plurality of CAM cells, each CAM cell having at least two data controllable impedance paths arranged in parallel with one another. The method can include configuring the majority of the CAM cells to store data values that maintain the corresponding at least two data controllable impedance paths in high impedance states.