Dynamic linking of banks in configurable content addressable...

Details Dynamic linking of banks in configurable content addressable... Dynamic linking of banks in configurable content addressable...

2006-05-30

2006-05-30

Bataille, Pierre-Michel (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C365S049130

Reexamination Certificate

active

07054995

ABSTRACT:
A content addressable memory (CAM) system includes CAM banks that can be linked together in a series to form a CAM module. Each CAM bank includes a CAM array with rows. In a lookup operation, each row asserts a field-match signal when a field from a key matches the field of a CAM entry held in the row. Each CAM bank receives a link-control signal, each received from the preceding CAM bank match-in signals for the rows, and each generates match-out signals for the rows. Some embodiments dynamically configure the CAM system into one or more independent CAM modules of various widths, according to data held in a configuration register or to the current value of the key or other search information. Some embodiments include multiple priority encoders that can be coupled to the match-out signals of dynamically selected CAM banks, thus advantageously allowing parallel lookup operations in the CAM modules.

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Waldvogel et al., “Scalable High-Speed Prefix Matching,” ACM Transactions on Computer Systems, vol. 19, No. 4, Nov. 2001, pp. 440-482.

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