Large-capacity content addressable memory

Details Large-capacity content addressable memory Large-capacity content addressable memory

1996-11-14

1998-10-27

Hoang, Huan

Static information storage and retrieval

Associative memories

Ferroelectric cell

36518907, 365233, 365239, G11C 1500

Patent

active

058285938

ABSTRACT:
A large-capacity CAM (content addressable memory) is disclosed. RAM core cells are used to store the CAM data. The comparison function is not performed in the core cells, but rather in comparators which are placed adjacent to a plurality of core cells, in such a way that the plurality of core cells shares access to a single comparator. Access to the comparator is shared by a time-division multiplexed means, requiring a plurality of serialized operations. These operations are self-timed and transparent to the user, because they occur in a single cycle of the externally-supplied clock.

REFERENCES:
patent: 5319762 (1994-06-01), Mayer
patent: 5513134 (1996-04-01), Cooperman et al.
patent: 5568416 (1996-10-01), Kawana et al.
IEEE Journal of Solid-State Circuits, vol. 25, No. 5, Oct. 1990, pp. 1158-1165, entitled "A 1.2-Million Transistor, 33-Mhz, 20-b Dictionary Search Processor (DISP) ULSI with a 160-kb CAM" by M. Motomura, et al.
Journal of VLSI Signal Processing, vol. 4, No. 1, pp. 37-51 (1992) entitled "A Four Megabit Dynamic Systolic Associative Memory Chip" by G.J. Lipovski.
IEEE Micro, pp. 20-30, Jun. 1992, entitled "Pattern-Addressable Memory" by Ian N. Robinson.
Integration, the VLSI Journal, vol. 18, (1995) pp. 151-171, entitled "Architectures for Large-Capacity CAMs" by Kenneth J. Schultz and P. Glenn Gulak.

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