Method and apparatus for indicating a duplication of entries in

Details Method and apparatus for indicating a duplication of entries in Method and apparatus for indicating a duplication of entries in

1991-03-01

1993-06-15

LaRoche, Eugene R.

Static information storage and retrieval

Associative memories

Ferroelectric cell

365 51, G11C 1500

Patent

active

052205266

ABSTRACT:
An apparatus (10) indicates a duplication of information stored in a content addressable memory (CAM 12) system at the time the information is written to the system. In the CAM system, Match line signals (Match 0-Match (N-1) are asserted when information being written to a predetermined row is identical to information previously stored in the system. However, the Match line signal associated with the predetermined row is disabled by a predetermined transistor (14, 16, 18, 20) when the row is written. Because information is simultaneously presented in parallel to other rows in the CAM system, a Match line signal is asserted if the information currently written to the predetermined row is identical to information previously written to another row in the CAM system. Any asserted Match line signal which was not disabled indicates to the user of the CAM system that two or more entries are identical in the CAM array.

REFERENCES:
patent: 4296475 (1981-10-01), Nederlof
patent: 4622653 (1986-11-01), McElroy
patent: 4755974 (1988-07-01), Yamada
patent: 4791606 (1988-12-01), Threewitt
patent: 4965767 (1990-10-01), Kinoshita
patent: 5111427 (1992-05-01), Kobayashi
patent: 5130947 (1992-07-01), Reed

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