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Digital storage

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  • Electrical and electronic engineering [3]
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Associative memory integrated circuit based on neural mutual inhibition
Author(s): S.M.S. Jalaleddine, L.G. Johnson
Source: IEE Proceedings G (Circuits, Devices and Systems), Volume 139, Issue 4, 1992 , p. 445 - 449
Type: Article
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Hardware associative or content-addressable memory (CAM) which finds in one operation the nearest match to input data among several templates is very crucial in the design of effective pattern recognition systems. We call this type of memory a relaxative CAM (RCAM) as opposed to the traditional exact-match CAM design. A compact implementation of an RCAM calls for the employment of a neural network model. In the paper we present the design and silicon implementation of an RCAM using a neural mutual inhibition network as the relaxation circuit. Spice simulations of the mutual inhibition and the RCAM performance are presented. A 16-word 12-bit IC has been fabricated through MOSIS using 2 μm double-metal CMOS technology. The RCAM chip was tested and its correct functionality has been fully verified.

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MOS implementation of winner-take-all network with application to content-addressable memory
Author(s): L.G. Johnson, S.M.S. Jalaleddine
Source: Electronics Letters, Volume 27, Issue 11, May 1991, p. 957 - 958
Type: Article
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Implementation of a winner-take-all (WTA) network suitable for implementing a nearest-match content-addressable memory (CAM) is presented. The resolution of the network in differentiating between words with large bit mismatches is presented. A measure of the time performance of the network is also given. A fully functional 16 word by 12 bit chip has been fabricated through MOSIS using 2 μm double-metal CMOS technology.

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Capacitive-access CAM cell and its read/write circuit implementation
Author(s): S.M.S. Jalaleddine, L.G. Johnson
Source: Electronics Letters, Volume 27, Issue 10, May 1991, p. 876 - 878
Type: Article
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The implementation of a capacitive-access CAM cell along with its read/write circuitry are presented. Its advantages over a standard CAM cell are: feasibility of implementing multicell write operation, ready availability of masking of individual bits of a word for the write operation, and a higher order of cell data stability. A fully functional chip has been fabricated through MOSIS using 2 μm double-metal CMOS technology.

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