Variable field content addressable memory

Details Variable field content addressable memory Variable field content addressable memory

1987-12-10

1989-07-04

Fears, Terrell W.

Static information storage and retrieval

Associative memories

Ferroelectric cell

364200, 364900, G11C 1500

Patent

active

048456683

ABSTRACT:
A variable field content addressable memory (VFCAM) unit cell comprises a 4-bit content addressable memory, a programmer and a field selector. A limited capability of comparing between limits is provided by using mask bits at the data line inputs to the VFCAM unit cell. A plurality of VFCAM unit cells may be cascaded vertically and horizontally to provide a Y words by X bits VFCAM array. The VFCAM array is programmable by a field code coupled to field partition logic which selects the same number of fields in all memory locations and the number of bits in each field, and an operational VFCAM system results when the VFCAM array is coupled to an input address decoder, an I/O register and an output encoder.

REFERENCES:
patent: 3253265 (1966-05-01), Lindquist
patent: 3329937 (1967-07-01), Lewin
patent: 4523301 (1985-06-01), adota et al.
Preliminary Data Sheet for "VHSIC Window Addressable Memory (WAM)" by TRW Electronic Systems Group, 1986.
Hanna, Craig A., "The Associative Comparator: New Horizons in Electronic Defense", Technical Directions Federal Systems Division by IBM, vol. 9, No. 2, 1983.

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