Static information storage and retrieval – Associative memories – Ferroelectric cell
Patent
1990-11-19
1993-07-06
LaRoche, Eugene R.
Static information storage and retrieval
Associative memories
Ferroelectric cell
36518907, 36523005, G11C 1500
Patent
active
052260054
ABSTRACT:
An improved CAM (content addressable memory) cell is provided with dual address lines operable independently for a Read operation or for a Write operation. The cell is additionally provided with dual ports so that the first port permits a data input for Write operations or alternatively a data input for Search-Compare operations. The second port (Data Output) is independently connected to enable Read out of data residing in the cell. Each CAM cell also has a coincidence line (match-hit) output to indicate when an input Search bit or word coincides with resident data within the CAM cell. The CAM cells are arranged in an array of "m" rows with each row having "n" bits to hold a "n" bit word. Operationally the array permits both "Read" and "Search-Compare" operations to be accomplished in one clock cycle rather than the usual requirement of 3-4 clock cycles.
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Easley Jeffery L.
Lee David C.
Malik Ashgar K.
Kozak Alfred W.
LaRoche Eugene R.
Starr Mark T.
Unisys Corporation
Yoo Do Hyun
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