Static information storage and retrieval – Associative memories – Ferroelectric cell
Reexamination Certificate
2007-07-10
2007-07-10
Ho, Hoai V. (Department: 2827)
Static information storage and retrieval
Associative memories
Ferroelectric cell
C365S203000, C365S230030
Reexamination Certificate
active
11262062
ABSTRACT:
A CAM bank is functionally divided into two or more sub-banks, without replicating CAM driver circuits, by disabling all match line discharge circuits in the bank, and selectively enabling the discharge circuits in entries comprising sub-banks. At least one selectively actuated switching circuit is interposed between the virtual ground node of each discharging comparator in the discharge circuit of a sub-bank and circuit ground. When the switching circuit is in a non-conductive state, the virtual ground node is maintained at a voltage level sufficiently above circuit ground to preclude discharging a connected match line within the CAM access time. When the switching circuit is placed in a conductive state, the virtual ground node is pulled to circuit ground and the connected match line may be discharged by a miscompare. Control signals, which may be decoded from address bits, are distributed to the switching circuits to define the CAM sub-banks.
REFERENCES:
patent: 6700827 (2004-03-01), Lien et al.
patent: 7019999 (2006-03-01), Srinivasan et al.
patent: 7050318 (2006-05-01), Argyres
patent: 7110317 (2006-09-01), Song et al.
Bridges Jeffrey Todd
Chai Chiaming
Fischer Jeffrey Herbert
Phan Michael ThaiThanh
Ciccozzi John L.
Ho Hoai V.
Pauley Nicholas J.
QUALCOMM Incorporated
Rouse Thomas
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