Static information storage and retrieval – Read/write circuit – Flip-flop used for sensing
Reexamination Certificate
2007-12-11
2007-12-11
Elms, Richard T. (Department: 2824)
Static information storage and retrieval
Read/write circuit
Flip-flop used for sensing
C365S154000
Reexamination Certificate
active
10524319
ABSTRACT:
Asymmetric SRAM cell designs exploiting data storage patterns found in ordinary software programs wherein most of the bits stored are zeroes for data and instruction streams. The asymmetric SRAM cell designs offer lower leakage power with little impact on latency. In asymmetric SRAM cells, selected transistors are “weakened” to reduce leakage current when the cell is storing a zero. Transistor weakening may be achieved by using higher voltage threshold transistors, by varying transistor geometries, or other means. In addition, a novel sense amplifier design is provided that leverages the asymmetric nature of the asymmetric SRAM cells to offer cell read times that are comparable with conventional symmetric SRAM cells. Lastly, cache memory designs are provided that are based on asymmetric SRAM cells offering leakage power reduction while maintaining high performance, comparable noise margins, and stability with respect to conventional cache memories.
REFERENCES:
patent: 5144582 (1992-09-01), Steele
patent: 5355333 (1994-10-01), Pascucci
patent: 5363328 (1994-11-01), Browning, III et al.
patent: 5583821 (1996-12-01), Rose et al.
patent: 5608581 (1997-03-01), Potma
patent: 5742552 (1998-04-01), Greenberg
patent: 5744411 (1998-04-01), Zhao et al.
patent: 5949256 (1999-09-01), Zhang et al.
patent: 6188628 (2001-02-01), Tomotani
patent: 6198656 (2001-03-01), Zhang
patent: 6275433 (2001-08-01), Forbes
patent: 6317362 (2001-11-01), Nomura et al.
patent: 6425056 (2002-07-01), Meyer
patent: 6466489 (2002-10-01), Ieong et al.
patent: 6556472 (2003-04-01), Yokozeki
patent: 7158402 (2007-01-01), Houston
patent: 2001/0043486 (2001-11-01), Naffziger et al.
patent: 2003/0002328 (2003-01-01), Yamauchi
patent: 2003/0119265 (2003-06-01), Kuwazawa
Azizi Navid
Moshovos Andreas
Najm Farid N.
Elms Richard T.
King Douglas
Moore & Van Allen PLLC
Phillips Steven B.
The Governing Council of the University of Toronto
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