Boots – shoes – and leggings
Patent
1995-05-23
1997-08-05
Teska, Kevin J.
Boots, shoes, and leggings
364490, 364578, G06F 1700
Patent
active
056551096
ABSTRACT:
Method and apparatus for automating the process of characterizing a standard cell library at multiple operating points is disclosed. In a departure from the art, a CHARS utility of the present invention sensitizes each arc of each cell of the cell library and then runs a matrix of experiments, stepping input transition times against output loads, for each sense of each arc of each cell to compute timing model timing coefficients for input to a synthesis and optimization tool such as SYNOPSYS. In a preferred embodiment, CHARS is implemented using a two pass HSPICE algorithm and each pass comprises generating a set of HSPICE decks for each sense of each arc in each cell and then running HSPICE to simulate the timing behavior of the cell. The first pass generates HSPICE decks for computing pin capacitances, input threshold voltage and the maximum load the cell can drive. The second pass uses the information generated during the first pass to do a detailed characterization analysis on the cell. For each sense of each arc in each cell, CHARS runs a matrix of experiments, stepping input transition times against output loads. The matrix of data is then analyzed to generate timing model coefficients. Setup and hold parameters for sequential cells are also computed at that time.
REFERENCES:
patent: 5249156 (1993-09-01), Hagiwara et al.
patent: 5274568 (1993-12-01), Blinne et al.
patent: 5452225 (1995-09-01), Hammer
patent: 5504694 (1996-04-01), George et al.
patent: 5519848 (1996-05-01), Wloka et al.
Advanced Micro Devices , Inc.
Loppnow Matthew
Teska Kevin J.
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