On the characterization of stand cell library

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There are often several cell libraries per semi process that typically
contain 100 to 1,000 cells

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STA operates independently of characterization reading both a Verilog netlist and multiple timing
libraries in Liberty format

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Accuracy to silicon over the required power supply voltage, load
range, input signal slope range

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Timing analysis and design optimization information, such as the parameters for pin-to-pin timing relationships, delay calculations, and timing constraints for sequential cells.

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When calculating total delay, the digital tool scales each parameter of Dtotal individually.

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The slope delay of an element (DS) is the incremental time delay caused by slowly changing
input signals. This is not used by AccuCell

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Timing arcs can be delay arcs or constraint arcs

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A combinational timing arc describes the timing characteristics of a combinational element

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Transition time is the time it takes for an output signal to make a transition between the high and low logic states.

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