Apparatus for calculating delay time in logic functional blocks

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364491, 34082587, 326 16, 326 21, 326119, 327261, G06F 1500, H03K 1902

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055152910

ABSTRACT:
A delay parameter calculator (13) calculates an input slew rate (tr) as a function of a layout pattern information (D12) to determine delay parameters (K) by substituting the slew rate (tr) for a delay parameter function (K(tr)). An output impedance calculator (15) calculates an impedance (RS) of an accurate output macro cell (21) as a function of a capacitance lumped constant (C) and the delay parameters (K). A delay time calculator (16) solves an equation having the output impedance (RS) as a significant parameter to correctly calculate a delay time (DT) it takes to transmit a signal from an input to an output of a logic functional block composed of MOS transistors.

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Gate Ensemble User Guide, Release 2.0, Chapter 12.2, pp. 12-4-12-11, "Delay Modeling", No Date.

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