Avant! Corporation

Vivek Raghavan

Brian Allan Zimmerman

A method, apparatus and computer program product performs a bounded parasitic extraction of typically all nets in an integrated circuit as part of a series of post-layout verification operations. According to one embodiment, a resistance-only extraction and/or a capacitance-only extraction is initially performed using computationally inexpensive electrical models of the nets. The resistance and capacitance extractions may be combined with models of the active devices to generate realistic worst case and best case delay models for each of the extracted nets. The delay models may be based on the resistance-only extraction and an upper bound on the parasitic capacitance of the net determined from the capacitance-only extraction, however, other models based solely on a resistance-only extraction may also be used, although they are typically less preferred. A user-specified timing error tolerance is then used to automatically determine the appropriate level of additional extraction detail to be applied to the specific nets in the integrated circuit. This gives the user direct error control over the extraction process so that the extracted netlist meets the user-specified timing error tolerance in an efficient manner.

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Durham, NC, United States of America

Vivek Raghavan