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standalone Synthesis , Placement , and Routing algorithms to an integrated construction and analysis flows for Design Closure . The challenges of rising interconnect delay led to a new way of thinking about and integrating design closure tools. New scaling challenges such as leakage power, variability, and reliability will keep on challenging the current state of the art in design closure. The RTL to GDSII flow underwent significant changes from 1980 through 2005. The continued scaling of CMOS technologies significantly changed the objectives of the various design steps. The lack of good predictors for delay has led to significant changes in recent design flows. Challenges like leakage power, variability, and reliability will continue to require significant changes to the Design Closure process in the future. Many factors describe what drove the design flow from a set of separate design steps to a fully integrated approach, and what further changes are coming to address the latest challenges. In his keynote at the 40th distinguished three periods of EDA: The Age of the Gods, The Age of the Heroes, and The Age of the Men. These eras were characterized respectively by senses, imagination, and reason. When we limit ourselves to the RTL to GDSII flow of the CAD area, we can distinguish three main eras in its development: the Age of Invention, the Age of Implementation, and the Age of Integration.
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