This paper compares the methodologies and results of three different approaches to achieving timing convergence between synthesis and place and route. First, we describe the traditional method of using synthesis and place and route tools individually while using either pessimistic wire loads or pessimistic constraints. Second, we describe the use of incremental optimization/implementation capabilities of front end and back end tools to achieve timing convergence. Last, we describe the use of timing driven place and route and place-ment-based optimization tools to achieve timing convergence.
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