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Accurate estimation of global buffer delay within a floorplan

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4 Author(s)

Closed-form expressions for buffered interconnect delay approximation have been around for some time. However, previous approaches assume that buffers are free to be placed anywhere. In practice, designs frequently have large blocks that make the ideal buffer-insertion solution unrealizable. The theory of Otten (ACM/IEEE Intl. Symp. Physical Design, p. 104, 1998) is extended to show how one can model the blocks into a simple delay-estimation technique that applies to both two-pin and multipin nets. Even though the formula uses one buffer type, it shows remarkable accuracy in predicting delay when compared to an optimal realizable buffer-insertion solution. Potential applications include wire planning, timing analysis during floorplanning, or global routing. The authors' experiments show that their approach accurately predicts delay when compared to constructing a realizable buffer insertion with multiple buffer types

Published in:

Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:25 ,  Issue: 6 )

Date of Publication:

June 2006

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