Sequential Delay Budgeting with Interconnect Prediction

摘要

In this paper we describe sequential retiming with delay budgeting and interconnect lengths prediction. The quality of sequential retiming depends upon the estimated interconnect delays. We derive the interconnect delays from the average net-lengths predictions and the newly proposed mutual contraction measure. We transform the predicted net lengths into net weights and use them in our sequential budgeting. The results show that sequential retiming with the new net weighting and budgeting to estimate the net delays can improve circuit speeds by 12.29% on the average, compared to timing-driven placement. The new net weighting method is better than the uniform weighting. Retiming with estimated net delays is better than retiming at the logic level only.