改进性能驱动路由的表查找方法

J. Lillis, Premal Buch
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引用次数: 17

摘要

Elmore延迟用于互连延迟估计的不准确性是有据可查的。然而,它仍然是一种流行的延迟度量,以驱动性能优化过程,如导线尺寸和拓扑结构。本文研究了在优化过程中引入“优于elmore”延迟措施的优点。所提出的延迟度量使用表查找方法,以结合更好的负载建模和近似信号转换的影响。我们证明了所提出的度量表现出比Elmore延迟更窄的误差分布,消除了Elmore频繁的总延迟高估。最后,我们展示了通过将新的度量纳入时序驱动的拓扑构造算法可以提高解的质量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Table-lookup methods for improved performance-driven routing
The inaccuracy of Elmore delay for interconnect delay estimation is well-documented. However it remains a popular delay measure to drive performance optimization procedures such as wire-sizing and topology construction. This paper studies the merits of incorporating "better-than-Elmore" delay measures into the optimization process. The proposed delay metrics use a table-lookup method to incorporate better load modeling and approximate the effect of signal slew. We demonstrate that the proposed metrics exhibit a much narrower error distribution than Elmore delay, eliminating Elmore's frequent gross delay over-estimation. Finally we show the improvement in solution quality which can be had by incorporating the new metrics into a timing driven topology construction algorithm.
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