Presentation
An Effective Timing Driven Placement with Accurate Differentiable Timing Approximation Integration
DescriptionTiming closure is a critical but effort-taking task in VLSI designs. In this paper, we focus on the timing-driven placement by considering two important factors, namely accurate sign-off timing predictor and accordingly placement optimization method. For accurate timing analysis, an innovative timing prediction model that can be transformed into a differentiable function is proposed, serving as a replacement for the conventional Elmore delay. While maintaining model accuracy, the overall model complexity is thereby reduced. To evaluate the effectiveness of our timing model, we seamlessly integrate it into the open-source placer DreamPlace. In addition, a pin-to-pin weighting approach based on differentiable timing model is given for timing optimization. Experimental results show that our differentiable timing prediction model can significantly reduce the max and mean timing errors compared to the Elmore delay, and exhibits equivalent accuracy to the non-differentiable timing prediction model. The timing performance after placement optimization is better than the result using Elmore delay, i.,e., smaller TNS and WNS with wirelength decreases by 15% on average.
Event Type
Work-in-Progress Poster
TimeTuesday, June 256:00pm - 7:00pm PDT
LocationLevel 2 Lobby
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