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Effective Wire Models for X-Architecture Placement

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3 Author(s)
Tung-Chieh Chen ; Nat. Taiwan Univ., Taipei ; Yi-Lin Chuang ; Yao-Wen Chang

In this paper, we derive the X-half-perimeter wirelength (XHPWL) model for X-architecture placement and explore the effects of three different wire models on X-architecture placement, including the Manhattan-half-perimeter wirelength (MHPWL) model, the XHPWL model, and the X-Steiner wirelength (XStWL) model. For min-cut partitioning placement, we apply the XHPWL and XStWL models to the generalized net-weighting method that can exactly model the wirelength after partitioning by net weighting. For analytical placement, we smooth the XHPWL function using log-sum-exp functions to facilitate analytical placement. This paper shows that both the XHPWL and XStWL models can reduce the X wirelength effectively. In particular, our results reveal the effectiveness of the X architecture on wirelength reduction during placement and, thus, the importance of the study on the X-placement algorithms, which is different from the results given in the work of Ono et al. which suggests that the X-architecture placement might not improve the X-routing wirelength over the Manhattan-architecture placement.

Published in:

Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:27 ,  Issue: 4 )

Date of Publication:

April 2008

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