Floorplan and Power/Ground Network Co-Synthesis for Multipleupply Voltage Designs
Date Issued
2008
Date
2008
Author(s)
Lee, Meng-Xiang
Abstract
With technology scaling, the voltage (IR) drop in the power/ground (P/G) network becomes a crucial problem in modern IC designs. Since traditional IR-drop analysis methods are often very time-consuming, it is not feasible to apply traditional IR-drop analysis methods to co-synthesize the P/G network and floorplans. On the other hand, multiple-supply-voltage (MSV) designs further complicate the IR-drop analysis in the P/G network. Therefore, in this thesis, we first propose an efficient, yet reasonable IR-drop model. Based on the proposed IR-drop model, we present an efficient and effective floorplanning algorithm considering the IR-drop effect and the P/G network routing resource for designs with wire-bonding packaged power networks. Specifically, a perimeter-driven floorplanner, a linear-time block-adjacency-graph constructor, and a voltage-island clustering technique areresented. After floorplanning, we develop a linear programming based algorithm to perform simultaneous power-pad placement and whitespace redistribution for the IR-drop reduction. Experimental results validate the proposed IR-drop model and show that our algorithms can significantly improve the floorplanning convergence and effectively reduce the IR-drop cost for MSV designs.
Subjects
IR Drop
Floorplanning
Voltgae Island
Type
thesis
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