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Improved net merging method for gate matrix layout

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3 Author(s)
Shu, W. ; Coordinated Sci. Lab., Illinois Univ., Urbana, IL, USA ; Wu, M.-Y. ; Kang, S.M.

A net-merging method is proposed for gate-matrix layout. The method is based on a density function to calculate the minimum number of tracks necessary for the net assignment. Examples that demonstrate how this method leads to a denser gate matrix layout are included. The pitch of the gate columns is determined by the design rules, in particular, the space required to accommodate a diffused region with an internal contact window between two poly columns. In gate matrix layout, when the space between a pair of gate columns is not sufficient, the spacing between them can be increased locally to two pitches to avoid design rule violation as long as such a local change does not cause column matching problems

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:7 ,  Issue: 9 )