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    초록·키워드

    In this paper, we describe a flexible module generator (FMG) for transforming a given CMOS circuit netlist into an optimized symbolic layout. Contrary to other conventional module generators which place all transistors either in horizontal or in vertical direction, FMG places transistors in any multiples of 90 degrees. Our new layout style can maximize the diffusion sharing and hence can reduce the routing requirement for both of area minimization and performance improvement. In FMG, transistors are initially randomly placed and then selected transistors are iteratively replaced using an optimization technique based on simulated evolution. Whenever a transistor is replaced, the affected nets are rerouted. Constraints on the shape, aspect ratio, and critical path delays are considered during the optimization process. Routing is performed by using a modified maze router on polysilicon, metal 1, and metal 2 interconnection layers. Additional routing grids are added, if necessary, for complete routing. Unused rows or columns are removed after routing for area minimization. Experimental results show that FMG synthesizes satisfactory layouts.

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      UCI(KEPA) : I410-ECN-0101-2009-569-013193781