Current deep-submicron VLSI technology appears to cause severe crosstalk problems, since it requires adjacent wires to be placed closer and closer together. This paper deals with a horizontal layer assignment problem for three layer HVH channel routing to minimize coupling capacitance, a main source of crosstalk. It is formulated in a 0/1 integer linear programming problem which is then solved by a linear pseudo Boolean optimization technique. Experiments show that our accurate upper bound estimation technique effectively reduces crosstalk in a reasonable amount of running time.
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