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Given a set of IO connections between IO buffers and bump balls in a re-distribution routing layer, an efficient router is proposed to route all the IO connections for pre-assignment RDL routing in an area-IO flip-chip design. Based on the simplification of net renumbering and the extraction of the maximal net sequence for all the IO connections, all the connections can be firstly divided into local...
Due to the infeasible pre-assignment of IO connections in a flip-chip design, all the published RDL routers cannot guarantee 100% routability for the pre-assigned IO connections. In this paper, based on two swapping processes for pin reassignment, the unroutable conditions in a flip-chip design can be eliminated. Furthermore, by using the assignment of routability-driven transfer and boundary pins,...
Given a set of IO buffers and bump balls with the capacity constraints between bump balls, an O(n2) IO assignment and RDL routing algorithm is proposed to assign all the IO connections and minimize the total wirelength with satisfying the capacity constraints and guarantee 100% routability if the capacity constraint is permitted, where n is the number of bump balls in a flip-chip design. Compared...
In this paper, based on the properties of a hexagonal array for flip-chip designs, a generalized hexagonal array, called alpha -hexagonal array, is proposed to increase the I/O density and reduce the area cost on total routing area. Furthermore, based on the angle assignment for the number of wires through any horizontal channel in alpha-hexagonal array, an efficient column-by-column escape routing...
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