An intrinsic area-array pad router for ICs

Arranging I/Os in a matrix array over the core circuitry of an IC generally provides 5-10 times more I/Os than the traditional method of restricting pads to the periphery. This approach also minimizes overall die size. In this paper we describe the development of a new area-array pad router which differs from other approaches in that no additional metal layer is added (unless needed) and no redistribution is required. We describe the design implementation of this technique and show the results of applying this router on designs requiring 112, 298, 414 and 485 I/Os