1. Routing circuitry in an integrated circuit comprising: a vertical channel having a first plurality of routing lines; a horizontal channel having a second plurality of routing lines; a first logic region having a first plurality of logic elements; a second logic region adjacent to the first logic region having a second plurality of logic elements; and a single level selection circuit switch array coupled to the vertical channel, to the horizontal channel, to inputs of the first plurality of logic elements, and to outputs of the second plurality of logic elements through routing lines other than the routing lines of the first and second pluralities of routing lines.