A horizontal line of MegaLABs and/or ESBs (Embedded System Blocks) that is connected by a row FastTrack^® interconnect path in an APEX^™ 20K, APEX^™ II, or ARM^®-based Excalibur^™ device; or a horizontal line of LABs and/or EABs (Embedded Array Blocks) that is connected by a row FastTrack interconnect path in an ACEX^® 1K or FLEX 10KE device.