1. A configurable circuit in a programmable logic device (PLD), the configurable circuit comprising: a plurality of logic blocks; a first set of expanders configurably interconnecting two or more of the plurality of logic blocks, each of the first set of expanders having two or more configurable functions one of which is an AND function, the first set of expanders creating a first expander chain extending in a first direction; a second set of expanders configurably interconnecting two or more of the plurality of logic blocks, each of the second set of expanders having two or more configurable functions one of which is an AND function, the second set of expanders creating a second expander chain extending in the first direction; and a third set of expanders configurably interconnecting the first and second expander chains, each of the third set of expanders having two or more configurable functions one of which is an OR function, the third set of expanders creating a third expander chain extending in a second direction orthogonal to the first direction.