Patent ID: 6433580
Filing Date: 2002-08-13
Classification: H03K

Abstract:
A programmable logic circuit comprising:a first plurality of configurable cells; a first set of routing lines configured to couple to the configurable cells of said first plurality of configurable cells through a first set of switches, wherein an output port of a configurable cell of said first plurality of configurable cells is coupled to an input port of another configurable cell of said first plurality of configurable cells through a single routing line from said first set of routing lines; a second plurality of configurable cells comprising at least the first plurality of configurable cells; a second set of routing lines configured to couple to the configurable cells of said second plurality of configurable cells through a second set of switches, wherein each routing line of said second set of routing lines is driven by at least one output port of a configurable cell, an output port of a configurable cell of said second plurality of configurable cells is coupled to an input port of another configurable cell of said second plurality of configurable cells through a single routing line from said second set of routing lines and said second set of routing lines having different spans from said first set of routing lines; and a third set of switches selectively coupling a third set of routing lines to said second set of routing lines of said second plurality of configurable cells and another second set of routing lines of a third plurality of configurable cells, a first portion of said third set of routing lines spanning at least the lengths of said second plurality and said third plurality of configurable cells in one dimension, wherein each routing line of said second sets of routing lines is driven by at least one routing line of said third set of routing lines through a single switch of said third set of switches and said third set of routing lines having different spans from said first set and said second set of routing lines.