Patent ID: 6218856
Filing Date: 2001-04-17
Classification: H03K

Abstract:
A routing structure for interconnecting logic cells in a programmable logic circuit, comprising:a plurality of first signal lines extending in a first direction among the logic cells;a plurality of second signal lines extending in a second direction among the logic cells, the second direction not parallel to the first direction, the first and second signal lines crossing in a plurality of function regions;in each function region, a plurality of reprogrammable active driver circuits coupled between the first signal lines and the second signal lines for selectively disconnecting the first signal lines from the second signal lines, selected ones of the reprogrammable active driver circuits having output nodes directly driving selected ones of the second signal lines; anda plurality of additional controllable active driver circuits coupled between selected ones of the first signal lines and the controllable active driver circuits for amplifying signals on the first signal lines before supplying the signals to the controllable active driver circuits.