Abstract: A hybrid clock distribution system uses a distribution fabric to distribute clock signals across longer physical distances and local sub-distribution networks to distribute clock signals more locally and to implement logic functions such as clock gating. A set of tap drivers connect the distribution fabric to the sub-distribution networks. A design tool automatically generates and places the set of tap drivers.

Abstract: A hybrid clock distribution system uses a distribution fabric to distribute clock signals across longer physical distances and local sub-distribution networks to distribute clock signals more locally and to implement logic functions such as clock gating. A set of tap drivers connect the distribution fabric to the sub-distribution networks. A design tool automatically generates and places the set of tap drivers.

Abstract: A tightloop method of timing driven placement. The present invention interleaves timing analyses and updates net weight based on the timing analyses as part of the cell location refinement processes of a placement algorithm. Thereby, the placement algorithm is augmented to factor in timing information such that the final placement is effective from overlap, net length, and timing perspectives.

Abstract: A method and system for high speed detailed placement of cells within an integrated circuit design. The novel detailed placement system receives a set of cells of an integrated circuit design where the cells have undergone coarse placement. Cells have variable width but the same height (or vice-versa). The cells are each assigned an initial coordinate position, e.g., using floating point precision values. During detailed placement, the cell coordinates are assigned to x-axis and y-axis grid lines. The detailed placement process sorts the cells based on their coordinates along a first axis, e.g., their x-axis coordinates; sort order dictates cell placement order. In one embodiment, sort order preference is given to the wider cells. For a given cell, placement is performed by scanning through the rows of the substrate and selecting the left-most positioned vacant site of each row as a candidate site for placement. A site is vacant if it does not contain a previously placed cell.