Mixed-Height High Speed Reduced Area Cell Library

A method for optimizing placement in a physical layout of a circuit formed using cells of different track heights, comprising:

• selecting a plurality of cells necessary to construct the circuit, wherein two or more cells in the plurality of cells have different track heights;
• forming a plurality of rows by joining the plurality of selected cells, wherein adjacent cells are joined by coupling power and ground rails of the adjacent cells at a secondary layer that is different from a primary layer that is used to connect active material;
• minimizing a distance between adjacent rows;
• re-ordering cells within one or more rows, wherein the cells within a row are re-ordered to minimize the vertical distance between adjacent rows;
• adjusting routing to compensate for re-ordered cells;
• and
• minimizing a distance between rows by compacting rows.

A method for optimizing placement in a physical layout of a circuit formed using cells of different track heights, comprising:

• selecting a plurality of cells necessary to construct the circuit, wherein two or more cells in the plurality of cells have different track heights;
• forming a plurality of rows by joining the plurality of selected cells, wherein adjacent cells are joined by coupling power and ground rails of the cells at a secondary layer that is different from a primary layer that is used to connect active material;
• vertically splitting one or more rows to form split rows to enable minimizing a distance between adjacent rows that have cells of the same track height;
• minimizing a distance between adjacent split rows that have cells of the same track height;
• re-ordering cells within one or more split rows that have cells of different track heights to form re-ordered split rows and to enable further minimization of the vertical distance between adjacent split rows;
• adjusting routing in the re-ordered split rows to compensate for re-ordered cells;
• and
• minimizing a distance between the re-ordered split rows by compacting the re-ordered split rows.