Routing definition to optimize layout design of standard cells
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorLi-Chun Tien
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Abstract
A novel routing rule definition for standard cells placement is disclosed. The method comprises following steps. At beginning, a statistical analysis is carried out to analyze the frequency of standard cells used in a design plane. The most frequency used types in standard cells is then used as bases for a greatest common divisor (GCD) calculation. The GCD value acquired is then as a routing pitch criterion, which is a distance of contact hole-to-contact hole, or says the standard cell width.
Claims11
A method for routing definition so as to optimize layout design comprising the steps of:
- performing standard cells used times in a design plane statistical analysis so as to acquire types of said standard cells used frequency in top two, three or, four as selected types of said standard cells;
- calculating a greatest common divisor (GCD) of said selected types of standard cells in cell width as a criterion of a routing definition;
- and
- using said GCD value as a contact pitch to performing routing and for said standard cell placement.
A method for routing definition so as to optimize layout design comprising the steps of:
- determining a greatest common divisor (GCD) of cell widths of an inverter and an NAND gate;
- and
- using said GCD as a contact hole pitch for routing bases.
A method for routing definition so as to optimize layout design comprising the steps of:
- determining a pitch of two nearest contact holes across a polygate in between;
- and
- using said pitch as a basis of routing.
Dependencies are inferred from the claim text.