Standard Cell Metal Segments Extending Beyond Boundary

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Solution Overview

Problem

Conventional standard cell designs for integrated circuits face inefficiencies due to rigid design rules regarding metal segment termination and spacing, limiting flexibility and pin access to higher metal layers.

Innovation Solution

The introduction of tip exclusion zones allows metal segments to terminate at a minimum distance from or extend beyond the cell boundary, ensuring compliance with design rules while enabling M1 routing and increased pin access to higher metal layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If metal segments are required to terminate at the cell boundary to simplify design, then manufacturing compliance is improved, but routing flexibility and pin access to higher metal layers deteriorate

Engineering Contradiction:

Improvedesign rule complianceVSAvoidrouting flexibility

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent divides the cell boundary region into two distinct zones: a tip exclusion zone where metal segment tips cannot terminate, and a tip acceptance zone where tips can terminate. This segmentation allows different portions of the cell boundary to have different design rule requirements, enabling both manufacturing compliance and routing flexibility to coexist.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different design rules to different local regions of the cell boundary. The tip exclusion zone enforces strict termination rules to ensure manufacturing compliance, while the tip acceptance zone allows flexible termination to improve routing flexibility and pin access. This local differentiation resolves the contradiction by allowing each zone to optimize for its specific purpose.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If metal segments are extended beyond cell boundary to improve pin access, then pin access to higher metal layers is improved, but design rule complexity and manufacturing difficulty increase

Engineering Contradiction:

Improvepin accessVSAvoidmanufacturing compliance

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent segments the cell boundary into tip exclusion and tip acceptance zones, allowing metal segment tips to extend into the tip acceptance zone of adjacent cells to improve pin access to higher metal layers, while preventing termination in the tip exclusion zone to maintain manufacturing compliance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent resolves the contradiction by transitioning from a one-dimensional boundary line to a two-dimensional boundary region with distinct zones. This dimensional expansion allows the design to simultaneously satisfy manufacturing requirements (by preventing tip termination in the exclusion zone) and pin access requirements (by allowing tip extension into the acceptance zone).

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Manufacturing precision

If rigid design rules are enforced for metal segment termination, then manufacturing precision is improved, but design flexibility and routing resources deteriorate

Engineering Contradiction:

Improvetermination precisionVSAvoiddesign flexibility

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent segments the cell boundary into tip exclusion and tip acceptance zones, allowing rigid termination rules to be enforced in the tip exclusion zone for manufacturing precision, while providing flexible termination options in the tip acceptance zone to maintain design flexibility and routing resources.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different design rule strictness to different local regions: the tip exclusion zone enforces precise termination rules to ensure manufacturing precision, while the tip acceptance zone allows flexible termination to preserve design flexibility. This local quality differentiation resolves the contradiction between manufacturing precision and design flexibility.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9977854B2Integrated circuit implementing standard cells with metal layer segments extending out of cell boundary

Publication Date: 2018.05.22 ADVANCED MICRO DEVICES INC

AI summary

A computer-implemented method of fabricating an integrated circuit structure includes selecting a first cell from a standard cell library, the first cell having a cell boundary and comprising a metal segment at a first metal track at a metal layer, the metal segment extending along a direction and terminating a specified distance beyond a first edge of the cell boundary. The method further includes placing the first cell at a first location of a physical layout for the integrated circuit structure. The method also includes selecting a second cell from the standard cell library and placing the second cell at a second location of the physical layout such that a second edge of a cell boundary of the second cell abuts the first edge of the cell boundary of the first cell, and wherein the metal segment extends into a metal track at the metal layer of the second cell.