Dummy Boundary Cell Layout for Flexible IC Cell Integration

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Solution Overview

Problem

The integration of functional cells in integrated circuits is complicated by varying boundary shapes and stringent design rules, which can lead to complex layout arrangements and inefficient use of space.

Innovation Solution

The use of dummy boundary cells with predetermined structures, such as DFBC1 and DFBC2, which are placed around functional cells to form a ring, simplifying the integration process and allowing for efficient sharing of cells between adjacent functional cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If varied boundary shapes of functional cells are used to meet functional specifications, then design flexibility is improved, but space utilization deteriorates and verification time increases

Engineering Contradiction:

Improvedesign flexibilityVSAvoidspace utilization

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent applies homogeneity by standardizing boundary representations using uniform dummy boundary cells with predetermined structures. Instead of handling varied functional cell boundaries directly, the system creates a homogeneous ring of standardized dummy cells around each functional cell, enabling consistent processing and improved space utilization while maintaining design flexibility.

Inventive Principle:

Principle #33Homogeneity

Solution Approach 2:

The patent segments the boundary representation into standardized dummy boundary cells (DFBC1, DFBC2 types) that form rings around functional cells. This segmentation allows the complex varied boundaries to be broken down into manageable, reusable standardized units that can be efficiently processed and shared between adjacent cells.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If varied boundary shapes of functional cells are used to meet functional specifications, then design flexibility is improved, but verification time increases

Engineering Contradiction:

Improvedesign flexibilityVSAvoidverification time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent uses copying by creating reusable dummy boundary cell templates (DFBC1, DFBC2) that can be replicated and shared between adjacent functional cells. Instead of verifying each unique boundary shape individually, the system verifies the standardized dummy cell designs once and reuses the verification results across multiple instances, significantly reducing verification time while preserving design flexibility.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent applies preliminary action by pre-defining standardized dummy boundary cell structures with predetermined characteristics before the actual design integration. These pre-characterized cells have their design rule compliance verified in advance, so during integration, the system only needs to place and connect them rather than verify each boundary from scratch, reducing overall verification time.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If dummy boundary cells with predetermined structures are used, then integration process is simplified, but cell placement flexibility is constrained

Engineering Contradiction:

Improveintegration processVSAvoidcell placement flexibility

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent applies universality by designing dummy boundary cells that serve multiple functions: they standardize boundary representation, provide design rule compliance, enable sharing between adjacent cells, and maintain placement flexibility. The two types (DFBC1, DFBC2) can be selectively used based on orientation and adjacency requirements, making the system universally applicable to various functional cell configurations while simplifying the integration process.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12265774B2Boundary cell

Publication Date: 2025.04.01 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

Boundary cells may be provided. A boundary of a first functional cell of a circuit is determined. A first plurality of a first type of dummy cells are placed along a first portion of the determined boundary. The first portion extends in a first direction. Each of the first type of dummy cells comprises first pre-defined dimensions. A second plurality of a second type of dummy cells are placed along a second portion of the determined boundary. The second portion extends in a second direction. Each of the second type of dummy cells comprises second pre-defined dimensions. The second pre-defined dimensions is different than the first pre-defined dimensions.