RDL Bundle Routing Structure for Limited-Layer Bump-to-Ball Layouts
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Solution Overview
Problem
Substrate designs face challenges in route planning of redistribution layers (RDL) with limited layers, leading to poor routing quality and inefficiency due to direct net-by-net routing and manual routing methods.
Innovation Solution
A method involving an electronic design automation (EDA) tool that groups nets into bundles, transforms them into bundle routes using G-cells, and generates routes connected through vias to efficiently connect bumps and balls, while optimizing for electrical and physical constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential net-by-net routing is used, then routing can be completed with limited layers, but routing quality deteriorates
Solution Approach 1:
The patent merges multiple nets into bundles and routes them collectively through G-cells, transforming individual net routing into bundle-level routing. This combining approach enables better utilization of limited layers while maintaining or improving routing quality through coordinated path planning.
Solution Approach 2:
The patent introduces G-cells as abstract routing units that operate at a higher level of abstraction than individual nets. This dimensional shift from net-by-net to bundle-by-bundle routing enables more efficient use of limited layers while achieving superior routing quality through global optimization.
2Manufacturing precision
If manual routing is used, then routing quality can be optimized, but productivity deteriorates
Solution Approach 1:
The patent implements automated routing algorithms that perform bundle grouping, G-cell path planning, and route generation without manual intervention. The system serves itself by automatically optimizing routing quality through algorithmic decision-making, eliminating the need for manual routing while maintaining high productivity.
Solution Approach 2:
The patent changes the routing parameters from individual net characteristics to bundle-level properties, enabling automated algorithms to optimize routing quality efficiently. By transforming the problem space to operate on bundles rather than individual nets, the system achieves both high automation and routing quality.
3Device complexity
If direct net-by-net routing is used, then routing process is simple, but routing quality deteriorates
Solution Approach 1:
The patent segments the routing process into distinct phases: bundle formation, G-cell path planning, and detailed route generation within G-cells. This segmentation transforms the simple but ineffective direct routing into a multi-stage process that maintains simplicity at each stage while achieving superior overall routing quality.
Solution Approach 2:
The patent introduces G-cells as intermediary routing units between bundles and individual net routes. These G-cells serve as mediators that coordinate the paths of multiple nets within a bundle, enabling quality optimization through structured intermediate planning without excessive overall complexity.
Data Source
AI summary
A structure includes at least one ball, at least one bump and at least one route. The at least one route is configured to couple the at least one ball to the at least one bump. The at least one route comprises a plurality of first route edges and a plurality of second route edges, and an angle between one of plurality of first route edges and one of plurality of second route edges is approximately equal to an angle between another one of plurality of first route edges and another one of plurality of second route edges.