Altitude-Based I/O Layer Mapping for Die Stack Alignment
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Solution Overview
Problem
Conventional IC and photonic IC package design assumptions that interface layers align only with the front or back sides of dies lead to misaligned connection points and false positives/negatives due to I/Os at non-front/back side locations, causing design errors and delays.
Innovation Solution
Implement altitude-based re-layering for I/Os, assigning them to specific die-stack layers based on their actual altitudes rather than just front or back sides, allowing N number of layers corresponding to I/O elevations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If interface layers are aligned only with front or back sides of dies, then package design is simplified, but connection points become misaligned causing design errors
Solution Approach 1:
The patent segments the interface layer alignment into multiple discrete altitude levels corresponding to different I/O locations. Instead of a single unified alignment plane, the design divides the interface into multiple stacked layers at different Z-heights, allowing each I/O group to be precisely positioned at its appropriate altitude while maintaining overall design organization.
Solution Approach 2:
The patent introduces the Z-dimension (altitude) as an additional spatial parameter for interface layer positioning. By moving from a two-dimensional planar alignment approach to a three-dimensional stacked layer approach, the design can accommodate I/Os at various heights without compromising connection precision, thus resolving the contradiction between design simplicity and alignment accuracy.
2Productivity
If interface layers are aligned only with front or back sides of dies, then design process is faster, but false positives and negatives occur in verification
Solution Approach 1:
The verification process is segmented into multiple altitude-specific checks rather than a single bulk verification. Each stacked interface layer can be independently verified for its specific altitude and connection requirements, improving measurement precision while maintaining efficient automated verification workflows through systematic layer-by-layer validation.
Solution Approach 2:
The patent applies local quality verification where each interface layer is validated according to its specific altitude and connection characteristics. Rather than applying a uniform verification standard to all interface layers, the design allows tailored verification rules for each Z-level, enhancing detection accuracy for altitude-specific misalignments while preserving overall verification efficiency.
3Device complexity
If I/Os at different elevations are associated with the same die stack layer, then layer management is simpler, but mistaken associations occur
Solution Approach 1:
The die stack layers are segmented into multiple discrete altitude levels, with each layer dedicated to I/Os at a specific Z-height. This segmentation prevents mistaken associations by ensuring that I/Os at different elevations are automatically assigned to different layers based on their altitude, thereby maintaining association accuracy while preserving systematic layer management through the stacked layer structure.
Solution Approach 2:
The patent introduces altitude-based Z-coordinates as an intermediary parameter that mediates the association between I/Os and die stack layers. This intermediary altitude reference system automatically determines layer assignment, eliminating manual association errors while maintaining clear and organized layer management through the altitude-to-layer mapping relationship.
Data Source
AI summary
Disclosed is an improved approach to implement electronic designs by performing altitude-based re-layering for I/Os. The altitude-based die stack layers allows N number of die stack layers corresponding to the actual altitudes of the I/Os in the design.