Semiconductor Data Pad Layout for Stacked Memory Interconnects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current semiconductor die stacking technologies face challenges in efficiently enabling independent communication channels between stacked memory arrays, leading to interference and complexity in data transmission due to the lack of effective layouts for data pads and dummy data pads.
Innovation Solution
The proposed solution involves a specific layout arrangement of data pads, dummy data pads, and common data pads on semiconductor dies that allows for the stacking of identical or mirror-symmetric dies in various orientations, enabling straight inter-die connections without lateral-connection portions, which reduces parasitic capacitance and simplifies manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data pads are arranged in conventional layouts on semiconductor dies, then manufacturing is simpler, but independent communication channels between stacked memory arrays cannot be established, leading to interference and complexity in data transmission
Solution Approach 1:
The data pad layout is segmented into four distinct quadrants on each die, with each quadrant containing data pads for a specific communication channel. This segmentation enables independent data transmission paths between stacked dies while maintaining manageable layout complexity through systematic organization.
Solution Approach 2:
The patent employs asymmetric positioning of data pads within each quadrant, where data pads for different channels are placed at non-symmetric locations relative to the die center. This asymmetric arrangement, combined with specific rotational orientations of stacked dies, ensures that data transmission paths do not interfere with each other while maintaining manufacturing feasibility.
2Object-affected harmful factors
If stacked dies use conventional data pad arrangements, then manufacturing cost is lower, but parasitic capacitance increases due to lateral-connection portions
Solution Approach 1:
The patent transitions from planar lateral connections to three-dimensional vertical connections by stacking dies in specific orientations. Data pads are positioned and oriented such that connections proceed vertically through the stack rather than laterally across the die surface, reducing parasitic capacitance while maintaining manufacturing simplicity through standardized pad geometries.
Solution Approach 2:
The patent introduces intermediate connection structures (such as through-silicon vias and interlayer conductors) that mediate between data pads on different dies. These intermediaries provide optimized connection paths that minimize parasitic capacitance while using conventional manufacturing processes.
3Loss of time
If data pads are positioned to enable straight inter-die connections, then communication timing improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent designs data pads with universal geometric characteristics and standardized dimensions that can be manufactured with conventional precision tolerances. The same pad design is used across all quadrants and dies, allowing straight inter-die connections to be achieved without requiring excessive manufacturing precision, while still optimizing communication timing.
Data Source
AI summary
Layouts for data pads on a semiconductor die are disclosed. An apparatus may include circuits, a first edge, a second edge perpendicular to the first edge, a third edge opposite the first edge, and a fourth edge opposite the second edge. The apparatus may also include data pads variously electrically coupled to the circuits. The data pads may include a data pad positioned a first distance from the first edge and a second distance from the second edge. The apparatus may also include dummy data pads electrically isolated from the circuits. The dummy data pads may include a dummy data pad positioned substantially the first distance from the first edge and substantially the second distance from the fourth edge. Associated systems and methods are also disclosed.