Semiconductor Die Data Pad Layouts for Stacked Memory
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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 stacked dies, then manufacturing is simpler, but independent communication channels between memory arrays cannot be established due to interference
Solution Approach 1:
The pad layout is segmented into four distinct quadrants on each die, with each quadrant containing data pads for a specific memory array. This segmentation enables independent communication channels by physically separating the data paths of different memory arrays, preventing interference while maintaining clear organizational structure for manufacturing
Solution Approach 2:
The patent employs asymmetric positioning of data pads within each quadrant, where the exact location of data pads depends on the die's orientation (0°, 90°, 180°, or 270°). This asymmetric yet orientation-dependent layout allows identical dies to be stacked in different orientations while maintaining proper data channel alignment and independence
2Ease of manufacture
If inter-die connections include lateral-connection portions, then routing flexibility is improved, but parasitic capacitance increases and manufacturing complexity increases
Solution Approach 1:
The invention extracts and eliminates the lateral-connection portions from the inter-die connection structure, retaining only the vertical TSV components. This removal of unnecessary lateral segments directly reduces parasitic capacitance and simplifies the manufacturing process while maintaining adequate routing flexibility through the vertical connection paths
Solution Approach 2:
Instead of using conventional horizontal/ lateral routing approaches for inter-die connections, the invention inverts the connection strategy by utilizing purely vertical TSV paths. This inversion of the connection geometry simplifies the manufacturing alignment process and reduces the harmful lateral connection segments that contribute to parasitic capacitance
3Productivity
If multiple memory arrays are stacked without specific pad layouts, then device density is improved, but signal interference increases and communication timing deteriorates
Solution Approach 1:
Each quadrant of the pad layout is designed with specific local characteristics tailored to its associated memory array, with data pads positioned and configured according to the local requirements of each memory array. This local optimization ensures that signal integrity and communication timing are maintained for each array independently, even as device density increases through stacking
Solution Approach 2:
The invention transitions from two-dimensional pad layouts to a three-dimensional stacked architecture with orientation-dependent positioning. By utilizing the vertical stacking dimension and allowing dies to be oriented at 0°, 90°, 180°, or 270°, the system achieves higher memory density while maintaining proper signal timing through the additional spatial dimension
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.