Semiconductor I/O Line Overlap for Power Mesh Space
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Solution Overview
Problem
As integration density increases in semiconductor integrated circuits, there is a challenge in securing space for power mesh lines due to the close arrangement of I/O signal lines, leading to difficulties in allocating sufficient space for their formation.
Innovation Solution
The semiconductor integrated circuit apparatus rearranges local I/O lines and segment I/O lines to overlap each other, allowing power mesh lines to be placed in previously unused spaces, thereby optimizing the layout and improving power mesh characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If I/O signal lines are arranged with minimum critical dimension to increase integration density, then integration density is improved, but space for power mesh lines deteriorates
Solution Approach 1:
The patent applies three-dimensional stacking by forming upper and lower segment I/O lines that extend in parallel to the first direction at different vertical levels. This dimensional transition allows I/O lines to be arranged both horizontally (between column select lines) and vertically (upper and lower layers), effectively increasing integration density while preserving horizontal space for power mesh lines.
Solution Approach 2:
The patent implements nested arrangement where upper segment I/O lines are positioned directly above lower segment I/O lines in the vertical direction, creating a compact stacked structure. This nesting approach maximizes space utilization by placing conductive lines in the vertical dimension rather than consuming additional horizontal area.
2Adaptability or versatility
If more I/O signal lines are allocated to meet increasing integration requirements, then functionality is improved, but available space deteriorates
Solution Approach 1:
The patent extends I/O signal line capacity by utilizing the vertical dimension through upper and lower segment I/O lines. This allows the system to accommodate more I/O signal lines without increasing the horizontal footprint, thereby maintaining available space while improving adaptability.
Solution Approach 2:
The patent divides segment I/O lines into multiple segments (upper and lower) that can be independently controlled and routed. This segmentation allows flexible allocation of I/O capacity across different vertical levels, enabling the system to meet increasing functionality requirements while maintaining compact horizontal arrangement.
Data Source
AI summary
A semiconductor integrated circuit apparatus includes: a plurality of column select signal lines extended in parallel to each other with a predetermined distance provided therebetween; a local I/O line arranged in a selected space among spaces formed between the respective column select signal lines; and an upper segment I/O line arranged to overlap the local I/O line and a local I/O line bar.