Mixed-Height IC Cell Columns and Interface Taps
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Solution Overview
Problem
Integrated circuits (ICs) face challenges in achieving both high integration and performance, as existing designs struggle to optimize area and operating speed effectively, particularly in balancing the requirements between high-density and high-performance cells.
Innovation Solution
The design incorporates columns of cells with different heights and pitches, along with an interface column for efficient interfacing, allowing for a mixed-column block structure that optimizes area and performance by aligning high-density and high-performance cells in specific configurations and using pre-placement cells for efficient power and voltage distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If cells of different heights are used to optimize performance, then operating speed is improved, but device complexity increases
Solution Approach 1:
The integrated circuit is divided into multiple columns, each containing cells of uniform height. This segmentation allows each column to be optimized independently for specific functions while maintaining overall system performance. The interface column acts as a boundary between different cell height regions, enabling performance optimization without excessive complexity.
Solution Approach 2:
Different columns are assigned different cell heights based on local performance requirements. High-performance columns use taller cells while high-density columns use shorter cells. This local quality approach allows the circuit to achieve high operating speed in critical paths without increasing complexity across the entire device.
2Speed
If high-performance cells are used to increase operating speed, then speed is improved, but area increases reducing integration level
Solution Approach 1:
The circuit is segmented into high-performance columns with taller cells and high-density columns with shorter cells. This allows the high-performance cells to occupy only the necessary area for critical functions, while the majority of the circuit uses compact short cells to maximize integration density.
Solution Approach 2:
The cell height parameter is varied across different columns to balance performance and area. By changing the cell height parameter locally rather than uniformly across the entire circuit, the design achieves high operating speed in critical paths while maintaining high integration level overall through optimized area utilization.
3Area of stationary object
If high-density cells are used to increase integration level, then area is reduced, but operating speed decreases
Solution Approach 1:
Different columns are designed with different cell characteristics tailored to their specific functional requirements. Columns requiring high speed use taller cells with optimized timing, while columns requiring high density use shorter cells. This local quality differentiation allows the circuit to achieve both high integration and high performance in appropriate locations.
Solution Approach 2:
The design transitions from a uniform two-dimensional cell layout to a three-dimensional approach by varying cell heights across different columns. This dimensional change allows short cells to provide high density in non-critical areas while tall cells provide high performance in critical paths, effectively resolving the speed-density tradeoff through spatial differentiation.
Data Source
AI summary
An integrated circuit includes a first column including a plurality of first cells aligned and placed in a plurality of first rows, each first row having a first width and extending in a first horizontal direction, a second column including a plurality of second cells aligned and placed in a plurality of second rows, each second row having a second width and extending in the first horizontal direction, and an interface column extending in a second horizontal direction perpendicular to the first horizontal direction between the first column and the second column, wherein the interface column includes at least one well tap configured to provide a first supply voltage to a well, and at least one substrate tap configured to provide a second supply voltage to a substrate.