Modular Flip-Flop Cell Layout With Shared Clock Abutment
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Solution Overview
Problem
Current electronic design automation (EDA) tools face challenges in efficiently designing and optimizing multi-bit flip-flop circuits due to limitations in standard cell libraries, which often require complex and costly redefinition of multi-bit flip-flop cell types based on factors like bit count and voltage thresholds.
Innovation Solution
The implementation of single-bit flip-flop cells with shared clock signals and modular design allows for the assembly of multi-bit flip-flops with varying voltage thresholds, enabling flexible and efficient creation of multi-bit flip-flop circuits from standard cell libraries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-bit flip-flop cell types are defined in standard cell libraries based on bit count and voltage thresholds, then customization capability is improved, but device complexity and design costs increase
Solution Approach 1:
The multi-bit flip-flop is segmented into multiple independent single-bit flip-flop cells, each capable of operating independently with its own voltage threshold. This segmentation allows customization through selective assembly rather than requiring pre-defined multi-bit cell types, thereby reducing design complexity while maintaining adaptability.
Solution Approach 2:
A universal single-bit flip-flop cell design is created that can be reused multiple times to construct flip-flops of any bit width and voltage threshold configuration. This universal cell serves multiple functions by being instantiated repeatedly with different voltage threshold assignments, eliminating the need for separate specialized cell types for each configuration.
2Adaptability or versatility
If multiple single-bit flip-flop cells are assembled to form multi-bit flip-flops, then adaptability is improved, but device area increases
Solution Approach 1:
Adjacent single-bit flip-flop cells are merged by sharing common clock signal pathways and control logic structures. This merging reduces redundant circuitry between cells, allowing multi-bit flip-flops to be constructed with less total area than the sum of independent cells would require, while maintaining flexible voltage threshold configurations.
3Productivity
If standard cell libraries include pre-defined multi-bit flip-flop cell types, then design productivity is improved, but manufacturing precision and cost control worsen
Solution Approach 1:
Each single-bit flip-flop cell within the multi-bit structure can be assigned a specific voltage threshold characteristic tailored to local requirements. This local quality approach allows precise control over voltage thresholds for individual cells or groups of cells, enabling fine-grained optimization of noise margins and signal levels in different regions of the circuit without compromising overall design productivity.
Data Source
AI summary
An integrated circuit includes a semiconductor substrate and a plurality of circuit elements in or on the substrate. The circuit elements are defined by standard layout cells selected from a cell library. The circuit elements including a plurality of flip-flops. Each flip-flop has a data input terminal, a data output terminal, a clock input terminal, and a clock output terminal. A first one of the flip-flops directly abuts a second flip-flop such that the clock output terminal of the first flip-flop electrically connects with the clock input terminal of the second flip-flop.