Modular Flip-Flop Cell Layout With Shared Clock Chaining
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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 configurations, allowing for the assembly of multi-bit flip-flops with varied voltage thresholds, provides flexibility and reduces the complexity and cost of designing multi-bit flip-flop circuits by using standard layout cells from a library.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard cell libraries are used for multi-bit flip-flop design, then design process is simplified, but flexibility and customization capability are reduced
Solution Approach 1:
The multi-bit flip-flop is segmented into multiple independent single-bit flip-flop cells, each capable of being individually configured with different voltage thresholds. This segmentation allows the design process to use standardized single-bit cell structures while enabling customization through selective configuration of each segment's voltage threshold characteristics.
2Device complexity
If pre-defined multi-bit cell types are used, then design complexity is reduced, but cost increases due to redefinition requirements
Solution Approach 1:
A universal single-bit flip-flop cell design is created that can serve multiple functions by configuring different voltage thresholds for different bits in a multi-bit flip-flop. This universal cell type eliminates the need to create and maintain multiple specialized multi-bit cell types, reducing both design complexity and the costs associated with redefining pre-defined cell types for different configurations.
3Adaptability or versatility
If single-bit flip-flop cells with shared clock signals are used, then flexibility and customization are improved, but device complexity increases
Solution Approach 1:
Multiple single-bit flip-flop cells are merged into a single multi-bit flip-flop structure by sharing common clock signal pathways and control logic. This merging approach maintains the flexibility and customization capability of individual single-bit cells while reducing overall circuit complexity through resource sharing, eliminating the need for separate clock distribution networks for each bit.
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.