Point Diffusion Clock Distribution for Low Power and Skew
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Solution Overview
Problem
Conventional clock distribution networks face challenges in balancing high-speed performance with low power consumption, as mesh networks have high power consumption, H-type networks are vulnerable to environmental changes, and serpentine networks are difficult to arrange and prone to transmission line effects.
Innovation Solution
A point diffusion signal distribution system divides an area into regions with signal points and diffusion points, where the signal is initially applied at a center point and transmitted via short, symmetric paths to minimize power consumption and maximize speed, using a design that adapts to even or odd numbered regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If mesh type clock distribution network is used, then signal skew is minimized and high-speed performance is achieved, but power consumption becomes excessively high
Solution Approach 1:
The invention divides the clock distribution network into multiple hierarchical levels: top-level clock trees that cover large areas and bottom-level clock trees that serve local regions. This segmentation allows the system to achieve high-speed performance through optimized local distribution while reducing overall power consumption by limiting the distribution distance of high-power clock signals.
Solution Approach 2:
The invention implements different clock distribution strategies for different regions of the chip. Top-level clocks serve global regions with long distribution paths, while bottom-level clocks serve local regions with short distribution paths. This local optimization ensures that each region receives clock signals with appropriate characteristics for its specific requirements, achieving high-speed performance where needed while minimizing power consumption in other areas.
2Use of energy by moving object
If H type or serpentine clock tree network is used, then power consumption is reduced, but the network becomes vulnerable to environmental variations and transmission line effects
Solution Approach 1:
By dividing the clock distribution into top-level and bottom-level hierarchical structures, the invention creates multiple redundant paths for clock signal distribution. This segmentation ensures that if environmental variations affect one path, other paths can maintain reliable operation, thereby improving overall system reliability while keeping power consumption low through efficient local distribution.
Solution Approach 2:
The invention incorporates compensation mechanisms that anticipate and counteract environmental variations before they significantly impact performance. By designing the hierarchical clock tree structure with appropriate buffering and synchronization elements at each level, the system pre-compensates for potential variations in pressure, temperature, and voltage, ensuring stable operation under varying environmental conditions.
3Use of energy by moving object
If H type or serpentine clock tree network is used, then power consumption is reduced, but load arrangement becomes difficult
Solution Approach 1:
The hierarchical division into top-level and bottom-level clock trees creates flexible modules that can be independently configured. The bottom-level clock trees can be strategically placed near load clusters, allowing loads to be arranged in practical designs without being constrained by rigid H-type or serpentine patterns. This segmentation makes load arrangement easier while maintaining low power consumption through localized distribution.
Solution Approach 2:
The invention allows different regions of the chip to have customized bottom-level clock tree configurations optimized for their specific load requirements. This local flexibility enables loads to be arranged according to functional requirements rather than being forced into predetermined patterns, significantly easing the manufacturing and design process while maintaining efficient power distribution.
4Reliability
If conventional clock distribution networks are used, then signal distribution is achieved, but signal skew increases and power consumption rises
Solution Approach 1:
By dividing the clock distribution into hierarchical levels with synchronized timing, the invention ensures that signal skew is minimized at each level. The top-level clocks provide synchronized start times for multiple bottom-level clocks, and each bottom-level clock tree is optimized for minimal skew within its region. This segmented approach achieves reliable signal distribution across the entire chip while keeping signal skew low through localized optimization.
Solution Approach 2:
The invention implements preliminary synchronization at the top-level clock distribution stage, establishing precise timing references before signals are distributed to bottom-level clocks. This preliminary action ensures that all subsequent clock distributions are time-aligned, preventing cumulative skew from developing across the chip and maintaining low signal skew throughout the hierarchical structure.
Data Source
AI summary
For distributing a signal to loads in an area, the area is divided into a plurality of regions. A respective signal point is disposed in each region for providing the signal to a load in the region. A respective diffusion point is disposed between any two neighboring signal points. The signal is initially applied to a center point of the signal and diffusion points. The signal when received at a given signal or diffusion point is transmitted to any of the signal or diffusion points within a maximum distance from the given signal or diffusion point.