Clock Tree Balancing in Multi-Voltage Digital Systems
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Solution Overview
Problem
In multi-voltage synchronous digital systems, clock tree latencies are affected by voltage variations, leading to imbalanced clock trees and potential timing violations across clock domains due to independent, varying voltages sourcing multiple clock trees.
Innovation Solution
A method and system that utilize a clock management unit to generate clock signals for both adaptive and non-adaptive voltage domains, employing mirrored clock trees and controllable buffers to ensure equivalent delays across different voltage domains, with level shifters and a delay controller for fine-tuning, allowing clock signals to be synchronized without timing violations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple clock trees are sourced by independent, varying voltages to enable multi-voltage operation, then adaptability to different voltage domains is improved, but clock tree latency balance deteriorates
Solution Approach 1:
A delay controller is introduced as an intermediary component between the voltage domains and clock trees. This delay controller dynamically adjusts the delay of clock signals in real-time to compensate for voltage-induced latency variations, thereby maintaining clock tree balance while allowing independent voltage operation in different domains
Solution Approach 2:
The system transitions from static clock distribution to dynamic clock tree balancing. The delay controller continuously monitors and adjusts clock signal delays based on real-time voltage conditions, enabling the clock trees to adapt dynamically to voltage variations and maintain synchronization across multi-voltage domains
2Use of energy by moving object
If clock trees operate with independent voltage variations to enable flexible voltage scaling, then energy efficiency is improved, but timing violation risk increases
Solution Approach 1:
A feedback mechanism is implemented where the delay controller receives information about voltage variations and clock signal delays, then adjusts the delay elements accordingly. This closed-loop feedback system ensures that timing violations are prevented while allowing voltage domains to operate independently for energy efficiency
Data Source
AI summary
A method for balancing clock trees in a multi-voltage synchronous digital environment is provided that includes generating a first source clock signal in a first voltage domain based on a first mirrored clock signal in a second voltage domain. Similarly, a second source clock signal is generated in the second voltage domain based on a second mirrored clock signal in the first voltage domain.