Clock Trigger Synchronization Across Asynchronous Clock Domains
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Solution Overview
Problem
Computing devices with multiple clock frequencies face challenges in synchronizing activity across different circuits, particularly when switching frequencies to conserve power, leading to issues like jitter and undesired output pulses.
Innovation Solution
A system that manages clock trigger signals across multiple clock domains by deriving a base clock signal from a first clock domain and generating a second clock trigger signal based on a main clock of a second domain, using multiplexers and synchronizer circuitry to select and synchronize frequencies for peripherals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If different clock frequencies are used for different components to balance performance and energy efficiency, then power consumption is optimized and performance is improved, but synchronization difficulties and jitter increase across circuits
Solution Approach 1:
A synchronizer circuit is introduced as an intermediary component between clock domains with different frequencies. The synchronizer receives clock signals from a first clock domain and generates synchronized clock signals for a second clock domain, thereby mediating the synchronization problem while allowing different components to operate at optimized frequencies for power and performance
Solution Approach 2:
The system employs feedback mechanisms where the synchronizer continuously monitors and adjusts clock signal timing across domains. By detecting phase differences and jitter between clock domains and dynamically adjusting synchronization parameters, the system maintains reliable timing relationships despite frequency variations and power management transitions
2Use of energy by moving object
If clock frequencies are switched to conserve power resources, then energy efficiency is improved, but jitter and undesired output pulses occur
Solution Approach 1:
The synchronizer circuit is configured to anticipate and prepare for clock frequency transitions before they occur. By pre-synchronizing clock signals and preparing synchronization parameters in advance of power management transitions, the system minimizes jitter and prevents undesired output pulses when clock frequencies are switched for power conservation
Solution Approach 2:
The synchronizer implements cushioning mechanisms that absorb and dampen the effects of abrupt clock frequency changes. By incorporating synchronization buffers and transition-smoothing logic, the system cushions against the destabilizing effects of frequency switching, maintaining stable clock signals during power management operations
3Adaptability or versatility
If multiple clock domains operate independently at different frequencies, then adaptability and performance optimization are improved, but device complexity increases
Solution Approach 1:
The synchronizer circuit is designed as a universal component that can handle multiple clock frequency combinations and synchronization scenarios. By implementing a multi-functional synchronization architecture that can adapt to various first and second clock domain frequency pairs, the system enables frequency flexibility across clock domains while avoiding the need for separate dedicated synchronization circuits for each frequency combination, thereby limiting the increase in device complexity
Data Source
AI summary
Embodiments disclosed herein relate to managing clock signals across clock domains. In one implementation, a system is configured to derive a base clock signal from a first clock trigger signal produced by a first subsystem in a first clock domain of the clocking system. The system is further configured to generate a second clock trigger signal based on the base clock signal and a main clock of a second subsystem in a second clock domain of the clocking system. The system is also configured to supply the second clock trigger signal to a second peripheral in the second clock domain.